Journal articles: 'Opposed piston engine'

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Parker, J. K., S. R. Bell, and D. M. Davis. "An Opposed-Piston Diesel Engine." Journal of Engineering for Gas Turbines and Power 115, no. 4 (October 1, 1993): 734–41. http://dx.doi.org/10.1115/1.2906767.

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Typical conventional diesel engine designs are based on arrangements of single piston and cylinder sets placed sequentially either in-line or offset (“V”) along the crankshaft. The development of other engines, such as the opposed piston type, has been motivated by potential advantages seen in such designs, which may not be viable in conventional in-line or V engine arrangements. Several alternatives to conventional engine design have been investigated in the past and some aspects of these designs have been utilized by engine manufacturers. The design and development of a proof-of-concept opposed piston diesel engine is summarized in this paper. An overview of opposed-piston engines is presented from early developments to current designs. The engine developed in this work is a two stroke and uses four pistons, which move in two parallel cylinders that straddle a single crankshaft. A prechamber equipped with a single fuel injector connects the two cylinders, forming a single combustion chamber. The methodology of the engine development process is discussed along with details of component design. Experimental evaluations of the assembled proof-of-concept engine were used for determining feasibility of the design concept. An electric dynamometer was used to motor the engine and for loading purposes. The dynamometer is instrumented for monitoring both speed and torque. Engine parameters measured include air flow rate, fuel consumption rate, inlet air and exhaust temperatures, and instantaneous cylinder gas pressure as a function of crank position. The results of several testing runs are presented and discussed.

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Gregório, Jorge P., and Francisco M. Brójo. "Development of a 4 stroke spark ignition opposed piston engine." Open Engineering 8, no. 1 (November 3, 2018): 337–43. http://dx.doi.org/10.1515/eng-2018-0039.

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Abstract The purpose of this project was to develop a low-cost OP engine, 4-stroke, gasoline by joining two single-cylinder reciprocating internal combustion engines with side valves on the block, removing the heads. The chosed engine was Model EY15 of Robin America. Joining these two engine blocks together made possible to build an opposed-piston engine (OPE) with two crankshafts. In this new engine, the combustion chamber is confined to the space inside the cylinder between the piston heads and the chamber between the valves. The pistons move in the cylinder axis in opposite directions, a feature typical of opposed-piston engines. After building the engine, parameters characteristic of the OPE, such as: rotational speed, torque, fuel consumption and emissions, were measured on an Eddy currents dynamometer. With the collected data, power, specific consumption and overall efficiency were calculated, allowing to conclude that the motor with the opposed-piston configuration is less expensive and is more powerful. The development of the opposed-piston engine in this project has shown that it is feasible to build one engine from a different one already in use, reducing the manufacturing and development costs. In addition, higher power can be obtained with better specific fuel consumption and less vibration.

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Pietrykowski, K., and M. Biały. "Multibody analysis of the opposed-piston aircraft engine vibrations." Journal of Physics: Conference Series 2130, no. 1 (December 1, 2021): 012005. http://dx.doi.org/10.1088/1742-6596/2130/1/012005.

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Abstract One of the characteristic features of piston engines are vibrations caused by the pistons moving in the cylinders. During the engine design process, it is necessary to determine the level of vibration that can occur in the engine. This is especially important for aircraft engines. Due to the minimization of the weight of the aircraft, it is necessary to limit the factors that may cause damage to the structure. One of these factors is engine vibration, which can cause resonance and, consequently, a dangerous stress concentration. Long-term action of variable loads may also lead to the formation of fatigue cracks. The article presents the results of a multibody analysis of an opposed-piston diesel engine. It is a two-stroke three-cylinder aircraft engine. The engine has two crankshafts and six pistons that run opposite each other, but the rotation of the shafts is shifted in phase 14°. Engine vibration will also be caused by crankshafts which, to reduce weight, are not equipped with counterweights. The calculation results are presented in the form of time courses of forces and displacements on the engine supports and FFT analysis of the vibration velocity. The results show that the maximum vibration velocity is 7 mm/s and occurs at a frequency of 140 Hz, which corresponds to twice the rotational speed of the crankshafts. The results obtained from the tests allow for the selection of the flexible elements used in the real prototype engine supports.

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Pietrykowski, K. "FEM analysis of the opposed-piston aircraft engine block." Journal of Physics: Conference Series 2130, no. 1 (December 1, 2021): 012034. http://dx.doi.org/10.1088/1742-6596/2130/1/012034.

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Abstract An important aspect of aircraft engine design is weight minimization. However, excessive weight reduction may reduce mechanical strength of the engine. This is especially important for aero-engines due to consequences of engine failure in flight. The article presents the results of the FEM opposed-piston diesel engine block model tests. The tested engine is a PZL-100 two-stroke three-cylinder aircraft engine with two crankshafts and six pistons. Air is supplied via a mechanical compressor and a turbocharger. Stress in the engine block is induced by the operating process of the engine block. The pressure in the combustion chamber of the analyzed engine is 13 MPa. The pistons in one of the cylinders are then near their TDC, the deflection angle of the connecting rods is small so almost the entire piston force is transferred to the crankshafts and then to the main bearing supports. This results in the occurence of a tensile force for the engine block applied in the bolt holes of the shaft supports. The calculation results are presented as stress and displacement distributions on the surface and selected block sections. The maximum values on the outer surfaces of the block occurred in the area of the compressor attached to the block and reached 39 MPa. Maximum stresses were, however, observed inside the block on the air and exhaust flow separators between the cylinder liners. The stress value on the outlet side reached 44 MPa.

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TULWIN, Tytus, Mirosław WENDEKER, and Zbigniew CZYŻ. "The swirl ratio influence on combustion process and heat transfer in the opposed piston compression-ignition engine." Combustion Engines 170, no. 3 (August 1, 2017): 3–7. http://dx.doi.org/10.19206/ce-2017-301.

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In order to maximise engine heat efficiency an engines charge flow must be properly designed -especially its swirl and tumble ratio. A two-stroke compression-ignition opposed piston engine reacts to engine swirl differently compared to a standard automotive engine with axially symmetric combustion chamber. In order to facilitate direct fuel injection, high-pressure injectors must be positioned from the side of combustion chamber. Depending on the combustion chamber geometry the swirling gases impact greatly how the injection stream is formed. If the deformation is too high the high temperature combustion gases can hit the piston surface or get into gaps between the pistons. This greatly affects the heat lost to the pistons and raises their local temperature. More atomised injection stream is more prone to swirling gas flow due to its reduced droplet size and momentum. The paper presents simulation results and analyses for different intake process induced swirl ratios and different types of combustion chambers in an experimental aviation opposed piston engine.

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Kudo, Shokiku. "Full port opposed piston engine (FOP)." Proceedings of the National Symposium on Power and Energy Systems 2021.25 (2021): D124. http://dx.doi.org/10.1299/jsmepes.2021.25.d124.

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Shokrollahihassanbarough, Farzad, Ali Alqahtani, and Mirosław Wyszynski. "Thermodynamic simulation comparison of opposed two-stroke and conventional four-stroke engines." Combustion Engines 162, no. 3 (August 1, 2015): 78–84. http://dx.doi.org/10.19206/ce-116867.

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Today’s technology leveraging allows OP2S (Opposed Piston 2-Stroke) engine to be considered as an alternative for the conventional four-stroke (4S) engines as mechanical drive in various applications, mainly in transportation. In general, OP2S engines are suited to compete with conventional 4-stroke engines where power-to-weight ratio, power-to-bulk volume ratio and fuel efficiency are requirements. This paper does present a brief advent, as well as the renaissance of OP2S engines and the novel technologies which have been used in the new approach. Also precise thermodynamic benefits have been considered, to demonstrate the fundamental efficiency advantage of OP2S engines. Hence, simulations of two different engine configurations have been taken into consideration: a one-cylinder opposed piston engine and two-cylinder conventional piston four-stroke engine. In pursuance of fulfilling this goal, the engines have been simulated in AVL Boost™ platform which is one of the most accurate Virtual Engine Tools, to predict engine performance such as combustion optimization, emission and fuel consumption. To minimize the potential differences of friction losses, the bore and stroke per cylinder are taken as constant. The closed-cycle performance of the engine configurations is compared using a custom analysis tool that allows the sources of thermal efficiency differences to be identified and quantified. As a result, brake thermal efficiency, power and torque of OP2S engine have been improved compared to conventional engines while emission concern has been alleviated.

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Hofbauer, Peter, and Diana D. Brehob. "Opposed-Piston Opposed-Cylinder Engine for Heavy-Duty Trucks." MTZ worldwide 73, no. 4 (April 2012): 48–54. http://dx.doi.org/10.1007/s38313-012-0266-7.

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OPALIŃSKI, Marcin, Andrzej TEODORCZYK, and Jakub KALKE. "The closed-cycle model numerical analysis of the impact of crank mechanism design on engine efficiency." Combustion Engines 168, no. 1 (February 1, 2017): 153–60. http://dx.doi.org/10.19206/ce-2017-125.

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The research presents a review and comparison of different engine constructions. Investigated engines included crankshaft engines, barrel engine, opposed-piston engines and theoretical models to present possible variations of piston motion curves. The work comprises also detailed description of a numerical piston engine model which was created to determine the impact of the cycle parameters including described different piston motion curves on the engine efficiency. Developed model was equipped with Wiebe function to reflect a heat release during combustion event and Woschini’s correlation to simulate heat transfer between the gas and engine components.Various scenarios of selected engine constructions and different working conditions have been simulated and compared. Based on the results it was possible to determine the impact of different piston motion curves on the engine cycle process and present potential efficiency benefits.

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Hebbalkar, Sunil S., and Kaushik Kumar. "Designing of a Balanced Opposed Piston Engine." Applied Mechanics and Materials 852 (September 2016): 719–23. http://dx.doi.org/10.4028/www.scientific.net/amm.852.719.

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An internal combustion engine with opposed piston engine (OPE) develops higher power density than any other conventional internal combustion engine by virtue of its design. A Two stroke OPE gives two power stroke within 3600 of crank revolution which indicates the higher power density. But this extra power also results in large amount of forces gets transmitted to both the crankshaft amounting to large unbalance in the engine. Hence for a smoother and noise free performance, engine should be dynamically balanced. So balancing is one of the main criteria for better performance. In this paper the dynamic analysis was performed by varying the linkage dimensions of OPE for balance OPE. The analytical calculation of inertia forces and dimensions for linkages has been compared with software based results, depending on pressure crank angle plot for two stroke engine.

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Pei, Tianyou, Shuheng Qiu, Feixue Chen, Weiwei Gao, Zheng Li, and Chi Zhang. "Design of opposed piston 2-stroke internal combustion engine test platform." Journal of Physics: Conference Series 2235, no. 1 (May 1, 2022): 012076. http://dx.doi.org/10.1088/1742-6596/2235/1/012076.

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Abstract Opposed piston two-stroke engine, due to its characteristics of fast expansion, high power density and indicate efficiency, and dynamic balancing, attracts many researchers’ attention. In order to explore its combustion performance, a novel test platform consisting of a drive system and combustion control system is proposed in this paper. The drive system mainly contains a 75-kW induction motor, a synchronous gearbox, and two crankshaft mechanisms. The displacement of the piston and chamber pressure is acquired and used to control combustion parameters. Using this mechanical device, the rotary motion can be converted to the opposite movement of the two pistons precisely. All the designed functions of the platform are verified by the combustion experiments of an opposed-piston two-stroke prototype. Furthermore, the experimental data is used to verify a one-dimension simulation model to evaluate the combustion characteristics of the prototype.

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Magryta, Paweł, and Michał Gęca. "FEM analysis of piston for aircraft two stroke diesel engine." MATEC Web of Conferences 252 (2019): 07004. http://dx.doi.org/10.1051/matecconf/201925207004.

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The paper presents an analysis of piston thermal loads in an opposed piston engine. The purpose of the work was to check the achieved thermal values of different piston models. Two types of pistons were analysed. The first piston was made entirely of aluminium. The second one was a split piston, made of steel and aluminium. Simulation studies were performed using Abaqus software. Boundary conditions were taken from previously made simulations conducted in AVL Fire software. The wall temperature of the piston was mapped from CFD combustion model. The results of the analyses were illustrated by the distribution of temperature fields on a piston surface. The distribution of temperature fields on the piston surface shows that maximum temperatures are located on sharp edges of a piston bowl, values of maximum temperatures are 402 and 512 °C for aluminium and composed piston respectively.

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Zhang, Qinglin, Zhaoping Xu, Shuangshuang Liu, and Liang Liu. "Effects of Injector Spray Angle on Performance of an Opposed-Piston Free-Piston Engine." Energies 13, no. 14 (July 20, 2020): 3735. http://dx.doi.org/10.3390/en13143735.

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A free-piston engine is a novel internal combustion engine which has the advantages of a variable compression ratio and multi-fuel adaptability. This paper focuses on numerical simulation for combustion process and spray angle optimization of an opposed-piston free-piston engine. The working principle and spray-guided central combustor structure of the engine are discussed. A three-dimensional computational fluid dynamic model with moving mesh is presented based on the tested piston motion of the prototype. Calculation conditions, spray models, and combustion models were set-up according to the same prototype. The effects of spray angle on fuel evaporation rate, mixture distribution, heat release rate, in-cylinder pressure, in-cylinder temperature, and emissions were simulated and analyzed in detail. The research results indicate that the performance of the engine was very sensitive to the spray angle. The combustion efficiency and the indicated thermal efficiencies of 97.5% and 39.7% were obtained as the spray angle reached 40°.

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PYSZCZEK, Rafał, Paweł MAZURO, Agnieszka JACH, and Andrzej TEODORCZYK. "Numerical investigation on low calorific syngas combustion in the opposed-piston engine." Combustion Engines 169, no. 2 (May 1, 2017): 53–63. http://dx.doi.org/10.19206/ce-2017-210.

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The aim of this study was to investigate a possibility of using gaseous fuels of a low calorific value as a fuel for internal combustion engines. Such fuels can come from organic matter decomposition (biogas), oil production (flare gas) or gasification of materials containing carbon (syngas). The utilization of syngas in the barrel type Opposed-Piston (OP) engine arrangement is of particular interest for the authors. A robust design, high mechanical efficiency and relatively easy incorporation of Variable Compression Ratio (VCR) makes the OP engine an ideal candidate for running on a low calorific fuel of various compostion. Furthermore, the possibility of online compression ratio adjustment allows for engine the operation in Controlled Auto-Ignition (CAI) mode for high efficiency and low emission. In order to investigate engine operation on low calorific gaseous fuel authors performed 3D CFD numerical simulations of scavenging and combustion processes in the 2-stroke barrel type Opposed-Piston engine with use of the AVL Fire solver. Firstly, engine operation on natural gas with ignition from diesel pilot was analysed as a reference. Then, combustion of syngas in two different modes was investigated – with ignition from diesel pilot and with Controlled Auto-Ignition. Final engine operating points were specified and corresponding emissions were calculated and compared. Results suggest that engine operation on syngas might be limited due to misfire of diesel pilot or excessive heat releas which might lead to knock. A solution proposed by authors for syngas is CAI combustion which can be controlled with application of VCR and with adjustment of air excess ratio. Based on preformed simulations it was shown that low calorific syngas can be used as a fuel for power generation in the Opposed-Piston engine which is currently under development at Warsaw University of Technology.

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Mazuro, Paweł, and Barbara Makarewicz. "The Potential of Wobble Plate Opposed Piston Axial Engines for Increased Efficiency." Energies 13, no. 21 (October 26, 2020): 5598. http://dx.doi.org/10.3390/en13215598.

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Recent announcements regarding the phase out of internal combustion engines indicate the need to make major changes in the automotive industry. Bearing in mind this innovation trend, the article proposes a new approach to the engine design. The aim of this paper is to shed a new light on the forgotten concept of axial engines with wobble plate mechanism. One of their most important advantages is the ease of use of the opposed piston layout, which has recently received much attention. Based on several years of research, the features determining the increase in mechanical efficiency, lower heat losses and the best scavenging efficiency were indicated. Thanks to the applied Variable Compression Ratio (VCR), Variable Angle Shift (VAS) and Variable Port Area (VPA) systems, the engine can operate on various fuels in each of the Spark Ignition (SI), Compression Ignition (CI) and Homogeneous Charge Compression Ignition (HCCI)/Controlled Auto Ignition (CAI) modes. In order to quantify the potential of the proposed design, an initial research of the newest PAMAR 4 engine was presented to calculate the torque curve at low rotational speeds. The achieved torque of 500 Nm at 500 rpm is 65% greater than the maximum torque of the OM 651 engine of the same 1.8 L capacity. The findings lead to the conclusion that axial engines are wrongfully overlooked and can significantly improve research on new trends in pollutant elimination.

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Xu, Zhao Ping, and Si Qin Chang. "Simulation of an Opposed-Piston Four-Stroke Free-Piston Generator." Applied Mechanics and Materials 336-338 (July 2013): 585–89. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.585.

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In order to achieve efficient conversion of the chemical energy of fuel into the electrical energy, a novel opposed-piston four-stroke free-piston generator is developed in this paper by equipping one free-piston engine with two linear generators. Mathematical models of the opposed-piston four-stroke free-piston generator are created based on the kinetic equation of the free-piston motion, the state equation of the ideal gas, and an equivalent heat release function of the combustion process. Dynamical properties of the system are simulated and analyzed by using the created model, and results from the simulation are presented. According to the simulation, the new four-stroke free-piston generator can realize running without vibrations.

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HOSHINO, Takeshi. "Performance evaluations of semi-free piston Stirling engine with opposed piston configuration." Proceedings of the Symposium on Stirlling Cycle 2002.6 (2002): 35–38. http://dx.doi.org/10.1299/jsmessc.2002.6.35.

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Czyż, Zbigniew, Ksenia Siadkowska, and Rafał Sochaczewski. "CFD Analysis of Charge Exchange in an Aircraft Opposed-Piston Diesel Engine." MATEC Web of Conferences 252 (2019): 04002. http://dx.doi.org/10.1051/matecconf/201925204002.

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The paper presents a description of geometric models, computational algorithms, and results of numerical analysis of charge exchange in an opposed-piston two-stroke engine. The research engine is a newly designed internal diesel engine. This unit is composed of three cylinders in which operate three pairs of opposed-pistons. The engine generates a power output equal to 100 kW at a crankshaft rotation speed of 3800-4000 rpm. The numerical investigations were carried out using ANSYS FLUENT solver. The geometrical model includes an intake manifold, a cylinder and an outlet manifold. The study was conducted for a series of modifications of manifolds and intake and exhaust ports to optimise the charge exchange process in the engine. In addition, we attempted to verify the effect of the combustion chamber shape on the charge exchange process in the engine. The calculations specified a swirl coefficient obtained under steady conditions for fully open intake and exhaust ports as well as the CA value of 280° for all cylinders. In addition, mass flow rates were identified separately in all of the intake and exhaust ports to achieve the best possible uniformity of flow in particular cylinders. The paper includes comparative analyses of all of the intake and exhaust manifolds of the designed engine.

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Huo, Ping, Jian Ping Wang, and Qiu Yan Sun. "Analysis of Self-Balance Characteristics of OPOC Engine." Advanced Materials Research 211-212 (February 2011): 93–96. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.93.

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Considering the structure feature and working principle of Opposed Piston Opposed Cylinder engine, mathematical model of kinematics relationship for internal-external piston is build. Using ADAMS software to process kinematics characteristics simulation study and comparing the simulation results with traditional diesel engine, it indicate that the OPOC two-stroke engine has better self-balancing character, less kinematics inertial force and cylinder lateral pressure, and is helpful in reducing the frictional power consumption, and improving the noise-vibration smoothness.

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Ma, Fukang, Wei Yang, Junfeng Xu, Yufeng Li, Zhenfeng Zhao, Zhenyu Zhang, and Yifang Wang. "Experimental Investigation of Combustion Characteristics on Opposed Piston Two-Stroke Gasoline Direct Injection Engine." Energies 14, no. 8 (April 9, 2021): 2105. http://dx.doi.org/10.3390/en14082105.

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The combustion characteristics of an opposed-piston two-stroke gasoline engine are investigated with experiment. The energy conversion and exergy destruction are analyzed and the organization method of the combustion process is summarized. The effects of phase difference, scavenging pressure, injection timing, ignition timing, and dual spark plug ignition scheme on the combustion process and engine performance are discussed, respectively. The heat release rate of the opposed-piston two-stroke gasoline engine is consistent with the conventional gasoline engine. With the increase of opposed-piston motion phase difference, the scavenging efficiency decreases and overmuch residual exhaust gas is not beneficial to the combustion process. Meanwhile, the faster relative velocity of the opposed-piston near the inner dead center enhances the cylinder working volume change rate, which leads to the rapid decline of in-cylinder pressure and temperature. The 15 °CA of opposed-piston motion phase difference improves the scavenging and combustion process effectively. When scavenging pressure is 0.12 MPa, the scavenging efficiency and heat release rate are improved at medium-high speed conditions. With the delay of injection timing, the flame developing period decreases gradually, and the rapid burning period decreases and then increases. The rapid burning period may reach the minimum value when the injection advance angle is 100 °CA. With the delay of ignition timing, the flame developing period increases gradually, and the rapid combustion period decreases and then increases. The rapid combustion period may reach the minimum value when the ignition advance angle is 20 °CA. Notably, the flat-top piston structure should be matched with the dual spark plug, which the ignition advance angle is 20 °CA at medium-high load conditions.

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Ma, Fukang, Shuanlu Zhang, Zhenfeng Zhao, and Yifang Wang. "Research on the Operating Characteristics of Hydraulic Free-Piston Engines: A Systematic Review and Meta-Analysis." Energies 14, no. 12 (June 14, 2021): 3530. http://dx.doi.org/10.3390/en14123530.

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The hydraulic free-piston engine (HFPE) is a kind of hybrid-powered machine which combines the reciprocating piston-type internal combustion engine and the plunger pump as a whole. In recent years, the HFPE has been investigated by a number of research groups worldwide due to its potential advantages of high efficiency, energy savings, reduced emissions and multi-fuel operation. Therefore, our study aimed to assess the operating characteristics, core questions and research progress of HFPEs via a systematic review and meta-analysis. We included operational control, starting characteristics, misfire characteristics, in-cylinder working processes and operating stability. We conducted the literature search using electronic databases. The research on HFPEs has mainly concentrated on four kinds of free-piston engine, according to piston arrangement form: single piston, dual pistons, opposed pistons and four-cylinder complex configuration. HFPE research in China is mainly conducted in Zhejiang University, Tianjin University, Jilin University and the Beijing Institute of Technology. In addition, in China, research has mainly focused on the in-cylinder combustion process while a piston is free by considering in-cylinder combustion machinery and piston dynamics. Regarding future research, it is very important that we solve the instabilities brought about by chance fluctuations in the combustion process, which will involve the hydraulic system’s efficiency, the cyclical variation, the method of predicting instability and the recovery after instability.

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Jackiewicz, Jacek. "Application of Torsional Dampers for the Vibrations Reduction in Crankshafts of Piston Aircraft Engines." MATEC Web of Conferences 357 (2022): 01009. http://dx.doi.org/10.1051/matecconf/202235701009.

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It is a well-known fact that piston engines shake, among which some of them more than others. Therefore, such type of vibrations, created by piston engines, should be controlled somehow. For the reduction of torsional crankshaft vibrations, torsional dampers are often used. The crankshaft vibrations are intrinsic in any internal combustion engine because of the powerful though unequal forces, which act directly on its crankshaft. Although the dampers will not add engine horsepower, lack of using them causes that crankshaft vibrations will hamper the horsepower potential of engines. The study attempts to explore how torsional-vibration damping methods can be improved for traditional aircraft horizontally-opposed engines.

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NAKASHIMA, Masaru, Shunta MIYAZAKI, Kohei KAWATE, Kota TOSHIMA, Hiroyuki ASOU, Changjun LIN, and Korai TAKAO. "Development of an Opposed-Piston Two-Stroke Engine Device using Model Engines." Proceedings of Conference of Kyushu Branch 2021.74 (2021): B31. http://dx.doi.org/10.1299/jsmekyushu.2021.74.b31.

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Robinson, Matthew C., Nigel N. Clark, and Parviz Famouri. "Resonance of a Spring Opposed Free Piston Engine Device." SAE International Journal of Engines 9, no. 1 (April 5, 2016): 576–87. http://dx.doi.org/10.4271/2016-01-0568.

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Zhu, Yongsheng, Yang Wang, Xudong Zhen, Shuai Guan, Jiancai Wang, Yining Wu, Yujin Chen, and Shujun Yin. "The control of an opposed hydraulic free piston engine." Applied Energy 126 (August 2014): 213–20. http://dx.doi.org/10.1016/j.apenergy.2014.04.007.

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Wu, Limin, Huihua Feng, Ziwei Zhang, Boru Jia, Jiayu Wang, Fengyuan Yang, and Qiming Lei. "Experimental analysis on the operation process of opposed-piston free piston engine generator." Fuel 325 (October 2022): 124722. http://dx.doi.org/10.1016/j.fuel.2022.124722.

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HU, Yong, and Akira HIBI. "Hydraulic free piston internal combustion engine. Theoretical investigation of the opposed piston type." Transactions of the Japan Society of Mechanical Engineers Series B 57, no. 534 (1991): 762–67. http://dx.doi.org/10.1299/kikaib.57.762.

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KALKE, Jakub, Marcin OPALIŃSKI, and Paweł MAZURO. "Experimental test stand for development of an opposed-piston engine and initial results." Combustion Engines 169, no. 2 (May 1, 2017): 76–82. http://dx.doi.org/10.19206/ce-2017-213.

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The article presents the reason for developing a 0D predictive and diagnostic model for opposed-piston (OP) engines. Firstly, a description of OP engines, together with their most important advantages and challenges are given together with current research work. Secondly, a PAMAR-4 engine characteristic is presented. After that the proposed 0D predictive model is described and compared with the commercially availible software. Test stand with most important sensors and solutions are presented. After that the custom Engine Control Unit software is characterized together with a 0D diagnostic model. Next part discusses specific challenges that still have to be solved. After that the preliminary test bed results are presented and compared to the 0D simulations. Finally, the summary together with possible future improvement of both 0D predictive model and test bed capabilities are given.

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ALQAHTANI, Ali, Miroslaw WYSZYNSKI, Pawel MAZURO, and Hongming XU. "Evaluation of the effect of variable compression ratios performance on opposed piston 2-stroke engine." Combustion Engines 171, no. 4 (November 1, 2017): 97–106. http://dx.doi.org/10.19206/ce-2017-417.

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Numerous skills involving the introduction of (OP) opposed piston engine have been developed in the recent past. Indeed, novel techniques can help to improve the performance of the engine. The aim of this paper is to model and simulate a simple single-cylinder two-stroke opposed-piston engine and minimise fuel consumption and heat loss, using the software programme AVL BOOST™. AVL BOOST is an engine modelling software, which analyses the performance of a modelled single cylinder two-stroke opposed-piston engine by changing desired parameters. In order to meet this aim, experimental results from a unique engine are used to make a comparison with the results obtained from AVL BOOST model. Six combinations of compression ratios (12, 13.5, 15, 16.5, 18 and 19.5) are analysed in this study with the engine speed running at 420 rpm and 1500 rpm. In addition to the compression ratios, the effect of stroke-to-bore (S/B) ratios on OP2S performance is investigated. Various values of S/B ratios, whilst maintaining a constant swept volume, port geometry and combustion timing, and their effect on fuel consumption and heat loss are analysed in this study. A comparison between the two engine speeds with increasing combinations of compression ratios, and the S/B ratios revealed minimal differences in peak pressure, peak temperature, IMEP, ISFC, indicated efficiency and total heat loss. Detailed analyses of these parameters are highlighted in discrete sections of this paper.

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Gharakhani, Adrin, and Ahmed F. Ghoniem. "3D vortex simulation of flow in an opposed-piston engine." ESAIM: Proceedings 7 (1999): 161–72. http://dx.doi.org/10.1051/proc:1999015.

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Young, Alex G., Aaron W. Costall, Daniel Coren, and James W. G. Turner. "The Effect of Crankshaft Phasing and Port Timing Asymmetry on Opposed-Piston Engine Thermal Efficiency." Energies 14, no. 20 (October 15, 2021): 6696. http://dx.doi.org/10.3390/en14206696.

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Opposed-piston, two-stroke engines reveal degrees of freedom that make them excellent candidates for next generation, highly efficient internal combustion engines for hybrid electric vehicles and power systems. This article reports simulation results that explore the influence of key control and geometrical parameters, specifically crankshaft phasing and intake and exhaust port height-to-stroke ratios, in obtaining best thermal efficiency. A model of a 0.75 L, single-cylinder opposed-piston two-stroke engine is exercised to predict fuel consumption as engine speed, load, crankshaft phasing, intake and exhaust port height-to-stroke ratios, and stoichiometry are varied for medium-duty truck and range extender applications. Under stoichiometric operation, optimal crankshaft phasing is seen at 0–5°, lower than reported in the literature. If stoichiometric operation is not mandated, best fuel consumption is achieved at an air-to-fuel equivalence ratio λ = 1.25 and 5–10° crankshaft phase angle, enabling a ~10 g/kWh (~4%) improvement in average brake-specific fuel consumption across medium-duty truck operating points. In range extender form, the engine provides 30 kW output power in accordance with a survey of range extender engines. In this role, there is a clear distinction between low-speed, high-load operation and vice versa. The decision as to which is more appropriate would be based on minimizing total owning and operating cost, itself a trade-off between better thermal efficiency (and thus lower fuel cost) and greater durability.

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KALKE, Jakub, Mateusz SZCZECIŃSKI, and Paweł MAZURO. "Unsteady conjugated heat transfer in cylinder of highly loaded opposed-piston engine." Combustion Engines 167, no. 4 (October 1, 2016): 64–72. http://dx.doi.org/10.19206/ce-2016-407.

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Paper presents a method of calculating the temperature distribution in cylinder for a 2-stroke, opposed-piston (OP) internal combustion engine (ICE). Development of such machines has been very limited after World War II due to technological and ecological problems [9], therefore progress in numerical modeling for analyzing highly boosted OP engines was also halted. Current technology permits returning to the OP arrangement, where due to better combustion chamber shape it is potentially possible to achieve higher thermodynamic efficiency than in arrangement with the cylinder head [9, 10]. Authors decided to use a general purpose CFD-program (in this case Ansys Fluent) coupled with additional tools to calculate conjugated heat transfer between the load in the cylinder and the cylinder itself to get a 3D temperature distribution in solid body.

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33

Ghautama, Wira, Djoko Herwanto, Lilies Esthi Riyanti, Mursyidin Mursyidin, and Andri Kurniawan. "PENGENALAN TEKNIK DASAR OVERHAUL MESIN PISTON PESAWAT UDARA TIPE OPPOSED UNTUK GURU SMK PENERBANGAN." Darmabakti: Jurnal Inovasi Pengabdian dalam Penerbangan 2, no. 1 (December 31, 2021): 56–64. http://dx.doi.org/10.52989/darmabakti.v2i1.43.

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Abstrak Kegiatan pelatihan ini dilatarbelakangi oleh masih rendahnya jumlah dan kompetensi guru bidang produktif sekolah menengah kejuruan penerbangan. Data pemerintah tahun 2019 memperlihatkan mayoritas postur tenaga pengajarnya masih didominasi oleh kategori bidang normative adaptif atau guru umum, sedangkan guru produktif yang mengajar materi pelajaran sesuai bidang keahliannya masih rendah, pada prosentase di bawah 35%. Dampak dari peningkatan kualitas guru produktif akan mempengaruhi kualitas lulusan SMK Penerbangan, sehingga link and match dengan dunia usaha dan industri penerbangan akan semakin membaik. Di sisi lain, Program Studi TPU PPI Curug dengan AMTO 147, termasuk untuk program perawatan Piston Engine dengan salah satu kegiatan Pendidikan adalah praktik overhaul mesin piston sesuai dengan standar overhaul pabrikan mesin. Sebagai bentuk tanggung jawab pengabdian kepada masyarakat, dosen – dosen memberikan pelatihan dalam bentuk pengenalan dasar overhaul mesin piston sehingga guru – guru produktif dapat memiliki pemahaman dan terampil dalam perawatan mesin piston dengan menggunakan perkakas yang standar. Dengan lokasi kegiatan di SMKN 12 Bandung yang memiliki jurusan Airframe and Powerplant, kegiatan ini dimulai dengan pembekalan konsep overhaul, pengantar penggunaan perkakas standar, regulasi dan cara pembacaan manual dan manufacture technical publication lainnya. Setelah peserta memiliki dasar penguasaan konsep tersebut, kegiatan dilanjutkan dengan pengenalan suku cadang mesin piston dan pelatihan top end overhaul sesuai dengan tujuan pelatihan. Kegiatan diakhiri dengan ujian praktik overhaul untuk mengukur keterampilan peserta. Dengan pelatihan ini diharapkan guru – guru memiliki pemahaman dan keterapilan overhaul mesin piston pesawat yang sesuai dengan manufacture manual dan dapat menungkatkan kualitas ajar bidang produktif yang diajarkannya Kata Kunci : Piston Engine, Airframe and Powerplant, Manufacture Manual

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34

KARPIŃSKI, Paweł. "THE INFLUENCE OF THE INJECTION TIMING ON THE PERFORMANCE OF TWO-STROKE OPPOSED-PISTON DIESEL ENGINE." Applied Computer Science 14, no. 2 (June 30, 2018): 69–81. http://dx.doi.org/10.35784/acs-2018-14.

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The performance of the engine strongly depends on the parameters of the combustion process. In compression ignition engines, the fuel injection timing has a significant influence on this process. The moment of its occurrence and its duration should be chosen so that the maximum pressure value occurs several degrees after TDC. In order to analyze the effect of the fuel injection timing on the performance of the tested two-stroke opposed-piston diesel engine, a zero-dimensional model was developed in the AVL BOOST program. Next, a series of simulations were performed based on the defined calculation points for maximum continuous power, which resulted in power, specific fuel consumption and mean in-cylinder pressure. Finally, the engine map was made as a function of the start of combustion angle.

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35

Liu, Shuangshuang, Zhaoping Xu, Leiming Chen, and Liang Liu. "Comparison of an opposed-piston free-piston engine using single and dual channel uniflow scavenging." Applied Thermal Engineering 201 (January 2022): 117813. http://dx.doi.org/10.1016/j.applthermaleng.2021.117813.

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36

HU, Yong, and Akira HIBI. "Hydraulic free piston internal combustion engine. Outline of the fundamental test apparatus with opposed pistons." Transactions of the Japan Society of Mechanical Engineers Series B 56, no. 525 (1990): 1565–70. http://dx.doi.org/10.1299/kikaib.56.1565.

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37

Mattarelli, Enrico, Giuseppe Cantore, Carlo Alberto Rinaldini, and Tommaso Savioli. "Combustion System Development of an Opposed Piston 2-Stroke Diesel Engine." Energy Procedia 126 (September 2017): 1003–10. http://dx.doi.org/10.1016/j.egypro.2017.08.268.

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38

Tulwin, T., and P. Karpiński. "Analysis of the fuel spray diversity in the opposed-piston engine." Journal of Physics: Conference Series 1101 (October 2018): 012045. http://dx.doi.org/10.1088/1742-6596/1101/1/012045.

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39

SIADKOWSKA, Ksenia, Mirosław WENDEKER, and Łukasz GRABOWSKI. "An investigation of the fuel injector dedicated to the aircraft opposed-piston two-stroke diesel engine." Combustion Engines 177, no. 2 (May 1, 2019): 151–55. http://dx.doi.org/10.19206/ce-2019-227.

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The paper presents the research results of the injector construction with the modified injection nozzle. The injector is designed for a prototype opposed-piston aircraft diesel engine. The measurements were based on the Mie scattering technique. The conditions of the experiment corresponded to maximum loads similar to those occurring at the start. The measuring point was selected in line with the analysis of engine operating conditions: combustion chamber pressure at the moment of fuel delivery (6 MPa) and fuel pressure in the injection rail (140 MPa). The analysis focused on the average spray range and distribution, taking into account the differences between holes in the nozzle. As a result of the conducted research, the fuel spray range was defined with the determined parameters of injection. The fuel spray ranges inside the constant volume chamber at specific injection pressures and in the chamber were examined, and the obtained results were used to verify and optimize the combustion process in the designed opposed-piston two-stroke engine.

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40

Yang, Wei, Fu-kang Ma, Feng Li, and Jun-feng Xu. "Identification and analysis of the factors to realizing variable intake/exhaust phases in opposed-piston two-stroke diesel engines." Advances in Mechanical Engineering 14, no. 6 (June 2022): 168781322211026. http://dx.doi.org/10.1177/16878132221102648.

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The opposed-piston, two-stroke (OP2S) diesel engine is a potential power system to promote thermal efficiency, but the engine has an inferior scavenging performance. Through variable intake/exhaust times, the combustion process can be effectively facilitated. For example, the VVT technology is used in traditional engines. However, this technology has not been applied to OP2S diesel engines. This present work analyzed parameters influencing the intake/exhaust times to find a way to realize variable intake/exhaust times in OP2S diesel engines. These parameters affecting intake/exhaust times were mainly focused on, for example, crank to link ratio (CLR), piston phase difference (PPD), and port height (PH). Through investigating their influence on IMEP, scavenging efficiency, and trapping efficiency, we evaluated the different schemes from performance, intake/exhaust phases, and realization cost. The results show that the PH scheme significantly precedes the PPD and CLR schemes for realizing the variable intake/exhaust times. The PH scheme owns a more extensive phase adjustment range of 31°CA, the IMEP of 0.75 MPa, and the scavenging efficiency of 0.74. To achieve better power and scavenging performance, the EPH should be 37.5% higher than IPH, and the PPD should be kept below 15°CA.

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41

HU, Yong, and Akira HIBI. "Hydraulic free piston internal combustion engine. Experimental investigation on the fundamental test apparatus with opposed piston." Transactions of the Japan Society of Mechanical Engineers Series B 56, no. 530 (1990): 3167–72. http://dx.doi.org/10.1299/kikaib.56.3167.

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42

Lu, Jinkang, Zhaoping Xu, and Liang Liu. "Compression Ratio Control of an Opposed-Piston Free-Piston Engine Generator Based on Artificial Neural Networks." IEEE Access 8 (2020): 107865–75. http://dx.doi.org/10.1109/access.2020.3001273.

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43

Grabowski, Łukasz, Konrad Pietrykowski, and Paweł Karpiński. "Energetic Analysis of the Aircraft Diesel Engine." MATEC Web of Conferences 252 (2019): 05012. http://dx.doi.org/10.1051/matecconf/201925205012.

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The analysis of the distribution of thermal energy generated during the combustion process in internal combustion engines and the estimation of individual losses are important regarding performance and efficiency. The article analyses the energy balance of the designed two-stroke opposed piston diesel engines with offset, i.e. the angle by which the crankshaft at the side of exhaust ports is ahead of the crankshaft at the side of intake ports. Based on the developed zero-dimensional engine model, a series of simulations were performed in steady-state conditions using the AVL BOOST software. The values of individual energy losses, including cooling losses, exhaust gas losses, friction losses were obtained. The influence of decreasing and increasing the offset on the performance of the tested engine was analysed.

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44

Grabowski, Łukasz, Konrad Pietrykowski, and Paweł Karpiński. "Charging process analysis of an opposed-piston two-stroke aircraft Diesel engine." ITM Web of Conferences 15 (2017): 03002. http://dx.doi.org/10.1051/itmconf/20171503002.

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HOSHINO, Takeshi. "A02 Design and fabrication of opposed-piston linear alternator for Stirling engine." Proceedings of the Symposium on Stirlling Cycle 2001.5 (2001): 5–8. http://dx.doi.org/10.1299/jsmessc.2001.5.5.

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Zhang, Zhenyu, Peng Zhang, and Zhenfeng Zhao. "Spray Impingement and Combustion in a Model Opposed-Piston Compression Ignition Engine." Combustion Science and Technology 189, no. 11 (June 13, 2017): 1943–65. http://dx.doi.org/10.1080/00102202.2017.1340278.

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Kozak, Dariusz, and Paweł Mazuro. "Review of Small Gas Turbine Engines and Their Adaptation for Automotive Waste Heat Recovery Systems." International Journal of Turbomachinery, Propulsion and Power 5, no. 2 (April 30, 2020): 8. http://dx.doi.org/10.3390/ijtpp5020008.

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Current commercial and heavy-duty powertrains are geared towards emissions reduction. Energy recovery from exhaust gases has great potential, considering the mechanical work to be transferred back to the engine. For this purpose, an additional turbine can be implemented behind a turbocharger; this solution is called turbocompounding (TC). This paper considers the adaptation of turbine wheels and gearboxes of small turboshaft and turbojet engines into a two-stage TC system for a six-cylinder opposed-piston engine that is currently under development. The initial conditions are presented in the first section, while a comparison between small turboshaft and turbojet engines and their components for TC is presented in the second section. Based on the comparative study, a total number of 7 turbojet and 8 turboshaft engines were considered for the TC unit.

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Ma, Fu-kang, Chang-lu Zhao, Zhen-feng Zhao, and Shuan-lu Zhang. "Scavenge flow analysis of opposed-piston two-stroke engine based on dynamic characteristics." Advances in Mechanical Engineering 7, no. 4 (April 17, 2015): 168781401558156. http://dx.doi.org/10.1177/1687814015581569.

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Hu, Xiaoyu, Qiang Sun, Guoxiang Li, and Shuzhan Bai. "Numerical investigation of thermo-hydraulic performance of an opposed piston opposed cylinder engine water jacket with helical fins." Applied Thermal Engineering 159 (August 2019): 113824. http://dx.doi.org/10.1016/j.applthermaleng.2019.113824.

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Wu, Limin, Huihua Feng, Ziwei Zhang, Zhifeng Tang, Boru Jia, and Xiaodong Yan. "Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results." Energy Reports 7 (November 2021): 4977–87. http://dx.doi.org/10.1016/j.egyr.2021.07.132.

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Journal articles on the topic 'Opposed piston engine'

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