Статті в журналах: "Modified engine"

1

Zhou, P. L., and Y. Q. Qian. "Development of a modified diesel engine cycle." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 212, no. 2 (February 1, 1998): 145–50. http://dx.doi.org/10.1243/0954407981525867.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This paper presents an investigation of a novel type of diesel engine cycle, an approximate constant pressure cycle. The prototype engine is called the diesel engine with oil cushioned piston (DEOCP). In contrast to conventional engines, the DEOCP has a variable cylinder volume which is controlled automatically by the engine's cylinder pressure. The variable cylinder pressure is achieved by inserting a hydraulic cylinder into the engine's piston rod. The engine cylinder pressure is thus self-controlled and an ideal constant pressure cycle can theoretically be achieved. Computer simulations and engine tests have shown that the DEOCP distinguishes itself with high cycle efficiency, improved low-load performance and good starting ability. A detailed theoretical analysis and test results are presented in the paper, as well as a discussion of existing problems and possible further developments. Development of the diesel engine with oil cushioned piston could break the limit of cycle efficiency of conventional engines, hence opening a new avenue for diesel engine development.

2

Samad, Mohd Abdul, Syed Nawazish Mehdi, and Syed Khader basha. "A Modified Cylinder Block-IC Engine Experimentation." International Journal of Engineering and Advanced Technology 10, no. 3 (February 28, 2021): 6–8. http://dx.doi.org/10.35940/ijeat.b2095.0210321.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In Internal combustion Engines, the adequate cooling plays vital role for proper functioning and enhanced efficiencies. In the present scenario, the demand for Air cooled Engines with higher powers is increasing and hence necessity for Augmented heat transfer through fins. The present work confined to fins mounted on the cylinder block.In the present work, Internal Combustion Engine test rig is used, which consist of 4S, single cylinder, vertical, air cooled, SI Engine with Instrumentation panel, Throttle control mechanism and Electrical Loading system. The performance test on IC engine is carried out for three various configurations of cylinder blocks i.e., 1. Actual cylinder block 2.Cylinder block with triangular profile fins 3. Cylinder block with perforated triangular profile fins. Performance parameters are evaluated, plotted and compared & eventually conclusions are made.

3

Wang, Yiwei, and Xianghua Huang. "Performance Seeking Control of Propfan Engines Based on Modified Cuckoo Search." International Journal of Turbo & Jet-Engines 37, no. 4 (November 18, 2020): 363–70. http://dx.doi.org/10.1515/tjj-2017-0034.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

AbstractPerformance seeking control benefits propfan engine by generating optimal performance in different flight status. It is based on engine model, control model and optimization model. The control scheme of propfan engine is different from those of turbofan engines, for the thrust of propfan engines is mainly produced by propfans. After analysing the control structure of propfan engines, a control scheme for the propfan engine is proposed. The control scheme works well in flight envelope and the simulation results show that the overshoot of power shaft rotation speed is less than 2 % and the settling time is less than 0.9s. Based on this, a control scheme in performance seeking mode is proposed. A Modified Cuckoo Search method, which modifies the search step size and abandonment rate, is applied in the control scheme in maximum thrust mode and minimum fuel flow mode. The control scheme in performance seeking mode can reduce 2 % fuel flow, compared with the control scheme in torque-compensation mode. Performance of the scheme is better than standard Cuckoo Search and Genetic Algorithm.

4

Petukhov, S. A., L. S. Kurmanova, M. P. Erzamaev, D. S. Sazonov, and D. S. Chinchenko. "Improving the Environmental Safety of Transport Engines Using Modified Engine Oil." Ecology and Industry of Russia 24, no. 1 (January 10, 2020): 9–13. http://dx.doi.org/10.18412/1816-0395-2020-1-9-13.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The problems of reducing emissions of harmful substances by transport engines are considered. It has been established that the use of modified engine oil is an effective way to increase the environmental safety of transport engines. The effectiveness of additives to improve the backsize of motor oil and reduce harmful emissions in the exhaust gas was evaluated. Methods for feeding additives are proposed. Technical solutions for the use of additives for transport engines have been developed. Experimental studies are presented to assess the effect of modified engine oil on the environmental safety of an engine.

5

Amit, Mr. "Performance Study of Air Driven Engine Being Modified From Conventional Four Stroke Engine without Cam Modification." International Journal of Engineering and Advanced Technology 10, no. 2 (December 30, 2020): 250–54. http://dx.doi.org/10.35940/ijeat.b2076.1210220.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This research presents a novel mechanism to convert a conventional100-cc four stroke driven engine into a 2 stroke compressed air driven engine without doing any modifications in the cam shaft. This allows for a faster valve operation & also helping the existing engines to be converted into air driven engines with removal of intake and exhaust manifold and also provides a platform to curb the growing menace of air pollution by using the existing old engines to be used as air driven engine. Also, cycle of operation of the Air Engine has been representedon P-V diagram and theoretical efficiency has been calculated which is a function of pressure ratio and temperature, and comes out to be around 80 percent (@ Prr. Ratio of 10& Temp of 550K). Variation of rpm with percentage valve opening is seen at different pressure ratios and the maximum speed of the engine (after doing said modifications and running through compressed air)is observed to be 1573 rpm at a pressure of 9 bar with the developed mechanism for the existing 4 stroke maestro engine.

6

Biernat, Krzysztof, Izabela Samson-Bręk, Zdzisław Chłopek, Marlena Owczuk, and Anna Matuszewska. "Assessment of the Environmental Impact of Using Methane Fuels to Supply Internal Combustion Engines." Energies 14, no. 11 (June 7, 2021): 3356. http://dx.doi.org/10.3390/en14113356.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This research paper studied the environmental impact of using methane fuels for supplying internal combustion engines. Methane fuel types and the methods of their use in internal combustion engines were systematized. The knowledge regarding the environmental impact of using methane fuels for supplying internal combustion engines was analyzed. The authors studied the properties of various internal combustion engines used for different applications (specialized engines of power generators—Liebherr G9512 and MAN E3262 LE212, powered by biogas, engine for road and off-road vehicles—Cummins 6C8.3, in self-ignition, original version powered by diesel fuel, and its modified version—a spark-ignition engine powered by methane fuel) under various operating conditions in approval tests. The sensitivity of the engine properties, especially pollutant emissions, to its operating states were studied. In the case of a Cummins 6C8.3 modified engine, a significant reduction in the pollutant emission owing to the use of methane fuel, relative to the original self-ignition engine, was found. The emission of carbon oxide decreased by approximately 30%, hydrocarbons by approximately 70% and nitrogen oxide by approximately 50%, as well as a particulate matter emission was also eliminated. Specific brake emission of carbon oxide is the most sensitive to the operating states of the engine: 0.324 for a self-ignition engine and 0.264 for a spark-ignition engine, with the least sensitive being specific brake emission of nitrogen oxide: 0.121 for a self-ignition engine and 0.097 for a spark-ignition engine. The specific brake emission of carbon monoxide and hydrocarbons for stationary engines was higher in comparison with both versions of Cummins 6C8.3 engine. However, the emission of nitrogen oxide for stationary engines was lower than for Cummins engines.

7

Lampreia, Suzana, José Requeijo, and Victor Lobo. "Diesel engine vibration monitoring based on a statistical model." MATEC Web of Conferences 211 (2018): 03007. http://dx.doi.org/10.1051/matecconf/201821103007.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

There are various causes for vibrations on diesel engines. The engine vibrations depend not only on the present state of the engine, but also on the fuel quality, the environmental conditions (sea state in the case of shipborne engines), type of casing, other equipment in the vicinity, etc. The engines used for this study are installed aboard a ship, and the main aim is to use modified control charts to assess the condition of the engine and recommend corrective measures when necessary. An important issue to do this correctly is choosing the right places to measure vibration. The collected data is vibration at various engine power levels, measured at various points. The engine’s fault history is taken into consideration, but proved to be almost irrelevant. By using modified control charts, the engine vibrations can be estimated, and faults can be detected and classified so as to take corrective actions. In this study we followed a methodology that is slightly different from our previous work, and achieved good results.

8

Lus, Tomasz. "Application of HFRT Methods to Diagnose the Technical Condition of High-Speed Marine Diesel Engines." Solid State Phenomena 236 (July 2015): 161–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.236.161.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The paper presents problems related to testing of the technical condition of high-speed marine diesel engines that are not equipped with indicated valves, as it is in the case of larger medium-and low-speed marine internal combustion engines. In this case, in assessment of technical condition of engine fuel injection system and valve gear system a vibration signals (in time / angle domain) analysis modified method called HFRT (High Frequency Resonance Technique) can be used. This method indirectly helps also to evaluate the fuel combustion process in the engine cylinders. The paper presents the theoretical basis of a modified HFRT method, physical implementation of the marine diesel engine system’s analyzer used for marine engines testing built at the Institute of Construction and Operation of Ships at Polish Naval Academy (PNA) in Gdynia. The paper also includes a description of the vibration signal processing methodology and examples of measurements made in the ships conditions for a few selected types of engines.

9

Fan, Chen. "Study on Modified Natural Gas Engine Considering NOx Emission." Applied Mechanics and Materials 318 (May 2013): 371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.318.371.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

There was a conflict between NOx emission and engine power of modified natural gas engine. Influence facters of NOx emission and emission characteristics of existing modified engine were studied. Emission and engine power of natural gas engine modified from gasoline and diesel engine were compared. Then some sugesstion are brought out for designing low NOx emission natural gas engine and promote engine power.

10

Ryan, T. W. "Coal-Fueled Diesel Development: A Technical Review." Journal of Engineering for Gas Turbines and Power 116, no. 4 (October 1, 1994): 740–48. http://dx.doi.org/10.1115/1.2906881.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The purpose of this paper is to describe and summarize the results of the Coal Fueled Diesel Engine Development Program, sponsored by the U.S. Department of Energy, Morgantown Energy Technology Center. The results of the program indicate that diesel engines can be designed to operate reliably on coal–water slurries. The engine must be modified to include hard-wear resistant rings and liners. The injection system design must be modified to accommodate the slurry and to incorporate hard materials for wear prevention.

11

Urban, C. M., H. E. Mecredy, T. W. Ryan, M. N. Ingalls, and B. T. Jett. "Coal–Water Slurry Operation in an EMD Diesel Engine." Journal of Engineering for Gas Turbines and Power 110, no. 3 (July 1, 1988): 437–43. http://dx.doi.org/10.1115/1.3240140.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The U.S. Department of Energy, Morgantown Energy Technology Center has assumed a leadership role in the development of coal-burning diesel engines. The motivation for this work is obvious when one considers the magnitude of the domestic reserves of coal and the widespread use of diesel engines. The work reported in this paper represents the preliminary engine experiments leading to the development of a coal-burning, medium-speed diesel engine. The basis of this development effort is a two-stroke, 900 rpm, 216-mm (8.5-in.) bore engine manufactured by Electro-Motive Division of General Motors Corporation. The engine, in a minimally modified form, has been operated for several hours on a slurry of 50 percent (by mass) coal in water. Engine operation was achieved in this configuration using a pilot injection of diesel fuel to ignite the main charge of slurry. A standard unit injector, slightly modified by increasing diametric clearances in the injector pump and nozzle tip, was used to inject the slurry. Under the engine operating conditions evaluated, the combustion efficiency of the coal and the NOx emissions were lower than, and the particulate emissions were higher than, corresponding diesel fuel results. These initial results, achieved without optimizing the system on the coal slurry, demonstrate the potential for utilizing coal slurry fuels.

12

Towoju, Olumide Adewole, Ademola A. Dare, and Samson K. Fashogbon. "Experimental investigation of the performance and emission characteristics of a CI engine equipped with a modified truncated cone piston crown operated on diesel and shea-butter biodiesel." European Journal of Engineering Research and Science 3, no. 10 (October 31, 2018): 126–31. http://dx.doi.org/10.24018/ejers.2018.3.10.954.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Biodiesels and Improved combustion chamber design have better in-cylinder air motion which positioned them to offer increased advantages in addressing the major concern of high emission and low thermal efficiency of compression ignition engines. This study therefore investigated the impact of Shea-butter biodiesel and redesigned combustion chamber on the performance and emission characteristics of a compression ignition engine. Biodiesel was prepared from Shea-butter using the standard process. Experiments were conducted on a Yoshita-165F engine operated on a blend of AGO and Shea-butter biodiesel and then Yoshita-165F engine equipped with a truncated cone piston crown with a cone base-angle of 40° modified from the standard piston, operated on a blend of AGO and Shea-butter to determine the engines’ performance characteristics using a TQ TD115 MKH Absorption Dynamometer. The performance and emission characteristic of the engine witnessed an improvement with the use of the truncated cone piston crown with a cone base-angle of 40°. This was also observed with AGO/Shea-butter biodiesel blend as fuel and was particularly well pronounced when utilized as a fuel for the truncated cone piston crown equipped engine. Compression ignition engine equipped with the modified piston and operated on AGO/Shea-butter biodiesel led to improvement in performance.

13

Merkisz, Jerzy, Maciej Bajerlein, Paweł Daszkiewicz, Łukasz Rymaniak, and Dawid Frąckowiak. "The analysis of thermodynamic indicators in unconventional combustion engine." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (December 31, 2018): 148–51. http://dx.doi.org/10.24136/atest.2018.373.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Results of piston movement simulation in Autodesk Inventor has been used to create simulation of combustion process in AVL Fire. Simulation for both engines has been made for the same boundary conditions. Results of simulations were compared for two versions of Szymkowiak’s engines. Diagrams with comparison of both engines shows better parameters of Szymkowiak’s engine. Modified construction should be optimized to reach similar parameters.

14

Bajerlein, Maciej, Paweł Daszkiewicz, Dawid Frąckowiak, Michał Domański, and Paweł Stobnicki. "Analysis of camshaft control in unconventional combustion engine." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (December 31, 2018): 58–61. http://dx.doi.org/10.24136/atest.2018.354.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

For the simulation there was created model of Szymkowiak’s engine and it’s version with modified swing arm, in Autodesk Inventor. Dynamic simulation of piston movement has been made for both engines with selected compression ratios. Results of piston movement has been used to create simulation of combustion process in AVL Fire. Simulation for both engines has been made for the same boundary conditions.

15

Liu, Yang, Yituan He, Cuijie Han, and Chenheng Yuan. "Combustion and energy distribution of hydrogen-enriched compressed natural gas engines with low heat rejection based on Atkinson cycle." Advances in Mechanical Engineering 11, no. 1 (January 2019): 168781401881958. http://dx.doi.org/10.1177/1687814018819580.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In order to reduce the heat loss and improve the indicated thermal efficiency of hydrogen-enriched compressed natural gas engines, this article presents a combination of Atkinson cycle with high compression ratio and low heat rejection on the hydrogen-enriched compressed natural gas prototype engine with 55% hydrogen blend. The combustion characteristics and energy distribution of the prototype and modified engines were investigated by simulation, and the conclusions are as follows: the pressure and temperature of modified engines are higher than those of the prototype during the combustion process. Compared with the prototype, the modified engines present lower peak heat release rate, but faster combustion after ignition, and their CA50 are closer to top dead center. Although the high compression ratio engine with Atkinson cycle generates more heat loss, its indicated thermal efficiency still increases by 0.6% with the decrease in the exhaust energy. Furthermore, the high compression ratio engine with low heat rejection and Atkinson cycle combines the advantages of low heat loss and relatively longer expansion stroke, so its heat loss reduces obviously, and 61.6% of the saved energy from low heat rejection and Atkinson cycle can be converted into indicated work that indicates a 4.5% improvement in indicated thermal efficiency over the prototype, which makes it perform better in terms of power and fuel economy simultaneously.

16

Rajkumar, T. Dhiliphan, S. P. Raja, and A. Suruliandi. "Users’ Click and Bookmark Based Personalization Using Modified Agglomerative Clustering for Web Search Engine." International Journal on Artificial Intelligence Tools 26, no. 06 (December 2017): 1730002. http://dx.doi.org/10.1142/s0218213017300022.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Short and ambiguous queries are the major problems in search engines which lead to irrelevant information retrieval for the users’ input. The increasing nature of the information on the web also makes various difficulties for the search engine to provide the users needed results. The web search engine experience the ill effects of ambiguity, since the queries are looked at on a rational level rather than the semantic level. In this paper, for improving the performance of search engine as of the users’ interest, personalization is based on the users’ clicks and bookmarking is proposed. Modified agglomerative clustering is used in this work for clustering the results. The experimental results prove that the proposed work scores better precision, recall and F-score.

17

Parthasarathy, M., J. Isaac Joshua Ramesh Lalvani, E. Prakash, S. Jayaraj, and K. Annamalai. "Experimental Investigation on Combustion and Emission Characteristics of Modified Piston in an IDI Diesel Engine Fueled with Ethyl Alcohol." Advanced Materials Research 984-985 (July 2014): 873–77. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.873.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Compression ignition engines with ethyl alcohol as a fuel are associated with some problems. Because of ethyl alcohol has high self-ignition temperature. It can be used in compression engine by hot surface ignition method which is used to resolve the ignition of the fuel. The modification of the engine is carried out in such a way that a pre combustion chamber is designed in engine head with a provision for heat plug is made on the pre combustion chamber. A piston with squish plate is designed and thermally analyzed. The squish piston helps for attaining better homogeneous mixture than conventional piston. Thus the better combustion is obtained with the squish piston resulting with higher adiabatic flame temperature than the conventional piston. When air is inducted into the combustion chamber it is exposed to high temperature. Modifications for pure ethyl alcohol made significant improvement in thermal efficiency, torque and reduction in specific fuel consumption of an engine. The results exhibit a path toward ethyl alcohol has an effective alternative to conventional diesel engines.

18

Ali, Rashid, Anjali Saxena, Richa Gupta, and M. M. Sufyan Beg. "Myriad- a Novel User Feedback Based Metasearch Engine." Advanced Materials Research 433-440 (January 2012): 7554–62. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7554.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Metasearch engine is a system that provides unified access to multiple existing search engines. After the results returned from all used component search engines are collected, the metasearch system merges the results into a single ranked list which is expected to be better than the results of the best of the participating search systems. The success of a metasearch engine depends mainly on their rank aggregation method. The system is a better one, if the aggregated list of results displayed before the user satisfies the user with his information need. In this paper, we discuss the development of a metasearch engine that performs user feedback based metasearching using modified rough set based aggregation. Metasearching using the modified rough set based aggregation is performed in two phases namely the ranking rule learning phase and the rank aggregation phase. For each query in the training set, we mine the ranking rules and select the best rules-set by performing cross-validation test. Once the system is trained, we use the best rule set to get the overall ranking for the results returned from different search systems in response to other queries. We also present few snapshots of our system.

19

Seto, Kazuto, Masao Ishihama, Akio Nagamatsu, and Kazuhiro Doi. "Vibration Control of Engine Roll and Bounce Using Hydraulic Engine Mounts." Journal of Robotics and Mechatronics 7, no. 4 (August 20, 1995): 285–94. http://dx.doi.org/10.20965/jrm.1995.p0285.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This paper shows the optimum design method for hydraulic engine mounts. Engine mounts have been developed recently to significantly reduce the vibration in car bodies caused by engines. The resonance peaks of conventional engine-mounting systems can not be suppressed sufficiently. Hydraulic engine mounts are able to suppress the resonance peaks by using the fluid reaction effect of the fluid enclosed in the mounts. The design was recently modified by trial and error experiments. Due to lack of information on a suitable design, the ability of this design has not been effectively demonstrated. In this paper, after the mount is analyzed, its optimum design formula is obtained in a simple and useful manner, similar to the design equation for dynamic absorbers. This design formula is applied for designing two hydraulic engine mounts to control engine vibrations in the roll and bounce modes. The effectiveness of the formula is confirmed theoretically and experimentally.

20

Sofianopoulos, Aimilios, Mozhgan Rahimi Boldaji, Benjamin Lawler, Sotirios Mamalis, and John E. Dec. "Effect of engine size, speed, and dilution method on thermal stratification of premixed homogeneous charge compression–ignition engines: A large eddy simulation study." International Journal of Engine Research 21, no. 9 (January 15, 2019): 1612–30. http://dx.doi.org/10.1177/1468087418820735.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

High heat release rates limit the operating range of homogeneous charge compression–ignition engines to low and medium loads. Thermal stratification has been shown to stagger autoignition, lower heat release rates, and extend the operating range of homogeneous charge compression–ignition engines. However, the dependence of naturally occurring thermal stratification on the engine size, speed, and internal residual dilution is not fully understood. A three-dimensional computational fluid dynamics model with large eddy simulations and detailed chemical kinetics was developed using CONVERGE. This model was used to simulate two different engines: (1) a light-duty 2.0 GM Ecotec Engine modified for homogeneous charge compression–ignition combustion in one of the cylinders and (2) a medium-duty Cummins B-series engine modified for homogeneous charge compression–ignition combustion in one of the cylinders. For the light-duty engine, five consecutive modeled cycles were compared with experimental data from 300 consecutive cycles using residual gas dilution at 2000 r/min. For the medium-duty engine, five consecutive modeled cycles were compared with experimental data from 100 consecutive cycles using air dilution with intake heating at 1200 r/min. In the light-duty engine, it was found that incomplete mixing between fresh charge and residual gas increased thermal stratification early in the compression stroke for residual dilution compared to air dilution. Residual stratification at the onset of ignition was small and not directly coupled with thermal stratification. Heat losses to the walls were the dominant source of thermal stratification at the onset of ignition. The reduced oxygen concentration due to residual dilution, increased the temperature requirement for autoignition, which increased heat transfer losses and increased the thermal stratification around top dead center. The thermal stratification before ignition reduced when the engine speed increased because of the lower heat transfer losses. The light-duty engine was found to have larger portion of the fuel energy lost to heat transfer than the medium-duty engine, which resulted in larger thermal stratification before ignition.

21

Sathyamurthy, Ravishankar, and S. A. Hari Krishnan. "Investigation on LPG-Biogas Blends in Spark Ignition Engine." International Journal of Engineering Research in Africa 14 (March 2015): 58–62. http://dx.doi.org/10.4028/www.scientific.net/jera.14.58.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Internal combustion engines normally operate with the nonrenewable sources such as petrol and diesel, which are diminishing at a faster rate. To avoid these problem alternative sources of energy must be opted for the operation of internal combustion engines. In this work biogas is selected as an alternative source of energy for the working of internal combustion engines but possess some limitations due to its high auto ignition temperature and high CO2 content in it. To overcome the limitations biogas is blended with LPG at different proportions of 5%, 10%, 15% are done. The modification of the internal combustion engine is performed to convert it into a gas engine and the tests are conducted on the modified engine with different proportions of blending at various loads. Based on the results of the test conducted the performance characteristics are analyzed.

22

Wells, Michael, Michael Kretser, Ben Hazen, and Jeffery Weir. "Modified C-17 taxi procedures: a fuel cost savings exploration." Journal of Defense Analytics and Logistics 4, no. 2 (July 2, 2020): 129–45. http://dx.doi.org/10.1108/jdal-05-2019-0009.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Purpose This study aims to explore the viability of using C-17 reduced-engine taxi procedures from a cost savings and capability perspective. Design/methodology/approach This study model expected engine fuel flow based on the number of operational engines, aircraft gross weight (GW) and average aircraft groundspeed. Using this model, the research executes a cost savings simulation estimating the expected annual savings produced by the proposed taxi methodology. Operational and safety risks are also considered. Findings The results indicate that significant fuel and costs savings are available via the employment of reduced-engine taxi procedures. On an annual basis, the mobility air force has the capacity to save approximately 1.18 million gallons of jet fuel per year ($2.66m in annual fuel costs at current rates) without significant risk to operations. The two-engine taxi methodology has the ability to generate capable taxi thrust for a maximum GW C-17 with nearly zero risks. Research limitations/implications This research was limited to C-17 procedures and efficiency improvements specifically, although it suggests that other military aircraft could benefit from these findings as is evident in the commercial airline industry. Practical implications This research recommends coordination with the original equipment manufacturer to rework checklists and flight manuals, development of a fleet-wide training program and evaluation of future aircraft recapitalization requirements intended to exploit and maximize aircraft surface operation savings. Originality/value If implemented, the proposed changes would benefit the society as government resources could be spent elsewhere and the impact on the environment would be reduced. This research conducted a rigorous analysis of the suitability of implementing a civilian airline’s best practice into US Air Force operations.

23

Spakovszky, Z. S., J. B. Gertz, O. P. Sharma, J. D. Paduano, A. H. Epstein, and E. M. Greitzer. "Influence of Compressor Deterioration on Engine Dynamic Behavior and Transient Stall-Margin." Journal of Turbomachinery 122, no. 3 (February 1, 1999): 477–84. http://dx.doi.org/10.1115/1.1303817.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This paper presents an experimental and analytical investigation of compressor stability assessment during engine transient operation. A two-dimensional, linear, compressible, state-space analysis of stall-inception (Feulner et al., 1996, ASME J. Turbomach., 118, pp. 1–10) was modified to account for engine transients and deterioration, with the latter modeled as increased tip-clearance and flow blockage. Experiments were performed on large commercial aircraft engines in both undeteriorated and deteriorated states. Unsteady measurements of pressure in these test engines during rapid accelerations revealed the growth of pre-stall disturbances, which rotate at rotor speed and at approximately half rotor speed. These disturbances are stronger in deteriorated engines. The model showed that the signal at shaft speed was the first compressible system mode, whose frequency is near shaft speed, excited by geometric nonuniformities. The computed behavior of this mode during throttle transients closely matched engine data. The signal increased in strength as stall was approached and as the engine deteriorated. This work firmly establishes the connection between observed signals in the these engines and first principles stability models. [S0889-504X(00)01603-2]

24

Abdul Hassan, Norhidayah, Nur Azni Ruzi, Nurul Athma Mohd Shukry, Ramadhansyah Putra Jaya, Mohd Rosli Hainin, Nurul Hidayah Mohd Kamaruddin, and Mohd Ezree Abdullah. "Physical properties of bitumen containing diatomite and waste engine oil." Malaysian Journal of Fundamental and Applied Sciences 15, no. 4 (August 25, 2019): 528–31. http://dx.doi.org/10.11113/mjfas.v15n4.1230.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The addition of modifier, either to replace bitumen or as an additive, could potentially improve the performance of conventional bitumen used in road construction. This study characterizes the physical properties of bitumen 80/100 penetration grade modified with diatomite powder and waste engine oil (WEO). Different percentages of WEO i.e. 1%, 2%, and 3%, were added with 1% diatomite to the bitumen. The conventional and modified bitumen samples were tested for penetration, softening point, viscosity, and loss on heating. Results showed that the increase of WEO content, particularly at 3% in the modified bitumen, has softened the bitumen with lower softening point and higher loss on heating than the unmodified sample. In contrast, the diatomite powder has shown potential in reinforcing the bitumen structure at high temperature based on higher viscosity obtained at 165°C compared to conventional bitumen.

25

Qian, Jing, Yakun Guo, Yidong Zou, and Shige Yu. "Hamiltonian Modeling and Structure Modified Control of Diesel Engine." Energies 14, no. 7 (April 5, 2021): 2011. http://dx.doi.org/10.3390/en14072011.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

A diesel engine is a typical dynamic system. In this paper, a dynamics method is proposed to establish the Hamiltonian model of the diesel engine, which solves the main difficulty of constructing a Hamiltonian function under the multi-field coupling condition. Furthermore, the control method of Hamiltonian model structure modification is introduced to study the control of a diesel engine. By means of the principle of energy-shaping and Hamiltonian model structure modification theories, the modified energy function is constructed, which is proved to be a quasi-Lyapunov function of the closed-loop system. Finally, the control laws are derived, and the simulations are carried out. The study reveals the dynamic mechanism of diesel engine operation and control and provides a new way to research the modeling and control of a diesel engine system.

26

Bridjesh, Pappula, Pitchaipillai Periyasamy, and Narayanan Kannaiyan Geetha. "Influence of Chemical Composite Additive on Combustion and Emission Characteristics of a Diesel Engine using Waste Plastic Oil as Fuel and Modified Piston Bowl." Oriental Journal of Chemistry 34, no. 6 (November 15, 2018): 2806–13. http://dx.doi.org/10.13005/ojc/340617.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This experimental investigation is an endeavour to substitute diesel with WPO as fuel on a diesel engine. Enhancing the physiochemical properties of WPO or with hardware modifications on the engine, the performance of engine could not be improved up to the mark. The physiochemical properties of WPO are enhanced by the use of composite additive, which is a mixture of soy lecithin and 2-ethylhexyl nitrate and to improve the in-cylinder air motion; subsequently to increase the swirl and turbulence, standard hemispherical combustion chamber is modified to toroidal spherical grooves combustion chamber. The results of combined effect of modifying the combustion chamber and addition of composite additive suggest that improvements in engine-out emissions can be obtained from current diesel engines by enhancing physiochemical properties of fuel and matching geometry of combustion chamber. Engine combustion and emission characteristics under various loads for various fuels under test are as well studied.

27

Baltacioğlu, Mustafa Kaan, Kadi̇r Aydin, Ergül Yaşar, Hüseyi̇n Turan Arat, Çağlar Conker, and Alper Burgaç. "Experimental Investigation of Performance and Emission Parameters Changes on Diesel Engines Using Anisole Additive." Applied Mechanics and Materials 490-491 (January 2014): 987–91. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.987.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In this study, effect of anisole additive into the diesel fuel on performance and emission parameters of diesel engines was investigated. Instead of structural changes which are more difficult and expensive, development of fuel technologies is preferred to provide reduction on exhaust gas emissions which are harmful to environment and human health. Therefore, in this experimental study, anisole was used as additive into diesel fuel with the volumetric ratio of 1,5%, 3% and 5%. The performance characteristics and exhaust emissions of a four cylinder, four stroke, naturally aspirated, water cooled, direct injection compression ignition engine fueled with modified fuels were analyzed. Engine was subjected constant speed, full load conditions during tests. Engine power, torque, specific fuel consumption, carbon monoxide, nitrogen oxide and carbon dioxide emissions were measured and results were evaluated. Changes in performance parameters were negligible for all ratios of modified fuels except specific fuel consumption. Finally, while carbon monoxide gas emissions were increased with anisole additive, carbon dioxide and nitrogen oxide gas emissions were decreased.

28

Chicurel, R. "A modified Otto cycle engine for fuel economy." Applied Energy 38, no. 2 (January 1991): 105–16. http://dx.doi.org/10.1016/0306-2619(91)90069-a.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Guo, Hui, Zhen Dong Zhang, Cong Bo Yin, and Yue Dong Sun. "Experimental and Study of an Direct-Injection, Single Fuel CNG Engine." Advanced Materials Research 225-226 (April 2011): 207–11. http://dx.doi.org/10.4028/www.scientific.net/amr.225-226.207.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In this paper, a single fuel in-cylinder, direct injection compressed natural gas (CNG) engine was presented, which was modified form a 175F gasoline engine, with the 80C196KC single chip microprocessor as the controller. The structure and function of the CNG engine control system, the drive circuits of the injection system, matching its parameters and establishing the control algorithms are introduced. An oxygen sensor was used to adjust the mixture ratio to restore the engine power and reduced the exhaust emission; peak-holding drive circuit of injector was applied to improve its responsibility and spare more electrical energy; high energy ignition system was designed to produce and distribute high enough energy. The result of experimental shows that the power of CNG engine is no lower than 95% of the power of gasoline engien in the most conditions. The exhaust emissions of HC and CO are obviously reduced, compared with the gasoline engine.

30

Kong, S. C., and R. D. Reitz. "Use of Detailed Chemical Kinetics to Study HCCI Engine Combustion With Consideration of Turbulent Mixing Effects." Journal of Engineering for Gas Turbines and Power 124, no. 3 (June 19, 2002): 702–7. http://dx.doi.org/10.1115/1.1413766.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Detailed chemical kinetics was used in an engine CFD code to study the combustion process in HCCI engines. The CHEMKIN code was implemented in KIVA such that the chemistry and flow solutions were coupled. The reaction mechanism consists of hundreds of reactions and species and is derived from fundamental flame chemistry. Effects of turbulent mixing on the reaction rates were also considered. The results show that the present KIVA/CHEMKIN model is able to simulate the ignition and combustion process in three different HCCI engines including a CFR engine and two modified heavy-duty diesel engines. Ignition timings were predicted correctly over a wide range of engine conditions without the need to adjust any kinetic constants. However, it was found that the use of chemical kinetics alone was not sufficient to accurately simulate the overall combustion rate. The effects of turbulent mixing on the reaction rates need to be considered to correctly simulate the combustion and heat release rates.

31

Channappagoudra, Manjunath, K. Ramesh, and Manavendra G. "Effect of Bio-CNG Flow Rate on Modified Diesel Engine Run with Dual Fuel." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 644. http://dx.doi.org/10.14419/ijet.v7i3.34.19406.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In the first phase of investigation standard engine (SE) parameters are modified and optimized as Injector opening pressure (IOP) of 230 bar, Injection timing (IT) of 26.deg.bTDC, Compression ratio (CR) of 18, Nozzle hole (NH) of 5 hole and Piston bowl geometry (PBG) of Re-entrant toroidal piston bowl geometry (RTPBG)) when engine is operated with B20 (20% dairy scum biodiesel+80% diesel) fuel blend sole. The modified engine with these optimized parameters has shown improved brake thermal efficiency (BTE) when compared to standard engine operated with B20 (B20-SE), which could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced swirl and squish in the modified engine. In second phase of investigation, dual fuel (B20+Bio-CNG) experiments are conducted on modified engine to examine the effect Bio-CNG (enriched biogas/methane) flow rates such as 0.12, 0.24, 0.36, 0.48, 0.60 and 0.72 kg/hr on modified engine performance, exhaust emission and combustion characteristics. Then dual fuel experimental results are compared with neat diesel and B20 fuel operations. The dual fueled engine with all Bio-CNG flow rates has resulted lower performance and combustion characteristics with increased emissions (HC and CO) when compared to single fuel (B20) operated engine. From dual operation, it concludes that 0.48 kg/hr Bio-CNG flow rate has experienced the smooth running and improved performance, emission and combustion characteristics among all other Bio-CNG flow rates, hence 0.48 kg/hr Bio-CNG flow rate is optimized.

32

de Oliveira, Felipe, W. de Rossi, and J. L. Rossi. "Laser Modified Thin Layers in Piston Rings." Materials Science Forum 727-728 (August 2012): 1931–37. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1931.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The new engine developments are providing engine mechanical and thermal loads increase on the components. Besides the unfavorable wear conditions, the components should provide similar or improved performance compared with current baselines. For piston rings, the performance is given by the ring capacity of sealing and scrapping. These performances can be measured in an engine using the results of lube oil consumption and blow-by. The main intention of this work is to provide support for new piston rings developments by laser hardening parameters optimization, reducing the wear degradation. Hence, the aim of this work was to evaluate the influence of laser hardening on contact surface from the second ring and verify the microstructure modification and rings shape distortion due to heat input. The results indicate that the laser parameters can be tailored in order to achieve adequate macrostructures and micro constituents distribution. The ring ovality was inside to acceptable levels.

33

Yerrennagoudaru, Hiregoudar, and Manjunatha K. "Numerical Investigation and Fatigue Life Estimation of Conventional and Modified Piston of Diesel Engine." International Journal of Materials, Mechanics and Manufacturing 5, no. 2 (May 2017): 142–45. http://dx.doi.org/10.18178/ijmmm.2017.5.2.306.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Kadhim, Seenaa Rumh. "Investigation of Tribological Properties of Oleic Acid-modified RGO-based Engine Oil Nano Fluid." Neuroquantology 18, no. 6 (June 20, 2020): 49–54. http://dx.doi.org/10.14704/nq.2020.18.6.nq20182.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Saias, Chana Anna, Alvise Pellegrini, Stephen Brown, and Vassilios Pachidis. "Three-spool turbofan pass-off test data analysis using an optimization-based diagnostic technique." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 235, no. 6 (April 15, 2021): 1577–91. http://dx.doi.org/10.1177/09576509211002311.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Production engine pass-off testing is a compulsory technique adopted to ensure that each engine meets the required performance criteria before entering into service. Gas turbine performance analysis greatly supports this process and substantial economic benefits can be achieved if an effective and efficient analysis is attained. This paper presents the use of an integrated method to enable engine health assessment using real pass-off test data of production engines obtained over a year. The proposed method is based on a well-established diagnostic technique enhanced for a highly-complex problem of a three-spool turbofan engine. It makes use of a modified optimization algorithm for the evaluation of the overall engine performance in the presence of component degradation, as well as, sensor noise and bias. The developed method is validated using simulated data extracted from a representative adapted engine performance model. The results demonstrate that the method is successful for 82% of the fault scenarios considered. Next, the pass-off test data are analyzed in two stages. Initially, correlation and trend analyses are conducted using the available measurements to obtain diagnostic information from the raw data. Subsequently, the method is utilized to predict the condition of 264 production turbofan engines undergoing a compulsory pass-off test.

36

Turner, James W. G., Andrew G. J. Lewis, Sam Akehurst, Chris J. Brace, Sebastian Verhelst, Jeroen Vancoillie, Louis Sileghem, Felix C. P. Leach, and Peter P. Edwards. "Alcohol Fuels for Spark-Ignition Engines: Performance, Efficiency, and Emission Effects at Mid to High Blend Rates for Ternary Mixtures." Energies 13, no. 23 (December 3, 2020): 6390. http://dx.doi.org/10.3390/en13236390.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This paper follows on from an earlier publication on high-blend-rate binary gasoline-alcohol mixtures and reports results for some equivalent ternary fuels from several investigation streams. In the present work, new findings are presented for high-load operation in a dedicated boosted multi-cylinder engine test facility, for operation in modified production engines, for knock performance in a single-cylinder test engine, and for exhaust particulate emissions at part load using both the prototype multi-cylinder engine and a separate single-cylinder engine. The wide variety of test engines employed have several differences, including their fuel delivery strategies. This range of engine specifications is considered beneficial with regard to the “drop-in fuel” conjecture, since the results presented here bear out the contention, already established in the literature, that when specified according to the known ternary blending rules, such fuels fundamentally perform identically to their binary equivalents in terms of engine performance, and outperform standard gasolines in terms of efficiency. However, in the present work, some differences in particulate emissions performance in direct-injection engines have been found at light load for the tested fuels, with a slight increase in particulate number observed with higher methanol contents than lower. A hypothesis is developed to explain this result but in general it was found that these fuels do not significantly affect PN emissions from such engines. As a result, this investigation supplies further evidence that renewable fuels can be introduced simply into the existing vehicle fleet, with the inherent backwards compatibility that this brings too.

37

Martinez-Frias, Joel, Salvador M. Aceves, Daniel Flowers, J. Ray Smith, and Robert Dibble. "Thermal Charge Conditioning for Optimal HCCI Engine Operation." Journal of Energy Resources Technology 124, no. 1 (March 1, 2002): 67–75. http://dx.doi.org/10.1115/1.1447928.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This work investigates a purely thermal control system for HCCI engines, where thermal energy from exhaust gas recirculation (EGR) and compression work in the supercharger are either recycled or rejected as needed. HCCI engine operation is analyzed with a detailed chemical kinetics code, HCT (Hydrodynamics, Chemistry and Transport), which has been extensively modified for application to engines. HCT is linked to an optimizer that determines the operating conditions that result in maximum brake thermal efficiency, while meeting the restrictions of low NOx and peak cylinder pressure. The results show the values of the operating conditions that yield optimum efficiency as a function of torque for a constant engine speed (1800 rpm). For zero torque (idle), the optimizer determines operating conditions that result in minimum fuel consumption. The optimizer is also used for determining the maximum torque that can be obtained within the operating restrictions of NOx and peak cylinder pressure. The results show that a thermally controlled HCCI engine can successfully operate over a wide range of conditions at high efficiency and low emissions.

38

Meng, Chao, Jing Ping Si, Ge Xi Liang, and Jia Hua Niu. "The Technical Modification and Performance Analysis of Diesel/LNG Dual Fuel Engines." Advanced Materials Research 724-725 (August 2013): 1383–88. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.1383.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

As the global shortage of oil resource and the rapid increase in car ownership, using gas as the alternative fuel is getting more and more important. Gas fuel, such as LNG (liquefied natural gas), with resource-rich, less pollution and other features, is desirable alternative fuels for cars. In this article, through the engine bench test, a comparative analysis of power performance, fuel economy, emission between diesel/LNG dual engine and diesel engine was done. The result shows that, compared to the original machine , power performance of modified diesel / LNG dual fuel engine decline but isnt obvious. At the same time , fuel economy has a substantial increase. The use of natural gas can relieve shortage of global oil resource and the supply-demand imbalance of oil products. The emission of modified diesel / LNG dual fuel engine has a better state than that of original machines. This kind of modified dual fuel engine is simple, low cost, easily promoted and will be well utilized in future.

39

Wang, Runzhi, Xuemin Li, Jiguang Zhang, Jian Zhang, Wenhui Li, Yufei Liu, Wenjie Fu, and Xiuzhen Ma. "Speed Control for a Marine Diesel Engine Based on the Combined Linear-Nonlinear Active Disturbance Rejection Control." Mathematical Problems in Engineering 2018 (December 13, 2018): 1–18. http://dx.doi.org/10.1155/2018/7641862.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In this paper, a compound control scheme with linear active disturbance rejection control (LADRC) and nonlinear active disturbance rejection control (NLADRC) is designed to stabilize the speed control system of the marine engine. To deal with the high nonlinearity and the complex disturbance and noise conditions in marine engines, the advantages of both LADRC and NLADRC are employed. As the extended state observer (ESO) is affected severely by the inherent characteristics (cyclic speed fluctuation, cylinder-to-cylinder deviations, etc.) of the reciprocating engines, a cycle-detailed hybrid nonlinear engine model is adopted to analyze the impact of such characteristics. Hence, the controller can be evaluated based on the modified engine model to achieve more reliable performance. Considering the mentioned natural properties in reciprocating engines, the parameters of linear ESO (LESO), nonlinear ESO (NLESO), and the switching strategy between LADRC and NLADRC are designed. Finally, various comparative simulations are carried out to show the effectiveness of the proposed control scheme and the superiority of switching strategy. The simulation results demonstrate that the proposed control scheme has prominent control effects both under the speed tracking mode and the condition with different types and levels of load disturbance. This study also reveals that when ADRC related approaches are employed to the reciprocating engine, the impact of the inherent characteristics of such engine on the ESO should be considered well.

40

Polcar, Adam, Marek Žák, Jiří Čupera, and Pavel Sedlák. "Effect of biofuel E85 combustion on fuel consumption in spark-ignition engines." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 60, no. 5 (2012): 173–80. http://dx.doi.org/10.11118/actaun201260050173.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Biofuels represent an alternative source of energy that should gradually decrease our dependence on crude oil. A rapid development of their use in combustion engines is above all the consequence of their very positive balance of emissions. The possibility of use of biofuels in conventional combustion engines is given by their physico-chemical properties. Bioethanol is one of biofuels that can be used in spark-ignition engines. However, because of its lower heating value, it is necessary to change the mixing ratio fuel/air. The aim of this paper is to evaluate the effect of combustion of a mixture of bioethanol with gasoline (in the ratio 85:15) on fuel consumption in the spark-ignition engine. Experimental measurements were performed using a six-cylinder spark-ignition Peugeot engine with the overall volume of 2.946 cm3, which was equipped with a multi-hole system of indirect injection. Obtained results indicated that the combustion of E85 biofuel markedly increased the reduction of specific fuel consumption (corrected to atmospheric conditions). As compared with gasoline Natural 95, the actual volume consumption of E85 biofuel increased under the maximum engine load in average by 30.4 %. In spite of a relatively high consumption of E85 biofuel the total costs associated with running of a modified engine were lower than those of the engine combusting gasoline Natural 95.

41

Kim, Y. Y., Jong T. Lee, and J. A. Caton. "The Development of a Dual-Injection Hydrogen-Fueled Engine With High Power and High Efficiency." Journal of Engineering for Gas Turbines and Power 128, no. 1 (November 22, 2005): 203–12. http://dx.doi.org/10.1115/1.1805551.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

To achieve high power and high efficiency in a hydrogen-fueled engine for all load conditions, the dual-injection hydrogen-fueled engine, which can derive the advantages of both high efficiency from external mixture hydrogen engine and high power from direct cylinder injection was developed. For verifying the feasibility of the above engine, a high-pressure hydrogen injector of ball-valve type and actuated by a solenoid was developed. A systematic experimental study was conducted by using a modified single-cylinder dual-injection hydrogen-fueled engine, which was equipped with both an intake injector and high-pressure in-cylinder injector. The results showed that (i) the developed high pressure hydrogen injector with a solenoid actuator had good gas tightness and fine control performance, (ii) the transient injection region, in which injection methods are changed from external fuel injection to direct-cylinder injection, ranged from 59 to 74% of the load, and (iii) the dual-injection hydrogen-fueled engine had the maximum torque of direct-cylinder fuel injection and the maximum efficiency of external fuel mixture hydrogen engines.

42

Golak, Karol. "Validity Check of the Assessment of a Jet Turbine Engine Regulation in Flight Using a Computer Simulation." Solid State Phenomena 199 (March 2013): 123–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.123.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In this paper, a method of evaluation of the turbojet engine regulation condition in flight, based on information from its ground tests was presented. The tested engine was presented by the single comprehensive model which links input (in form of the modified signal mp4) and engine output (in form of the modified signal np2). Changes of the model parameters following during its operation can be defined using changes of the proposed simulation model parameters describing the engine operation both in flight and during ground tests.

43

Radicchi, Fábio, Raphael M. Braga, Raniro A. Coelho, Roberto B. R. Costa, and Ramon Molina Valle. "Numerical Analysis of a Torch-Ignition System for an Internal Combustion Engine." Applied Mechanics and Materials 798 (October 2015): 234–38. http://dx.doi.org/10.4028/www.scientific.net/amm.798.234.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Torch ignition systems in spark-ignition engines represents an interesting option in the efforts to reduce pollutants emission and specific fuel consumption. Based on this idea, this paper presents a 3D model of a prechamber created for a spark-ignition engine and focuses on the numerical analysis of the fluid flow inside the modified chamber. This kind of analysis is very important once it allowed evaluating aspects like turbulence parameters, pressure inside the chamber and prechamber, fluid recirculation and a possible prechamber’s geometry for the engine. The studies were done in a four valve Single Cylinder Research Engine – SCRE. For the numerical modeling and fluid flow investigation was used STAR-CD software. Results show higher values of tumble ratio and kinetic energy with the prechamber.

44

Barelko, Viktor, Oleg Brizitsky, Maxim Kuznetsov, Ivan Parkin, and Alexey Safonov. "Prospects of engine building transformation to the hydrogen-containing fuel." MATEC Web of Conferences 341 (2021): 00055. http://dx.doi.org/10.1051/matecconf/202134100055.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Promising developments in the field of engine building, associated with increasing of natural gas usage as a motor fuel for internal combustion engines (ICE), are presented. Technology of hydrogen-containing fuel composition forming created. Advantages of motor transport based on ICE with GHA: lower amount of toxic (reduction of CO release) of about 7 times; retention of existing infrastructure of fuel supply with decrease of fuel consumption of 12-17%; safety; reasonable combination of advantages of hydrocarbon and hydrogen power engineer. The perspectives of modified engines for the various interested organizations and ministries operating gasoline and diesel vehicles are discussed.

45

Girtler, Jerzy. "A method for evaluating theoretical and real operation of diesel engines in energy conversion formulation taking into account their operating indices." Polish Maritime Research 18, no. 3 (January 1, 2011): 31–36. http://dx.doi.org/10.2478/v10012-011-0014-y.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

A method for evaluating theoretical and real operation of diesel engines in energy conversion formulation taking into account their operating indices The article proposes valuating the operation of an arbitrary diesel engine, based on the sample case of a ship's main engine in which energy conversion processes take place in a given time. The above operation is understood as the energy transfer to the screw propeller in the given time in which the energy conversion into work and/or heat and its further transmission take place. The here proposed method for evaluating the operation of the main engines installed in marine power plants consists in comparing the operation of these engines to a physical quantity the measuring unit of which is the joule-second (joule x second). A new term is introduced which bears the name of the theoretical engine operation and is the standard (ideal) operation which can be compared to the operation of real engines revealing different levels of wear. It was shown that the calculations of the theoretical operation defined in the above way cannot make direct use of commonly known theoretical Diesel and Sabathe cycles. Instead they should use the cycles modified by heat abstraction taking place in accordance with the isobaric, or isothermal process. Other new terms introduced in the article are: the degree of excellence of energy conversion to work, considered as the measure of excellence of engine operation, and the degree of engine operation dissipation, being the measure of its real operation. It is shown that if in time t of engine operation the case takes place that: Li = idem and Le = idem, then the engine operation dissipation is equal to its mechanical efficiency.

46

Shoukat, Touqeer, and Pyeong Jun Yoo. "Rheology of Asphalt Binder Modified with 5W30 Viscosity Grade Waste Engine Oil." Applied Sciences 8, no. 7 (July 20, 2018): 1194. http://dx.doi.org/10.3390/app8071194.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The pavement structure tends to shrink under low temperature conditions and cracks will appear upon crossing threshold binder stiffness. Decreasing the binder viscosity at such low temperatures, by introducing additional oil fraction (aromatics and saturates) in asphalt colloidal systems, may result in improved resistance to thermal cracking. A single multi-grade engine oil (5W30) was used in this study to analyze the rheological properties imparted to binders. Rotational Viscosity (RV) test revealed that after Rolling Thin Film Oven (RTFO) aging, fresh oil and waste oil have a similar effect on decreasing the viscosity of binder and construction temperatures, reducing them by 5~8 °C. Fourier Transform Infrared Spectroscopy (FTIR) test results showed an abrupt increase of carbonyl concertation when fresh engine oil was used for rejuvenation while waste engine oil was less susceptible to oxidative aging. Dynamic analysis of modified binders proved that engine oil has better thermal cracking resistance but relaxation ability of binders and rutting resistance was impaired. Filtered waste engine oil resulted in a 35% decrement in the stiffness of binder compared to virgin asphalt after short term aging but upper Performance Grade (PG) was compromised by 1~3 °C with 2.5% oil inclusion. Unfiltered waste engine oil proved to have the least overall performance compared to fresh and filtered waste engine oil.

47

Al-Bdeiri, Mahmood, Vladimir Krasilnikov, and Sergey Sergeev. "Modified quasi-stationary method for studying changes in transition temperatures of diesel engine pistons coated with heat-shielding materials." Proceedings of Irkutsk State Technical University 24, no. 5 (October 2020): 954–65. http://dx.doi.org/10.21285/1814-3520-2020-5-954-965.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The purpose of the work is to identify complex transient heat flow paths in the combustion chamber of engine, significantly improve the models of diesel engine heat flow, and study the effect of aluminum oxide coating by the galvanic plasma method on short-term and long-term reactions of the piston head. The analysis of operation of aluminum alloy coated diesel engine piston is carried out using a modified quasi -steady method and a finite element method. A thermodynamic analysis is presented using energy and state equations with corresponding gas heat transfer. Time-dependent boundary conditions are set on the gas-blown surfaces of 2D finite element transition models of combustion chamber components. It is shown that this methodology can reveal complex transient paths of the heat flow in engine combustion chambers and distribution details of heat losses in various cooling media. Numerical simulation has shown that the maximum temperature increase relative to the uncoated piston is 64.3% for the coating thickness of 0.13 mm. Tests have shown that the coatings can endure up to 280 thermal cycles. It is found out that predictions of numerical simulation are in good agreement with the results of experiments conducted with repaired pistons. The experimental operation of Cummins КТА 38 engines at Chernogorsk and Vostochno-Beysk coal mines has shown that the engine equipped after repair with the piston coated with aluminum applied by the galvanic plasma method has been in operation for 2 years and 3 months, whereas its set overhaul period is 18,000 hours. Therefore, the proposed methodology allows to reduce temperature variations in the piston and, thereby increase the service life of engine pistons coated with the use of the thermal barrier coating technology.

48

Cui, Zhi Qin, Teng Zhang, Xiao Hua Wang, and Zhao Hua Xu. "Dynamic Optimization Design of Engine Crankshaft." Applied Mechanics and Materials 128-129 (October 2011): 1426–29. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.1426.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

With the constant improvement of the engine enhanced index, the crankshaft working conditions are even more critical. For designing a better dynamic performances of crankshaft, dynamic optimization design of crankshaft is researched. Boundary restrictions and dynamic loading conditions that simulate the actual ones are exerted on the finite element model of the crankshaft and its dynamic responses are calculated. Based on the sensitivity analysis method, the to-be-modified parameters are selected from the parameters which vary the dynamic properties greatly. With this method, the dynamic properties of the modified crankshaft could satisfy the design requirements, and lays a solid foundation of the dynamic optimization designing of complete engine.

49

Tian, Hua, Jingchen Cui, Tianhao Yang, Yao Fu, Jiangping Tian, and Wuqiang Long. "Experimental Research on Controllability and Emissions of Jet-Controlled Compression Ignition Engine." Energies 12, no. 15 (July 31, 2019): 2936. http://dx.doi.org/10.3390/en12152936.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Low-temperature combustions (LTCs), such as homogeneous charge compression ignition (HCCI), could achieve high thermal efficiency and low engine emissions by combining the advantages of spark-ignited (SI) engines and compression-ignited (CI) engines. Robust control of the ignition timing, however, still remains a hurdle to practical use. A novel technology of jet-controlled compression ignition (JCCI) was proposed to solve the issue. JCCI combustion phasing was controlled by hot jet formed from pre-chamber spark-ignited combustion. Experiments were done on a modified high-speed marine engine for JCCI characteristics research. The JCCI principle was verified by operating the engine individually in the mode of JCCI and in the mode of no pre-chamber jet under low- and medium-load working conditions. Effects of pre-chamber spark timing and intake charge temperature on JCCI process were tested. It was proven that the combustion phasing of the JCCI engine was closely related to the pre-chamber spark timing. A 20 °C temperature change of intake charge only caused a 2° crank angle change of the start of combustion. Extremely low nitrogen oxides (NOx) emission was achieved by JCCI combustion while keeping high thermal efficiency. The JCCI could be a promising technology for dual-fuel marine engines.

50

La, Duong Duc, Tuan Ngoc Truong, Thuan Q. Pham, Hoang Tung Vo, Nam The Tran, Tuan Anh Nguyen, Ashok Kumar Nadda, et al. "Scalable Fabrication of Modified Graphene Nanoplatelets as an Effective Additive for Engine Lubricant Oil." Nanomaterials 10, no. 5 (May 1, 2020): 877. http://dx.doi.org/10.3390/nano10050877.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The use of nano-additives is widely recognized as a cheap and effective pathway to improve the performance of lubrication by minimizing the energy loss from friction and wear, especially in diesel engines. In this work, a simple and scalable protocol was proposed to fabricate a graphene additive to improve the engine lubricant oil. Graphene nanoplates (GNPs) were obtained by a one-step chemical exfoliation of natural graphite and were successfully modified with a surfactant and an organic compound to obtain a modified GNP additive, that can be facilely dispersed in lubricant oil. The GNPs and modified GNP additive were characterized using scanning electron microscopy, X-ray diffraction, atomic force microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. The prepared GNPs had wrinkled and crumpled structures with a diameter of 10–30 µm and a thickness of less than 15 nm. After modification, the GNP surfaces were uniformly covered with the organic compound. The addition of the modified GNP additive to the engine lubricant oil significantly enhanced the friction and antiwear performance. The highest reduction of 35% was determined for the wear scar diameter with a GNP additive concentration of approximately 0.05%. The mechanism for lubrication enhancement by graphene additives was also briefly discussed.

Статті в журналах з теми "Modified engine"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями