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Journal articles on the topic 'Turbocharger'
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1
Korakianitis, Theodosios, and T. Sadoi. "Turbocharger-Design Effects on Gasoline-Engine Performance." Journal of Engineering for Gas Turbines and Power 127, no. 3 (June 24, 2005): 525–30. http://dx.doi.org/10.1115/1.1808428.
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Specification of a turbocharger for a given engine involves matching the turbocharger performance characteristics with those of the piston engine. Theoretical considerations of matching turbocharger pressure ratio and mass flow with engine mass flow and power permits designers to approach a series of potential turbochargers suitable for the engine. Ultimately, the final choice among several candidate turbochargers is made by tests. In this paper two types of steady-flow experiments are used to match three different turbochargers to an automotive turbocharged-intercooled gasoline engine. The first set of tests measures the steady-flow performance of the compressors and turbines of the three turbochargers. The second set of tests measures the steady-flow design-point and off-design-point engine performance with each turbocharger. The test results show the design-point and off-design-point performance of the overall thermodynamic cycle, and this is used to identify which turbocharger is suitable for different types of engine duties.
2
Tian, Wei, Defeng Du, Juntong Li, Zhiqiang Han, and Wenbin Yu. "Establishment of a Two-Stage Turbocharging System Model and Analysis on Influence Rules of Key Parameters." Energies 13, no. 8 (April 15, 2020): 1953. http://dx.doi.org/10.3390/en13081953.
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This paper took a two-stage turbocharged heavy-duty six-cylinder diesel engine as the research object and established a two-stage turbocharging system matching model. The influence rules between the two-stage turbocharging key parameters were analyzed, while summarizing an optimization method of key parameters of a two-stage turbocharger. The constraint equations for the optimal distribution principle of the two-stage turbocharger’s pressure ratio and expansion ratio were proposed. The results show that when the pressure ratio constraint equation and expansion ratio constraint equation are satisfied, the diesel engine can achieve the target pressure ratio, while the total energy consumption of the turbocharger is the lowest.
3
Alshammari, Mamdouh, Nikolaos Xypolitas, and Apostolos Pesyridis. "Modelling of Electrically-Assisted Turbocharger Compressor Performance." Energies 12, no. 6 (March 13, 2019): 975. http://dx.doi.org/10.3390/en12060975.
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For the purposes of design of a turbocharger centrifugal compressor, a one-dimensional modelling method has been developed and applied specifically to electrically-assisted turbochargers (EAT). For this purpose, a mix of authoritative loss models was applied to determine the compressor losses. Furthermore, an engine equipped with an electrically-assisted turbocharger was modelled using commercial engine simulation software (GT-Power) to assess the performance of the engine equipped with the designed compressor. A commercial 1.5 L gasoline, in-line, 3-cylinder engine was selected for modeling. In addition, the simulations have been performed for an engine speed range between 1000 and 5000 rpm. The design target was an electric turbocharger compressor that could meet the boosting requirements of the engine with noticeable improvement in a transient response. The results from the simulations indicated that the EAT improved the overall performance of the engine when compared to the equivalent conventional turbocharged engine model. Moreover, the electrically-assisted turbochargers (EAT) equipped engine with power outputs of 1 kW and 5 kW EAT was increased by an average of 5.96% and 15.4%, respectively. This ranged from 1000 rpm to 3000 rpm engine speed. For the EAT model of 1 kW and 5 kW, the overall net reduction of the BSFC was 0.53% and 1.45%, respectively, from the initial baseline engine model.
4
Fang, Yan Kai, and Limin Chen. "Performance Analysis on Electrical Aided Turbocharged System." Applied Mechanics and Materials 34-35 (October 2010): 1946–50. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1946.
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A turbocharger is fitted to a diesel in order to enhance the inlet charge pressure, hence increasing the fresh air in the cylinder, then more fuel can be injected into the cylinder and sequentially more engine power can put out. The electrical aided turbocharged system is a mechanism adding a high speed electronic motor into a turbocharger shaft. The electronic motor can work as a motor to drive the turbocharger shaft and as a generator to generate electricity energy to storage energy. According to certain constraint conditions, the controlling strategy of the hybrid turbocharged system is presented. The simulation results about key work points reveal that controlling the turbocharged engine following the strategy can enhance the engine performance.
5
Dasappa, S., H. V. Sridhar, and I. Muzumdar. "Experiments on and thermodynamic analysis of a turbocharged engine with producer gas as fuel." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 4 (September 23, 2011): 1004–15. http://dx.doi.org/10.1177/0954406211419063.
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This article presents the studies conducted on turbocharged producer gas engines designed originally for natural gas (NG) as the fuel. Producer gas, whose properties like stoichiometric ratio, calorific value, laminar flame speed, adiabatic flame temperature, and related parameters that differ from those of NG, is used as the fuel. Two engines having similar turbochargers are evaluated for performance. Detailed measurements on the mass flowrates of fuel and air, pressures and temperatures at various locations on the turbocharger were carried out. On both the engines, the pressure ratio across the compressor was measured to be 1.40 ± 0.05 and the density ratio to be 1.35 ± 0.05 across the turbocharger with after-cooler. Thermodynamic analysis of the data on both the engines suggests a compressor efficiency of 70 per cent. The specific energy consumption at the peak load is found to be 13.1 MJ/kWh with producer gas as the fuel. Compared with the naturally aspirated mode, the mass flow and the peak load in the turbocharged after-cooled condition increased by 35 per cent and 30 per cent, respectively. The pressure ratios obtained with the use of NG and producer gas are compared with corrected mass flow on the compressor map.
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Stolyarov, A. S. "Improving convergence of solving system of equations of matching of turbocharger and engine characteristic maps." Transactions of the Krylov State Research Centre S-I, no. 1 (December 8, 2021): 100–102. http://dx.doi.org/10.24937/2542-2324-2021-1-s-i-100-102.
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The analysis of the relationship between the parameters of the operating point of the engine and the turbocharger is carried out in this article. The calculation method of matching of turbocharger and engine characteristic maps is proposed. The developed method makes it possible to calculate the operating point of a turbocharged diesel engine with simple iterations. The results of the work are useful for matching of turbocharger and engine characteristic maps.
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Galiev, Ilgiz, Ekaterina Parlyuk, and Bulat Ziganshin. "MODERNIZATION OF THE LUBRICATION SYSTEM OF THE TURBOCHARGER BEARING OF THE DIESEL ENGINE." Vestnik of Kazan State Agrarian University 16, no. 3 (November 21, 2021): 67–71. http://dx.doi.org/10.12737/2073-0462-2021-67-71.
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The problem of increasing the unit power of the engine without making changes to its design is solve by using a turbo supercharger. However, due to the intensity of the turbochargers operating mode, which are characterized by engine speed variability due to changing load indicators during operation (the number of rotor revolutions varies from 30000 min-1 to 120000 min-1, engine exhaust gases have a temperature of about 7500C), there is a need to improve the efficiency of the turbocharger bearing lubrication system. The purpose of the research is to ensure the operability and increase the reliability of turbochargers of diesel engines. To achieve this goal, a constructive solution for the lubrication system of the bearing assembly was propose, i.e., a membrane-type hydraulic accumulator was structurally provided in the lubrication system of the bearing assembly. Experimental studies were conduct to identify the operability and effectiveness of this constructive solution. The experiment was carried out on the KAMAZ-740 engine, the turbocharger shaft drive was carried out in normal mode, that is, from exhaust gases. L-02-40 fuel was use, SAE 10W–40 API was use as a lubricant. The turbocharger shaft speed varied from minimum to maximum by changing the engine speed and then stopping it. During the experiments, the following parameters of the turbocharger operation were measure: the duration of inertial rotation of the turbocharger rotor; the duration of pressure reduction in the turbocharger lubrication system. The dependences of the influence of the duration of the pressure drop in the turbocharger lubrication system and the duration of rotation of the turbocharger shaft by inertia with parallel inclusion of the accumulator in its lubrication system and in the normal mode of lubrication of the bearing are reveal. It is established that the installation of a device for feeding the turbocharger bearing during a sharp reduction in engine speed will increase the run-out of the turbocharger rotor from 30 to 65 s while maintaining the normal operating mode of the turbocharger lubrication system
8
Alaviyoun, Seyed Shahabeddin, and Masoud Ziabasharhagh. "Experimental thermal survey of automotive turbocharger." International Journal of Engine Research 21, no. 5 (June 13, 2018): 766–80. http://dx.doi.org/10.1177/1468087418778987.
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Turbochargers are commonly used in the automotive industry due to their ability to increase the specific power output of internal combustion engines. Heat transfer from the turbine to the compressor can strongly influence the turbocharger performance. Therefore, it is essential to consider heat transfer properties of the turbochargers. Existing heat transfer models are generally limited to the specific situations on the turbocharger test rig or the engine test bench, which are different to the real conditions of engine operation in a vehicle. Accurate modeling and calculation of the heat transfer require a more precise measurement study. In this research, we evaluate the temperature distribution of the turbocharger walls using an engine test bench and also a vehicle that are both equipped with the same instrumented turbocharger. Thermocouple measurements and thermography pictures were used to determine the temperature distributions of the turbocharger. Different heat transfer phenomena of turbocharger have been measured and analyzed. In addition, the effect of heat transfer on compressor efficiency is investigated. Several tests have been conducted, including a vehicle on a flat surface and also during an uphill climb with a trailer load hitched. The results of vehicle warm-up test show that the compressor housing has a higher temperature gradient in comparison with the engine test bench. The velocity of the air around the turbocharger is a factor that contributed toward the differences between an engine test bench and typical vehicle conditions.
9
Flaxington, D., and E. Swain. "Turbocharger aerodynamic design." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 213, no. 1 (January 1, 1999): 43–57. http://dx.doi.org/10.1243/0954406991522176.
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The aerodynamic design of turbochargers is described, covering radial compressors and turbines and also axial turbines. The paper concentrates upon those aspects that are peculiar to turbocharger design, including the approach adopted, and highlights the importance of company-specific empirical data. Turbochargers have to be physically adaptable to suit many different sizes of engine, with a great variety of operating duties. The need for turbochargers to achieve the highest obtainable performance at the lowest cost while maintaining durability levels comparable with the engine contributes to the design challenges that are discussed.
10
Li, Bin, and Shou Jun Zhang. "MV “CRYSTAL STAR” Diesel Turbocharger Surge Cause Analysis and Troubleshooting." Applied Mechanics and Materials 672-674 (October 2014): 1562–67. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1562.
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Currently shipping costs are increasing sharply due to the rising oil prices. In order to reduce shipping costs, most low-speed two-stroke diesel engines run at low speeds to reduce fuel oil consumption, and this measure might result turbocharger surge. For modern marine diesel engines, the exhaust gas turbochargers are becoming more and more important; their working conditions have a direct impact on the performance of diesel engines, consequently affecting the operation of the ship. Surge will fail a turbocharger to achieve the supercharging ratio, damage the turbocharger components and even lead to a damage accident of the whole turbocharger. Therefore, a good understanding of the reasons for marine diesel engine turbocharger surge will help to prevent and eliminate turbocharger surge in operation. This paper is to make an analysis on the special surge mechanism occurred to the turbocharger on MV "Crystal Star", and propose some appropriate supervisory and preventive measures against the problem.
11
Sass, Péter. "Literature Research on Experimental Investigations of Automotive Turbocharger Rotordynamics." Acta Technica Jaurinensis 12, no. 4 (October 18, 2019): 268–93. http://dx.doi.org/10.14513/actatechjaur.v12.n4.498.
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Contemporary turbochargers are high-speed rotating devices, commonly supported by full floating bearings or semi-floating bearings. Depending on the size and operational speed of the turbocharger, rotordynamics significantly changes. Industrial turbochargers are operating below 20.000 RPM and their rotor weight is substantial, leading to quasilinear rotordynamics behaviour. By contrast, automotive turbochargers are rotating up to 300.000 RPM with non-linear rotordynamics characteristics. Due to this non-linearity, rotor movement is intense, and bearing load is dynamically changing all the time. The consequence is reduced lifespan of the turbocharger. In this paper, the effect of changing bearing clearances, as well as the differences between semi-floating and full floating bearing constructions will be described based on journal papers scientific publications on the topic. Also, the damping and whirling phenomenon inside a bearing system will be investigated and presented in a comprehensive literature research on automotive turbocharger rotordynamics.
12
Wang, Shi Juan. "T-145 Turbocharger Product Identification and Research Organizations." Applied Mechanics and Materials 488-489 (January 2014): 877–80. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.877.
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T-145 turbocharger for 170 series turbocharged diesel engine supporting one type of supercharger. Product quality system certification involves turbocharger manufacturing quality and use of quality aspects. Production of quality products , including the product design quality , production organization , quality parts , components and standard parts supply , assembly quality. Use quality turbocharger can be achieved in the course of the performance indicators.These indicators are in the laboratory by the engine manufacturer turbocharger performance test data . User Quality is the key to life test booster . On the client problems is to charge by the turbocharger manufacturer . The same is the product acceptable identification of the content . Turbocharger product certification process is the production quality system certification. Also Turbocharger Manufacturing and production certification. Access system in the implementation of the product after the turbocharger manufacturer 's products to meet the requirements of industry management standards , but also meet the requirements of the engine plant . Therefore, a product required after the completion of the trial process through the identification . Used to determine the level of products .
13
Yin, Sheng, Jimin Ni, Houchuan Fan, Xiuyong Shi, and Rong Huang. "Study on Correction Method of Internal Joint Operation Curve Based on Unsteady Flow." Applied Sciences 12, no. 23 (November 23, 2022): 11943. http://dx.doi.org/10.3390/app122311943.
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The turbocharger, a key component in a vehicle’s powertrain, results in insufficient accuracy if it does not fully consider the unsteady flow effects of the intake and exhaust systems. Based on the difference between the turbocharger’s actual operating performance with unsteady flow and the corresponding steady flow performance, unsteady flow correction concepts and correction methods for the compressor and turbine were put forward, and the correction of the internal joint operation curve was investigated. The results show that when unsteady correction coefficients were added to both ends of the turbocharger and the optimized structure was used at both ends, the original turbocharger’s surge margin was reduced by 4.6% to 11.8%, and that of the optimized turbocharger was reduced by 15.2% to 21.9% in the medium–low-speed range. Meanwhile, the unsteady flow energy utilization coefficient of the optimized turbocharger was more than 14.5% higher than that of the original turbocharger in the medium–low speed range, and the energy utilization advantage was obvious. It indicated that the optimized turbocharger was working earlier, and the engine’s medium–low-speed admission performance has been obviously improved. Therefore, compared with the steady curve, the corrected unsteady curve was closer to the actual engine performance.
14
Galimov, Aynur, Ilgiz Galiev, Bulat Ziganshin, Rail Khusainov, and Al'bert Muhametshin. "THE RESULTS OF THE STUDY OF THE INFLUENCE OF THE OPERATING CONDITIONS OF THE TURBOCHARGER ON ITS PERFORMANCE." Vestnik of Kazan State Agrarian University 16, no. 2 (August 5, 2021): 70–74. http://dx.doi.org/10.12737/2073-0462-2021-70-74.
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The operability of the bearing assembly, which ensures the operation of the turbocharger at different speeds of its rotor, determines the reliability of the turbocharger as a whole. In this regard, the condition of the turbocharger bearing assembly determines the performance of the entire turbocharger. The purpose of the research is to justify the parameter that determines the performance of the turbocharger and a comparative assessment of changes in the state of turbochargers with a standard lubrication system and when using individual bearing assembly lubrication systems. The main factors affecting the state of the turbocharger bearing assembly, and hence the length of the rotor rotation by inertia after the engine stops, are considered to be: the increase in the clearance in the bearing assembly, the speed of rotation of the turbocharger rotor before the engine stops, and the time of pressure drop in the bearing assembly to zero after the engine stops. To obtain dependences describing the effect of the gap in the turbocharger bearing, the time of pressure drop in its lubrication system after the engine stops, and the change in the duration of rotation of the turbocharger rotor by inertia in dynamics, we conducted experimental studies. The experiment involved vehicles with a standard lubrication system and with an individual lubrication system for the turbocharger bearing assembly. The data was sample along the main diagonal of the matrix of experimental indicators. The dependences of the effect of the gap and the time of pressure drop in the bearing assembly on the duration of rotation of the rotor of the turbocharger by inertia after stopping the engine, at the speed of rotation of the rotor before stopping the engine 10000, 25000 and 40000 min-1 are obtained. A comparative analysis of this indicator is given for turbochargers with a standard and individual lubrication system of the bearing assembly, which shows that the duration of rotation of the rotor by inertia increases from 45 s (standard lubrication mode) to 90 s (with an individual lubrication system). This gives us reason to believe that the wear rate of the bearing will decrease by half during operation
15
Tauzia, X., J. F. Hetet, P. Chesse, G. Crosshans, and L. Mouillard. "Computer aided study of the transient performances of a highly rated sequentially turbocharged marine diesel engine." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 212, no. 3 (May 1, 1998): 185–96. http://dx.doi.org/10.1243/0957650981536853.
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The sequential turbocharging technique described in this paper leads to an improvement in the operations of highly rated diesel engines, in particular at part loads (better air admission). However, transient phases such as a switch from one turbocharger to two turbochargers can be difficult, mainly because of the inertia of the turbochargers. In order to simulate the dynamics of turbocharged diesel engines, the SELENDIA software has been extended. When applied to two different engines (12 and 16 cylinders), the program shows good agreement with the experimental data. Moreover, the compressor surge has been investigated during faulty switch processes. The software has then been used for predictive studies to evaluate the possibility of adapting sequential turbocharging to a 20-cylinder engine and to calibrate the optimum switching conditions (air and gas valve opening timing).
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Adamkiewicz, Andrzej, and Piotr Nikończuk. "An attempt at applying machine learning in diagnosing marine ship engine turbochargers." Eksploatacja i Niezawodnosc - Maintenance and Reliability 24, no. 4 (November 9, 2022): 795–804. http://dx.doi.org/10.17531/ein.2022.4.19.
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The article presents a diagnosis of turbochargers in the supercharging systems of marine engines in terms of maintenance decisions. The efficiency of turbocharger rotating machines was defined. The operating parameters of turbocharging systems used to monitor the correct operation and diagnose turbochargers were identified. A parametric diagnostic test was performed. Relationships between parameters for use in machine learning were selected. Their credibility was confirmed by the results of the parametric test of the turbocharger system and the main engine, verified by the coefficient of determination. A particularly good fit of the describing functions was confirmed. As determinants of the technical condition of a turbocharger, the relationship between the rotational speed of the engine shaft, the turbocharger rotor assembly and the charging air pressure was assumed. In the process of machine learning, relationships were created between the rotational speed of the engine shaft and the boost pressure, and the indicator of the need for maintenance. The accuracy of the maintenance decisions was confirmed by trends in changes in the efficiency of compressors.
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Justin Dhiraviam, F., V. Naveen Prabhu, T. Suresh, and C. Selva Senthil Prabhu. "Improved Efficiency in Engine Cooling System by Repositioning of Turbo Inter Cooler." Applied Mechanics and Materials 787 (August 2015): 792–96. http://dx.doi.org/10.4028/www.scientific.net/amm.787.792.
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Turbochargers are an integral part of today’s modern diesel engines and are a major reason that they are able to produce more power. Unlike a super charger that is driven via a belt from the engine, a turbo takes the exhaust that the engine is producing and puts it to good use. As Turbochargers are driven by exhaust, heat is an unwelcome by product and something that wasn’t really taken into account in automobiles. Then those intercoolers started to come into play in turbocharged automobiles. The forced air produced by the turbocharger is routed through the intercooler where its temperature is reduced before reaching the engine. The use of intercoolers has made turbocharged vehicles far more reliable and, in the case of today’s heavy duty diesel trucks, is a very important component. The inlet air of an IC engine from turbocharger temperature is very much high (due to compression) means oxygen content is very much less. And also air with high temperature causes pre-ignition and detonation. So fuel combustion does not take place properly. Inter Cooling of inlet air is very much essential according to performance point of view. Turbo intercoolers are used for cooling the inlet air of an IC engine from turbo chargers. Moreover cooling of air makes it denser and contributes for better combustion and more power they are mounted close to the radiators for achieving lower air temperature. This arrangement affects the performance of both. So in this project an attempt will be made to increase the efficiency of the turbo intercooler arrangement through design modification and repositioning of intercooler by taking the TATA MARCOPOLO-Star Bus 909 as a reference.
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Machado, Luiz Henrique Jorge, Oscar Ricardo Sandoval, José Victor Matos Carvalho Pereira, Juliana Primo Basílio de Souza, Bryan Castro Caetano, Vítor Mourão Hanriot, Fabrício José Pacheco Pujatti, and Marco Tulio Correa de Faria. "Influence of Fluid Film Bearings with Different Axial Groove Shapes on Automotive Turbochargers: An Experimental Study." Lubricants 10, no. 5 (May 11, 2022): 92. http://dx.doi.org/10.3390/lubricants10050092.
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Most commercial automotive turbochargers (TC) employ semi-floating ring bearings (SFRB) with axial groove shapes. In order to bring some insights into the role played by the axial groove geometry on the dynamics of TC, this work deals with an experimental study of the rotordynamic behavior of a stock automotive turbocharger operating on SFRB with two different groove shapes, which have the same volume and width, and with the same number of grooves. The rotating machine behavior has been evaluated under different operating conditions using a test bench specially designed to analyze turbochargers. Rotordynamic (RD) characteristics of automotive turbochargers are estimated to evaluate the influence of the axial groove geometry on the machine vibratory behavior. Frequency spectra and orbital plots of the rotor are obtained from accelerometers and proximity probes mounted on the turbocharger. The comparative analysis of the vibrational behavior of automotive turbochargers running on different supporting systems allows the identification of the role played by the axial grooves on the machine rotordynamic performance. The experimental results rendered in this work permit to classify the influence of the axial groove geometry on the turbocharger rotordynamic behavior for several speed and flow conditions.
19
Chiriac, Rareș-Lucian, Anghel Chiru, Răzvan Gabriel Boboc, and Ulf Kurella. "Advanced Engine Technologies for Turbochargers Solutions." Applied Sciences 11, no. 21 (October 27, 2021): 10075. http://dx.doi.org/10.3390/app112110075.
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Research in the process of internal combustion engines shows that their efficiency can be increased through several technical and functional solutions. One of these is turbocharging. For certain engine operating modes, the available energy of the turbine can also be used to drive an electricity generator. The purpose of this paper is to highlight the possibilities and limitations of this solution. For this purpose, several investigations were carried out in the virtual environment with the AMESim program, as well as experimental research on a diesel engine for automobiles and on a stand for testing turbochargers (Turbo Test Pro produced by CIMAT). The article also includes a comparative study between the power and torque of the naturally aspirated internal combustion engine and equipped with a hybrid turbocharger. The results showed that the turbocharger has a very high operating potential and can be coupled with a generator without decreasing the efficiency of the turbocharger or the internal combustion engine. The main result was the generation of electrical power of 115 W at a turbocharger shaft speed of 140,000–160,000 rpm with an electric generator shaft speed of 14,000–16,000 rpm. There are many constructive solutions for electrical turbochargers with the generator positioned between the compressor and the turbine wheel. This paper is presenting a solution of a hybrid turbocharger with the generator positioned and coupled with the compressor wheel on the exterior side.
20
Katrašnik, Tomaž, Ferdinand Trenc, Vladimir Medica, and Stojan Markič. "An Analysis of Turbocharged Diesel Engine Dynamic Response Improvement by Electric Assisting Systems." Journal of Engineering for Gas Turbines and Power 127, no. 4 (July 23, 2004): 918–26. http://dx.doi.org/10.1115/1.1924533.
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It is well known that turbocharged diesel engines suffer from an inadequate response to sudden load increase, this being a consequence of the nature of the energy exchange between the engine and the turbocharger. The dynamic response of turbocharged diesel engines could be improved by electric assisting systems, either by direct energy supply with an integrated starter-generator-booster (ISG) mounted on the engine flywheel, or indirect energy supply with an electrically assisted turbocharger. A previously verified zero dimensional computer simulation method was used for the analysis of both types of electrical assistance. The credibility of the data presented is further assured by the experimentally determined characteristics of the electric motors used as input parameters of the simulation. The paper offers an analysis of the interaction between a turbocharged diesel engine operating under various load conditions and electric assisting systems, as well as the requirements for supporting electric motors suitable for the improvement of an engine’s dynamic response. It is evident that an electrically assisted turbocharger outperforms an integrated starter-generator-booster for vehicle application, however ISG is the preferred solution when instant power increase is demanded.
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Özgür, Tayfun, and Kadir Aydın. "Analysis of Engine Performance Parameters of Electrically Assisted Turbocharged Diesel Engine." Applied Mechanics and Materials 799-800 (October 2015): 861–64. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.861.
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Charging system is used to increase the charge density. Supercharging system suffers from fuel consumption penalty because of compressor powered by engine output. Turbocharging system uses wasted exhaust energy that means compressor powered by exhaust turbine but has a turbo lag problem. The electrically assisted turbocharger which can eliminate turbo lag problem and fuel consumption penalty is the topic of this paper. The purpose of this paper is to analyze the effect of electrically assisted turbocharger on diesel engine performance parameters. The AVL Boost software program was used to simulate the electrically assisted turbocharged diesel engine. Simulations results showed that electrically assisted turbocharger increases low end torque and improves fuel economy.
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Zhang, Ji, and Kenong Xia. "TiAl Turbochargers for Automobile Application." Materials Science Forum 618-619 (April 2009): 559–62. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.559.
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A textured microstructure was produced in the TiAl turbocharger blades and platelike TiAl samples in the process of conventional casting, in which the lamellar orientation is parallel to the plate surfaces. A microstructure design specific to the turbocharger blades was therefore proposed based on the preponderance in tensile properties, creep rupture life and creep resistance along the preferential lamellar orientation. The mechanical capacity of the TiAl turbochargers has been validated through endurance tests.
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Serrano, José R., Pablo Olmeda, Francisco J. Arnau, and Vishnu Samala. "A holistic methodology to correct heat transfer and bearing friction losses from hot turbocharger maps in order to obtain adiabatic efficiency of the turbomachinery." International Journal of Engine Research 21, no. 8 (March 14, 2019): 1314–35. http://dx.doi.org/10.1177/1468087419834194.
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Turbocharger performance maps provided by manufacturers are usually far from the assumption of reproducing the isentropic performance. The reason being, those maps are usually measured using a hot gas stand. The definition of the effective turbocharger efficiency maps include the mechanical losses and heat transfer that has occurred during the gas stand test for the turbine maps and only the heat transfer for the compressor maps. Thus, a turbocharger engine model that uses these maps provides accurate results only when simulating turbocharger operative conditions similar to those at which the maps are recorded. However, for some critical situations such as Worldwide harmonized Light vehicles Test Cycles (WLTC) driving cycle or off-design conditions, it is difficult to ensure this assumption. In this article, an internal and external heat transfer model combined with mechanical losses model, both previously developed and calibrated, has been used as an original tool to ascertain a calculation procedure to obtain adiabatic maps from diabatic standard turbocharger maps. The turbocharger working operative conditions at the time of map measurements and geometrical information of the turbocharger are necessary to discount both effects precisely. However, the maps from turbocharger manufacturers do not include all required information. These create additional challenges to develop the procedure to obtain approximated adiabatic maps making some assumptions based on SAE standards for non-available data. A sensitivity study has been included in this article to check the validity of the hypothesis proposed by changing the values of parameters which are not included in the map data. The proposed procedure becomes a valuable tool either for Original Equipment Manufacturers (OEMs) to parameterize turbocharger performance accurately for benchmarking and turbocharged engine design or to turbocharger manufacturers to provide much-appreciated information of their performance maps.
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Wang, Zhihui, Chaochen Ma, Zhi Huang, Liyong Huang, Xiang Liu, and Zhihong Wang. "A novel variable geometry turbine achieved by elastically restrained nozzle guide vanes." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, no. 9 (April 8, 2020): 2312–29. http://dx.doi.org/10.1177/0954407020909662.
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Variable geometry turbocharging is one of the most significant matching methods between turbocharger and engine, and has been proven to provide air boost for entire engine speed range as well as to reduce turbo-lag. An elastically constrained device designed for a novel variable geometry turbocharger was presented in this paper. The design of the device is based on the nozzle vane’s self-adaptation under interactions of the elastic force by elastically restrained guide vane and the aerodynamic force from flowing gas. The vane rotation mechanism of the novel variable geometry turbocharger is different from regular commercial variable geometry turbocharger systems, which is achieved by an active control system (e.g. actuator). To predict the aerodynamic performance of the novel variable geometry turbocharger, the flow field of the turbine was simulated using transient computational fluid dynamics software combined with a fluid–structure interaction method. The results show that the function of elastically constrained device has similar effectiveness as the traditional variable geometry turbocharger. In addition, the efficiency of the novel variable geometry turbocharger is improved at most operating conditions. Furthermore, a turbocharged diesel engine was created using the AVL BOOST software to evaluate the benefits of the new variable geometry turbocharger. The proposed novel variable geometry turbocharger can effectively improve the engine performance at mid-high speeds, such that the maximum decrease of brake-specific fuel consumption reaches 17.91% under 100% load and 3600 r/min engine condition. However, the engine power and brake-specific fuel consumption decrease significantly at low engine speed conditions, and the decrease is more than 26% under 1000 r/min.
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Shaaban, S., and J. Seume. "Impact of Turbocharger Non-Adiabatic Operation on Engine Volumetric Efficiency and Turbo Lag." International Journal of Rotating Machinery 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/625453.
Full textAbstract:
Turbocharger performance significantly affects the thermodynamic properties of the working fluid at engine boundaries and hence engine performance. Heat transfer takes place under all circumstances during turbocharger operation. This heat transfer affects the power produced by the turbine, the power consumed by the compressor, and the engine volumetric efficiency. Therefore, non-adiabatic turbocharger performance can restrict the engine charging process and hence engine performance. The present research work investigates the effect of turbocharger non-adiabatic performance on the engine charging process and turbo lag. Two passenger car turbochargers are experimentally and theoretically investigated. The effect of turbine casing insulation is also explored. The present investigation shows that thermal energy is transferred to the compressor under all circumstances. At high rotational speeds, thermal energy is first transferred to the compressor and latter from the compressor to the ambient. Therefore, the compressor appears to be “adiabatic” at high rotational speeds despite the complex heat transfer processes inside the compressor. A tangible effect of turbocharger non-adiabatic performance on the charging process is identified at turbocharger part load operation. The turbine power is the most affected operating parameter, followed by the engine volumetric efficiency. Insulating the turbine is recommended for reducing the turbine size and the turbo lag.
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Roy, Badal Dev, and R. Saravanan. "Experimental Evaluation of Turbo-Matching Appropriateness of B60J67, B60J68, A58N70 and A58N72 Turbo-Chargers for a Commercial Vehicle Engine." International Journal of Emerging Research in Management and Technology 6, no. 11 (June 13, 2018): 71. http://dx.doi.org/10.23956/ijermt.v6i11.49.
Full textAbstract:
The Turbocharger is a charge booster for internal combustion engines to ensure best engine performance at all speeds and road conditions especially at the higher load. Random selection of turbocharger may lead to negative effects like surge and choke in the breathing of the engine. Appropriate selection or match of the turbocharger (Turbomatching) is a tedious task and expensive. But perfect match gives many distinguished advantages and it is a one time task per the engine kind. This study focuses to match the turbocharger to desired engine by simulation and on road test. The objective of work is to find the appropriateness of matching of turbochargers with trim 67 (B60J67), trim 68 (B60J68), trim 70 (A58N70) and trim 72 (A58N72) for the TATA 497 TCIC -BS III engine. In the road-test (data-logger method) the road routes like highway and slope up were considered for evaluation. The operating conditions with respect various speeds, routes and simulated outputs were compared with the help of compressor map.
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Варбанець, Роман Анатолійович, Валентин Григорович Клименко, Дмитро Степанович Мінчев, Віталій Іванович Залож, Владислав Іванович Кирнац, and Надія Ігорівна Александровська. "ДІАГНОСТИКА ТУРБОКОМПРЕСОРА ДИЗЕЛЬНОГО ДВИГУНА ЗА ДОПОМОГОЮ АНАЛІЗУ ВІБРОАКУСТИЧНОГО СПЕКТРУ." Aerospace technic and technology, no. 6 (November 27, 2020): 24–33. http://dx.doi.org/10.32620/aktt.2020.6.03.
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The method considered in the article consists in the analysis of the vibroacoustic signal generated by the compressor of the gas turbocharger during the operation of the diesel engine under load. Spectral analysis shows that the compressor blades generate vibrations that are always present in the spectrum of the general vibration of a gas turbocharger, regardless of its technical condition. The "blade" harmonic in the spectrum corresponding to these oscillations is determined using the method of limitations. The then calculated instantaneous rotor speed of the turbocharger makes it possible to analyze the amplitude of the fundamental harmonic in the spectrum. For numerical analysis of the amplitude of the fundamental harmonic, the power leakage of the discrete spectrum is eliminated. Further analysis of the amplitude of the fundamental harmonic makes it possible to quickly assess the level of vibration of the rotor during operation. The first part of the experiment was carried out on a ship's main diesel engine 5S60MC at a crankshaft speed of 85 min-1. The recording and analysis of vibroacoustic signals from the TCA 66-20072 turbocharger was carried out. The analysis showed the possibility of highly accurate determination of the rotational speed and the relative amplitude of the turbocharger shaft oscillations. The second part of the experiment was carried out on an experimental stand, which is based on a KamAZ-740.10 engine with an original pressurization system. A turbocharger of the TKR-11 type is used as a pressurization unit. As a result of the experiment, it was shown that the method of diagnosing the operation of a turbocharger, which is based on the analysis of a vibroacoustic signal, can be extended not only to turbochargers of low-speed engines, but also to turbochargers of high-speed diesel engines. In this case, the spectrum of the measured signal contains harmonics, the frequencies of which make it possible to determine the crankshaft rotation frequency. It is also shown that measuring the signal outside the compressor, close to its casing, makes it possible to obtain all the necessary diagnostic parameters as accurately as when measuring the signal directly at the inlet to the compressor wheel. The method can be used in practice. To implement it, a smartphone and a computer with special software are enough. The proposed method can be used as the basis for a system for continuous monitoring of the frequency and vibration level of a marine diesel engine turbocharger.
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Becze, Sigismund, and Gheorghe Ioan Vuscan. "Comparison study between two types of nozzles for a turbocharger balancing machine using ANSYS software." MATEC Web of Conferences 299 (2019): 04007. http://dx.doi.org/10.1051/matecconf/201929904007.
Full textAbstract:
Turbocharger balancing machines require a specific tooling for spinning the center housing rotating assembly, in order to balance it dynamically. The tooling requires a nozzle to guide the air to the blades of the turbine wheel in order to spin it. Depending on the type of nozzle chosen, the maximum rotational speed achieved and the acceleration curve can be different. In today?s market there is anincreasing demand for a higher turbocharger speed, generally driven by the demand for engine downsizing and for a higher performance. Due to that, turbochargers need to be better balanced, thus requiring a wider measurement range of the unbalanced in order to see how the part performs in all its working range. Consequently, the nozzles used by turbocharger balancing machines need to be verified at a higher speed limit.
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Burciu, Salvadore Mugurel, and Kristina Uzuneanu. "Response Time to Sudden Changes in Speed and Load Regimes for Turbocharged Diesel Engine." Applied Mechanics and Materials 659 (October 2014): 157–62. http://dx.doi.org/10.4028/www.scientific.net/amm.659.157.
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The paper includes results from experimental determinations of parameters for turbocharged MB836Db diesel engine, which functioning at dynamic conditions. The studied functioning modes resulting from sudden changes in acceleration and/or loading. The authors used for experimental determinations an railway Diesel engine turbocharged, MB836Db. The results are obtained based on measurements made in the department of Thermal Systems and Environmental Engineering from University “Dunarea de Jos” of Galati. Authors used the equipment which contains PLC module CBM 500, which is put on the turbocharged MB836Db engine. Experimental measurements were performed for dynamic regimes (regimes varying in time) , in case of four changes for engine's acceleration and load.In conditions of acceleration (fast increase of rotation and/or load) only one part of exhaust gasses's energy is transformed in mechanical work for turbocompressor; the rest of the energy is used for the acceleration of different parts which are in rotation movement, to overcome the inertia of the turbocharger with free rotation. That is why, the pressure delivered by the turbocharger in case of functioning on unsteady conditions, at any moment is decreased than the supercharger pressure in steady working conditions, at the same speed and load regimes.The experimental results obtained for unsteady working conditions shows that the performances of engine and turbocompressor are reduced compared to the performances in stationary operating conditions, and this because the turbocompressor inertia is greater than the inertia of the injection system. Because of this issue is modified significantly the combustible mixture quality (decrease in the ratio of air and fuel ), which determines the increase of chemical pollution and decrease of engine performances.The authors presents some conclusions on the influence of the turbocharger’s response on the performances of engine in case of regimes varying in time, such as changes in acceleration and load.
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Kazemi Bakhshmand, Sina, Ly Tai Luu, and Clemens Biet. "Experimental Energy and Exergy Analysis of an Automotive Turbocharger Using a Novel Power-Based Approach." Energies 14, no. 20 (October 13, 2021): 6572. http://dx.doi.org/10.3390/en14206572.
Full textAbstract:
The performance of turbochargers is heavily influenced by heat transfer. Conventional investigations are commonly performed under adiabatic assumptions and are based on the first law of thermodynamics, which is insufficient for perceiving the aerothermodynamic performance of turbochargers. This study aims to experimentally investigate the non-adiabatic performance of an automotive turbocharger turbine through energy and exergy analysis, considering heat transfer impacts. It is achieved based on experimental measurements and by implementing a novel innovative power-based approach to extract the amount of heat transfer. The turbocharger is measured on a hot gas test bench in both diabatic and adiabatic conditions. Consequently, by carrying out energy and exergy balances, the amount of lost available work due to heat transfer and internal irreversibilities within the turbine is quantified. The study allows researchers to achieve a deep understanding of the impacts of heat transfer on the aerothermodynamic performance of turbochargers, considering both the first and second laws of thermodynamics.
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Chapman, G. M., and X. Wang. "Interpretation of Experimental and Theoretical Data for Prediction of Mode Shapes of Vibrating Turbocharger Blades." Journal of Vibration and Acoustics 110, no. 1 (January 1, 1988): 53–58. http://dx.doi.org/10.1115/1.3269480.
Full textAbstract:
The blading in large turbochargers is subjected to vibration excitation originating from pulsations in the exhaust gas stream coupled with the blade pass frequencies. The amplitude of vibrations induced are a source of concern to design engineers as they can seriously affect the operation of the turbocharger. This paper discusses theoretical and experimental investigations aimed at identifying the natural frequencies and the associated mode shapes for a single turbocharger blade. Modal Analysis, Electronic Speckle Pattern Interferometry (ESPI), and Finite Element Analysis are all used in an attempt to categorize the modal patterns.
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Deng, Qiyou, Andrew Pennycott, Qingning Zhang, Calogero Avola, Ludek Pohorelsky, and Richard Burke. "Dimensionless quantification of small radial turbine transient performance." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 235, no. 1 (August 8, 2020): 188–98. http://dx.doi.org/10.1177/0954407020942035.
Full textAbstract:
Turbochargers are inherently dynamic devices, comprising internal flow volumes, mechanical inertias and thermal masses. When operating under transient conditions within an engine system, these dynamics need to be better understood. In this paper, a new non-dimensional modelling approach to characterise the turbocharger is proposed. Two new dimensionless quantities are defined with respect to mechanical and thermal transient behaviour, which are used in conjunction with the Strouhal number for flow transients. The modelling approach is applied to a small wastegated turbocharger and validated against experimental results. The model is used to simulate the turbocharger mass flow rate, turbine housing temperature and shaft speed responses to different excitation frequencies for different sizes of turbine. The results highlight the influence of turbocharger size on the dynamic behaviour of the system, which is particularly marked for the turbine housing temperature. At certain frequency ranges, the system behaviour is quasi-steady, allowing modelling through static maps in these operating regions. Outside these ranges, however, transient elements play a more important role. The simulation study shows that the proposed dimensionless parameters can be used to normalise the influence of turbine size on the dynamic response characteristics of the system. The model and corresponding dimensionless parameters can be applied in future simulation studies as well as for turbocharger matching in industry.
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Krokhta, G. M., E. N. Khomchenko, and N. A. Usatykh. "Impact of turbocharging on the startability of diesel engines in winter." Traktory i sel hozmashiny 83, no. 4 (April 15, 2016): 28–33. http://dx.doi.org/10.17816/0321-4443-66141.
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The article explores the startability of diesel engine with and without turbocharger under cold conditions. It is known that under subzero temperatures typical for many regions of Russia, the startability of diesel engines is significantly deteriorated. The aim of research is to study the impact of supercharger on startability of diesel engines. In the process of experimental researches by means of light-beam oscillograph, the indices characterizing the starting sequence have been received, namely: rotational frequencies of crankshaft and turbocharger rotor, air output, time of starting, cylinder pressure. It is found that the startability of engine with supercharger conforms to the state standard requirements at the temperature of 8 degrees C below zero, whereas the startability of engine without supercharger conforms to these requirements at 12 degrees C below zero. The starting time of turbocharged engine is extended due to the resistance in inlet line, that leads to increase of inlet manifold vacuum, to decrease of final compression pressure and therefore to decrease of maximum cylinder pressure. The article determines the operation modes of turbocharger at the starting time and at post-launch warm-up. It is found that operating in these modes leads to the shortage of oil in turbocharger bearing under cold conditions. The research has shown that turbocharger mounted on the engine causes the significant reducing of delivery ratio, and therefore the deterioration of startability. Sustainable startability is possible with installation of circulation valve on engine inlet manifold or compressor, and also with use of turbocharger that can be switched off. It is found that turbocharger can operate in the mode of oil starvation at the beginning of post-launch warm-up under cold conditions. In order to reduce the wear of sleeve-shaft coupling, it is recommended to change the current scheme of oil filling or the design of turbocharger to provide oil inlet directly to turbocharger bearings in the moment of starter switching-on.
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Boretti, Albert. "Super Turbocharging the Direct Injection Diesel engine." Nonlinear Engineering 7, no. 1 (March 26, 2018): 17–27. http://dx.doi.org/10.1515/nleng-2017-0067.
Full textAbstract:
Abstract The steady operation of a turbocharged diesel direct injection (TDI) engine featuring a variable speed ratio mechanism linking the turbocharger shaft to the crankshaft is modelled in the present study. Key parameters of the variable speed ratio mechanism are range of speed ratios, efficiency and inertia, in addition to the ability to control relative speed and flow of power. The device receives energy from, or delivers energy to, the crankshaft or the turbocharger. In addition to the pistons of the internal combustion engine (ICE), also the turbocharger thus contributes to the total mechanical power output of the engine. The energy supply from the crankshaft is mostly needed during sharp accelerations to avoid turbo-lag, and to boost torque at low speeds. At low speeds, the maximum torque is drastically improved, radically expanding the load range. Additionally, moving closer to the points of operation of a balanced turbocharger, it is also possible to improve both the efficiency η, defined as the ratio of the piston crankshaft power to the fuel flow power, and the total efficiency η*, defined as the ratio of piston crankshaft power augmented of the power from the turbocharger shaft to the fuel flow power, even if of a minimal extent. The energy supply to the crankshaft is possible mostly at high speeds and high loads, where otherwise the turbine could have been waste gated, and during decelerations. The use of the energy at the turbine otherwise waste gated translates in improvements of the total fuel conversion efficiency η* more than the efficiency η. Much smaller improvements are obtained for the maximum torque, yet again moving closer to the points of operation of a balanced turbocharger. Adopting a much larger turbocharger (target displacement x speed 30% larger than a conventional turbocharger), better torque outputs and fuel conversion efficiencies η* and η are possible at every speed vs. the engine with a smaller, balanced turbocharger. This result motivates further studies of the mechanism that may considerably benefit traditional powertrains based on diesel engines.
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Liu, Ya Ru, Qi Ming Cui, and Hui Bin Li. "Experimental Study on the Noise of Turbocharger." Applied Mechanics and Materials 741 (March 2015): 401–4. http://dx.doi.org/10.4028/www.scientific.net/amm.741.401.
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Based on the experiments on noise and vibration of turbocharger, useful information of these signals were extracted. It is found that the noise distribution, loudness, axial vibration and other information could be used to monitor the turbocharger’s quality.
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Panting, J., K. R. Pullen, and R. F. Martinez-Botas. "Turbocharger motor-generator for improvement of transient performance in an internal combustion engine." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 215, no. 3 (March 1, 2001): 369–83. http://dx.doi.org/10.1243/0954407011525700.
Full textAbstract:
Turbocharging of internal combustion engines is an established technology used for the purpose of increasing both power density and in some cases the cycle efficiency of diesel engines relative to naturally aspirated engines. However, one significant drawback is the inability to match the characteristics of the turbocharger to the engine under full load and also to provide sufficiently good transient response. Under many conditions this results in reduced efficiency and leads to higher exhaust emissions. The design of turbocharger components must be compromised in order to minimize these drawbacks throughout the entire operating range. However, when shaft power can be either added to or subtracted from the turbocharger shaft by means of a direct drive motor-generator, an additional degree of freedom is available to the designer to achieve a better turbocharger-engine matching. Both engine efficiency and transient response can be significantly improved by means of this method, normally described as hybrid turbocharging. This paper describes the results of a theoretical study of the benefits of hybrid turbocharging over a basic turbocharged engine in both steady state and transient operation. The new system and its benefits are described and four different engine-turbocharger systems are analysed in addition to the baseline engine. The main conclusion of the paper is that a significant increase in design point cycle efficiency can be afforded by re-matching the turbocharger components under steady state conditions while at the same time improving full throttle transient performance. Emissions are not considered in this paper.
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Gu, Can song, Zhao cheng Yuan, Zheng rui Yang, Jia xin Liu, and Hong liang Li. "Dynamic characteristics of high-speed gasoline engine turbocharger based on thermo-elasto-hydrodynamic lubrication bearing model and flexible multibody dynamics method." Science Progress 103, no. 1 (January 2020): 003685041989771. http://dx.doi.org/10.1177/0036850419897712.
Full textAbstract:
A flexible multibody dynamic calculation model based on thermo-elasto-hydrodynamic lubrication bearing model was established. This numerical simulation method provided a more realistic turbocharger calculation model and a more reliable theoretical support for studying the dynamic vibration characteristics of the floating ring bearing turbocharger system. In order to fully consider the dynamic characteristics of each component, the behavior of the floating ring bearing was described by generalized incompressible Reynolds equation in thermo-elasto-hydrodynamic lubrication model. The flexible body substructure models were established by the modal synthesis method. Based on this model, the direct mathematical model of the relationship between the eccentricity of the rotor and the oil film clearance on the turbocharger’s surface vibration was established. The influence of eccentricity and oil film thickness on the surface vibration of the turbocharger body was calculated by transient dynamics method. The results showed that the eccentricity of the rotor and the vibration of turbocharger housing were monotonic functions, but the interaction between the whirl of internal and external oil films made the mechanism of the influence of the oil film thickness on the turbocharger body’s vibration complicated. The research provided a new idea for the structural vibration and synchronous noise control of the supercharger.
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Ammad ud Din, Syed, Weilin Zhuge, Panpan Song, and Yangjun Zhang. "A method of turbocharger design optimization for a diesel engine with exhaust gas recirculation." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 10 (October 11, 2018): 2572–84. http://dx.doi.org/10.1177/0954407018802560.
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Downsizing a diesel engine using turbocharger and coupling it with exhaust gas recirculation is the recent trend to improve engine performance and emission control. For diesel engines, it is important to match a turbocharger that meets both the low-speed torque and high-speed power requirements. This article presents a method of turbocharger design optimization for a turbocharged diesel engine equipped with exhaust gas recirculation, on the basis of parametric study of turbocharger geometry. Turbocharger through-flow model along with one-dimensional engine model is used to study the effect of key geometric parameters of the compressor and turbine on engine brake torque, brake-specific fuel consumption, air flowrate and cylinder peak temperature. For compressor, the research emphasizes on impeller inlet relative diameter, inlet blade tip angle, impeller exit blade angle and exit blade height, while for turbine parameters such as volute throat area, inlet blade height, inlet diameter, outlet diameter and rotor exit blade angle are taken into account. Results show that in case of compressor, engine performance is sensitive to the inlet relative diameter, inlet blade angle and exit blade angle. In case of turbine, volute throat area, inlet blade height and inlet diameter have vital effect on engine performance. On the basis of results, an optimized turbocharger design is developed. Comparison shows prominent improvement in turbocharger maps and engine performance. Compressor maximum efficiency and pressure ratio are increased from 73% to 77% and 3.166 to 3.305, respectively. Most importantly, the area of compressor maximum efficiency zone is increased considerably. Also turbine efficiency is increased from 71.42% to 76.94%. As a result, engine torque and air flowrate are increased up to 5.26% and 8.31%, respectively, while brake-specific fuel consumption and cylinder peak temperature are decreased up to 5.00% and 4.31%, respectively.
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Shen, Xianqing, Kai Shen, and Zhendong Zhang. "Experimental study on the effect of high-pressure and low-pressure exhaust gas recirculation on gasoline engine and turbocharger." Advances in Mechanical Engineering 10, no. 11 (November 2018): 168781401880960. http://dx.doi.org/10.1177/1687814018809607.
Full textAbstract:
The effects of high-pressure and low-pressure exhaust gas recirculation on engine and turbocharger performance were investigated in a turbocharged gasoline direct injection engine. Some performances, such as engine combustion, fuel consumption, intake and exhaust, and turbocharger operating conditions, were compared at wide open throttle and partial load with the high-pressure and low-pressure exhaust gas recirculation systems. The reasons for these changes are analyzed. The results showed EGR system of gasoline engine could optimize the cylinder combustion, reduce pumping mean effective pressure and lower fuel consumption. Low-pressure exhaust gas recirculation system has higher thermal efficiency than high-pressure exhaust gas recirculation, especially on partial load condition. The main reasons are as follows: more exhaust energy is used by the turbocharger with low-pressure exhaust gas recirculation system, and the lower exhaust gas temperature of engine would optimize the combustion in cylinder.
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Capata, Roberto, and Enrico Sciubba. "Study, Development and Prototyping of a Novel Mild Hybrid Power Train for a City Car: Design of the Turbocharger." Applied Sciences 11, no. 1 (December 29, 2020): 234. http://dx.doi.org/10.3390/app11010234.
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Within a large, state-funded, Italian National Project aimed to test the feasibility of an on-the-road prototype of a mild hybrid city vehicle, one of the tasks was to conceive, design and implement an innovative turbocharger that would allow for some energy recovery. The selected vehicle is propelled by a 3-cylinder, 998 cc turbocharged engine (the 66 kW Mitsubishi-Smart W451). The idea is to implement two types of energy recovery: one via the new turbocharger and one through a standard braking energy recovery (also known as KERS). The study of the former is the object of this paper. The proposed turbocharger configuration consists of mechanically separated, electrically coupled compressor and turbine, possibly mounting only slightly modified commercial equipment to reduce construction costs. This paper reports the results of the calculation of the behavior of the new turbocharging group across the entire engine operating range and describes the preliminary design of the unit. An accurate simulation of a mixed (urban and extra-urban) driving mission demonstrates that a net saving of about 5.6% can be attained by the installation of the novel turbocharger unit.
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Karamanis, N., and R. F. Martinez-Botas. "Mixed-flow turbines for automotive turbochargers: Steady and unsteady performance." International Journal of Engine Research 3, no. 3 (June 1, 2002): 127–38. http://dx.doi.org/10.1243/14680870260189253.
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Turbochargers are finding increasing application to automotive diesel engines as cost effective means for improving their power output and efficiency, and reducing exhaust emissions; these requirements have led to the need for highly loaded turbocharger turbines. A mixed-flow turbine is capable of achieving its peak isen-tropic efficiency at reduced velocity ratios compared to a typical radial inflow turbine; it is therefore possible to improve the turbocharger/engine matching. These turbines differ from the commonly used radial turbines in that the flow approaches the rotor in the non-radial direction; in the extreme a mixed-flow turbine would become an axial machine. The steady and unsteady performances of a mixed-flow turbocharger turbine with a constant blade inlet angle have been investigated. The steady flow results indicated that the mixed-flow turbine obtains a peak efficiency (total-to-static) of 75 per cent at a velocity ratio of 0.61, compared with that of a typical radial-inflow turbine which peaks at a velocity ratio of 0.7. The performance and flow characteristics were found to deviate significantly from the equivalent steady state values commonly used in turbocharger turbine design.
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Sepfitrah. "Analisis Efisiensi Sistem Turbocharger pada Engine PLTMG 20 MW Berdasarkan Konsumsi Udara." Jurnal Surya Teknika 9, no. 2 (December 30, 2022): 487–91. http://dx.doi.org/10.37859/jst.v9i2.4397.
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Turbocharging system efficiency is a comparison between turbocharging efficiency and turbocharger efficiency. This study analyzes the performance of the ABB 140 and TCR 18 turbochargers on two JGS 620 series F111 gas engines for 3000 hours of operation. The analysis will be carried out based on the specific airflow consumption of the JGS 620 series F111 gas engine. The specific air flow consumption is obtained based on calculations, the ABB A140 turbocharger consumes an average of 0.2% more air than the TCR 18 turbocharger. This condition results in a higher output power on engine 2 on average of 2516.84 kW, compared to the output power engine 1 on average of 2402.72 kW. Based on the calculation of the conduction ratio, the average air consumption on engine 2 is less than engine 1 by 0.41%. The turbocharging efficiency value on the turbine engine 2 side is disrupted at 1700 and 2500 hours of operation. This is due to the disturbance on the turbocharger compressor side of the incoming airflow. The efficiency of the turbocharging system on engine 1 has a value of 79.77%, while on engine 2 it is 77.99%.
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Trynov, A. V., and D. G. Sivykh. "DEVELOPMENT OF MEASURES TO INCREASE RELIABILITY TURBOCHARGER BEARING UNIT AUTOTRACTOR DIESEL ENGINE." Internal Combustion Engines, no. 1 (September 7, 2022): 12–21. http://dx.doi.org/10.20998/0419-8719.2022.1.02.
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To increase the reliability of small turbochargers, in particular the bearing unit, it is proposed to use in the automatic mode of local cooling of the bearing with compressed air. The design of the turbocharger with the central case which houses the bearing and to which engine oil from the engine lubrication system is brought under excess pressure is considered. This design is the most common among turbochargers of tractor engines. Forced engine modes can be critical for the bearing, accompanied by fluctuations in the exhaust gas temperature, for example, due to an uncontrolled increase in cyclic supply, a sharp increase in load. Such modes lead to an increase in temperature deformations of the turbine wheel, rotor, reduce the reliability of the turbocharger. Heat dissipation from the rotor through the bearing assembly into the lubrication system is insufficient, additional short-term local cooling is required. The study simulated heat transfer processes in the bearing assembly of a small turbocharger using the developed mathematical model based on the finite element method. To clarify the model, namely the boundary conditions of the thermal conductivity problem, a series of non-motorized experiments with a locally cooled bearing were performed. In the course of non-motorized experiments, the algorithm of the automatic control system operation was worked out, some of its structural elements were selected and tested in practice. Conducted non-motorized experiments and the results of mathematical modeling confirmed the effectiveness of using the system of automatic local cooling of the bearing assembly. These measures increase the reliability of small turbochargers.
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Liu, Xiang Ling, Meng Xiang Liu, and Jin Ke Gong. "The Finite Element Analysis of Gasoline Engine Turbocharger Key Parts." Applied Mechanics and Materials 433-435 (October 2013): 2151–55. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.2151.
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A geometric model and finite element grid model of JQ40A gasoline engine turbocharger were set up based on the CFD software NUMECA. And the stress, deformation and vibration modal analysis on turbocharger’s compressor impeller, turbine and integrated turbine box was carried out by software ANSYS. The result shows that thin blade impeller design, weight reduction design of the turbine is beneficial to reducing the maximum structural stress, deformation and rotation frequency. The integrated design of the exhaust manifold and the turbine housing is helpful to reducing the flow resistance and the vibration frequency, so as to effectively avoid the resonance region, ensure turbocharger’s reliability and make for enhancing aerodynamic performance. Research methods and conclusions which are of important theoretical significance and practical value, provide basis for optimization design of turbocharger.
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Sun, Qi Xin, and Limin Chen. "Research on Transmitting Efficiency of Supercharged Device." Applied Mechanics and Materials 63-64 (June 2011): 237–40. http://dx.doi.org/10.4028/www.scientific.net/amm.63-64.237.
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In recent years, the internal combustion engine has been widely used through technological advances to improve its environmental performance. Mechanical and electrical integration of the engine turbocharging system is based on conventional turbocharging system to increase motor in parallel with the turbocharger and the corresponding reversible energy storage components, so that achieve by adjusting the energy input or output direction and the size of the motor to adjust the exhaust turbocharger operating point and the gas supply function. According to matching requirements of light vehicle diesel engine, the analysis model of exhaust gas energy is obtained through qualitative analysis of exhaust gas energy in turbocharged diesel engine.
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Zhuge, W., Y. Zhang, X. Zheng, M. Yang, and Y. He. "Development of an advanced turbocharger simulation method for cycle simulation of turbocharged internal combustion engines." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 223, no. 5 (May 1, 2009): 661–72. http://dx.doi.org/10.1243/09544070jauto975.
Full textAbstract:
An advanced turbocharger simulation method for engine cycle simulation was developed on the basis of the compressor two-zone flow model and the turbine mean-line flow model. The method can be used for turbocharger and engine integrated design without turbocharger test maps. The sensitivities of the simulation model parameters on turbocharger simulation were analysed to determine the key modelling parameters. The simulation method was validated against turbocharger test data. Results show that the methods can predict the turbocharger performance with a good accuracy, less than 5 per cent error in general for both the compressor and the turbine. In comparison with the map-based extrapolation methods commonly used in engine cycle simulation tools such as GT-POWER®, the turbocharger simulation method showed significant improvement in predictive accuracy to simulate the turbocharger performance, especially in low-flow and low-operating-speed conditions.
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Gjika, Kostandin, Antoine Costeux, Gerry LaRue, and John Wilson. "Ball bearing turbocharger vibration management: application on high speed balancer." Mechanics & Industry 21, no. 6 (2020): 619. http://dx.doi.org/10.1051/meca/2020091.
Full textAbstract:
Today's modern internal combustion engines are increasingly focused on downsizing, high fuel efficiency and low emissions, which requires appropriate design and technology of turbocharger bearing systems. Automotive turbochargers operate faster and with strong engine excitation; vibration management is becoming a challenge and manufacturers are increasingly focusing on the design of low vibration and high-performance balancing technology. This paper discusses the synchronous vibration management of the ball bearing cartridge turbocharger on high-speed balancer and it is a continuation of papers [1–3]. In a first step, the synchronous rotordynamics behavior is identified. A prediction code is developed to calculate the static and dynamic performance of “ball bearing cartridge-squeeze film damper”. The dynamic behavior of balls is modeled by a spring with stiffness calculated from Tedric Harris formulas and the damping is considered null. The squeeze film damper model is derived from the Osborne Reynolds equation for incompressible and synchronous fluid loading; the stiffness and damping coefficients are calculated assuming that the bearing is infinitely short, and the oil film pressure is modeled as a cavitated π film model. The stiffness and damping coefficients are integrated on a rotordynamics code and the bearing loads are calculated by converging with the bearing eccentricity ratio. In a second step, a finite element structural dynamics model is built for the system “turbocharger housing-high speed balancer fixture” and validated by experimental frequency response functions. In the last step, the rotating dynamic bearing loads on the squeeze film damper are coupled with transfer functions and the vibration on the housings is predicted. The vibration response under single and multi-plane unbalances correlates very well with test data from turbocharger unbalance masters. The prediction model allows a thorough understanding of ball bearing turbocharger vibration on a high speed balancer, thus optimizing the dynamic behavior of the “turbocharger-high speed balancer” structural system for better rotordynamics performance identification and selection of the appropriate balancing process at the development stage of the turbocharger.
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Chybowski, Leszek, Andrzej Jakubowski, and Sławomir Żółkiewski. "Analysis of the Relationship between Selected Ship and Propulsion System Characteristics and the Risk of Main Engine Turbocharger Explosion." Journal of Marine Science and Engineering 11, no. 2 (February 5, 2023): 360. http://dx.doi.org/10.3390/jmse11020360.
Full textAbstract:
The scientific aim of this paper is to analyse the topicality of the turbocharger explosions and to attempt to answer the question of whether some technical characteristics of the engine can be perceived as directly connected with the risk of the turbocharger explosion. Moreover, our objective was also to calculate the turbocharger explosion probability. This article presents the results of a quantitative and qualitative analysis of 42 explosions of marine main engine turbochargers occurring between 1977 and 2022. The number of explosions was analysed, and the average and instantaneous frequencies of turbocharger explosions each year were determined. An analysis was performed of the number of explosions with respect to the age and type of ship on which the accident occurred. An analysis of the contribution of different types of main engine to the studied population of explosions was also carried out. Criteria such as the number of strokes, engine speed, type of crank-piston mechanism, cylinder arrangement, engine power per cylinder, and number of cylinders were considered. An analysis was carried out of the disasters that had occurred, considering the contribution of the various engine manufacturers. An integrated distribution of the number of turbocharger explosions by year was presented, considering the engine speed, the maximum continuous rating of the engine, and the engine design. The analysis did not indicate a significant correlation between the type of ship and the number of explosions that occurred. More than half of the analysed population of explosions (median) occurred on vessels no older than 15 years. It is highly likely that engine type does not directly affect the number of turbocharger explosions and the risk of explosions. On the other hand, it is not possible to exclude the influence of the individual characteristics of an engine built to a particular manufacturer’s design on the magnitude of the risk of a turbocharger exploding during engine operation. Considering the number of ships worldwide, the probability of an explosion in a given year on a given ship is not less than 1.61 × 10−7.
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Галиев, Ильгиз, Ilgiz Galiev, Камиль Хафизов, Kamil Khafizov, Фарит Халиуллин, and Farit Khaliullin. "MODERNIZATION THE SYSTEM OF BEARING UNITS LUBRICATION OF A TURBO COMPRESSOR OF THE TRACTOR ENGINE." Vestnik of Kazan State Agrarian University 14, no. 1 (March 30, 2019): 71–76. http://dx.doi.org/10.12737/article_5cceddb77ac7e0.09639673.
Full textAbstract:
A technically acceptable solution to the problem of increasing power is the use of a supercharger (compressor). This means that the air entering the engine is compressed before it enters the combustion chamber, i.e. the compressor provides the necessary amount of air, sufficient for complete combustion of the increased dose of fuel. Consequently, with the previous working volume of the engine combustion chamber and the same revolutions, we get more power, and the use of a turbocharger is a constructive solution to achieve this goal. However, due to the intensity of the operating mode of the turbochargers with a sharp change in the crankshaft rotation speed and load parameters during operation of the equipment (the rotor speed varies from 30,000 min-1 to 120,000 min-1, the exhaust gas temperature reaches 7500C) it requires effective lubrication of its bearings rotor. In this regard, in the lubrication system of the bearing assembly, a hydroaccumulator of membrane type was structurally provided. The article presents a constructive scheme of the connection of the hydroaccumulator in the lubrication system of the bearing pin of the turbocharger, presents photographs of the experimental setup to confirm the effectiveness of this design solution. The experiment was carried out after the engine stopped, operating at maximum, average and minimum crankshaft speeds, and the rundown time of the turbocharger rotor and pressure drop in the lubrication system of the turbocharger bearing assembly were measured from the moment the engine stopped. It was revealed that the installation of a hydroaccumulator in the lubrication system of the bearing assembly of the turbocharger will ensure the oil feed of the bearings with a sharp reduction in crankshaft rotation during engine overloads, which is confirmed by an increase in the overrun of the turbocharger rotor by 30 ... 40%, while the standard flow and oil pressure remain.
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Katrasˇnik, T., S. Rodman, F. Trenc, A. Hribernik, and V. Medica. "Improvement of the Dynamic Characteristic of an Automotive Engine by a Turbocharger Assisted by an Electric Motor." Journal of Engineering for Gas Turbines and Power 125, no. 2 (April 1, 2003): 590–95. http://dx.doi.org/10.1115/1.1563246.
Full textAbstract:
Turbocharging and subsequent charge cooling of the working medium usually causes increase of the mean effective pressure in an automotive diesel engine. Poor performance during the engine load increase is attributed to the nature of energy exchange between the engine and the turbocharger. Filling of the intake and exhaust manifolds, as well as consequent increase of the pressure and acceleration of the rotating components of the turbocharger require a certain period of time. Dynamic performance of the turbocharger can be substantially improved by means of an electric motor attached directly to the turbo shaft. A new concept of asynchronous electric motor with a very thin rotor was applied to support the turbocharger during the transient operation of the engine. The experimental work of matching an electrically assisted turbocharger to an engine is rather expensive; it was therefore decided to determine general characteristic of the electric motor separately through experiments, whereas transient response of the turbocharged and intercooled diesel engine was simulated by a zero-dimensional filling and emptying computer simulation method. A lot of experimentally obtained data and empirical formulae for the compressor, gas turbine, flow coefficients of the engine valves, intercooler, high-pressure fuel pump with the pneumatic control device (LDA), combustion parameters, etc., were applied to overcome deficiency introduced by the zero-dimensional simulation model. As the result a reliable and accurate program compatible with the experimental results in steady and transient engine operation was developed and is presented in the work. Faster transient response, i.e., better load acceptance of the engine was obtained by applying an adequate electric motor to assist the turbocharger; three versions of electric motors with different torque to mass moment of inertia ratios and different operating regimes were introduced in the simulation program to investigate their influence on the transient behavior of the engine.