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Improvement of Working Parameters in an Opposed Piston CI Two-Stroke Engine by Modelling Research
Technical Paper
2020-01-2062
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Two-stroke opposed piston engines (2sOPEs) have great potential for industrial applications due to their simple design, technology and high efficiency, particularly with a turbocharging system. The paper presents possibilities for altering 2sOPE working parameters by changing geometrical parameters and boosting parameters. Obtaining higher engine efficiency is realised by altering the crank phase shift of the exhaust piston in relation to the transfer piston. It has been assumed that only the piston of the exhaust cylinder changes its position relative to the piston in the cylinder with transfer ports. Modifying the scavenging process by changing pistons’ position through connecting with two crankshafts enables asymmetrical scavenging timing. Closing the exhaust ports before the compression process and extending the time allotted to empty exhaust gases from the cylinder provides greater engine work, and a high boost ratio increases engine power. This type of engine was recently recommended for power plant stations. The paper includes mathematical modelling of thermodynamic parameters of 2sOPE and full analysis of engine work with scavenging and combustion processes for different timing phases. This endeavour is based on the geometry of the compression ignition Leyland L60 engine and uses the author’s own 0-1-D computer program and considering unsteady gas flow and computational fluid dynamics (CFD) modelling. Simulation tests indicate a high scavenging efficiency, good penetration of injected fuel and fast combustion process. The work contains figures of pressure, temperature traces and emissions of the main chemical species in exhaust gases, with comparisons of engine works for different timing phases. Applying a non-symmetrical scavenging process in a 2sOPE by closing exhaust ports earlier increases working parameters. Despite a shorter expansion time, the expansion work of this engine is larger when the exhaust port is opened earlier rather than later. A 2sOPE with earlier opening of exhaust ports decreases nitric oxide emission due to a lower combustion temperature. This study is a contribution for the future realisation of such processes in power plant engines with different fuelling systems
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Mitianiec, W., "Improvement of Working Parameters in an Opposed Piston CI Two-Stroke Engine by Modelling Research," SAE Technical Paper 2020-01-2062, 2020, https://doi.org/10.4271/2020-01-2062.Data Sets - Support Documents
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References
- Blair , G.P. Design and Simulation of Two-Stroke Engines Warrendale, PA SAE International 1996 978-1-56091-685-7
- Boretti , A. , and Jiang , S. Development of a Two-Stroke Direct Injection Jet Ignition Compressed Natural Gas Engine Journal of Power Technologies 94 3 145 152 2014 http://papers.itc.pw.edu.pl/index.php/JPT/article/view/458/599
- Mitianiec , W. Fundamentals of Fuel Injection and Emission in Two-Stroke Engines New York Nova Science Publishers 2018 978-1-53612-472-9
- Regner , G. , Fromm , L. , Johnson , D. , Koszewnik , J. et al. Modernizing the Opposed Piston Two-Stroke Diesel Engine for More Efficient Commercial Vehicle Applications SAE Technical Paper 2013-26-0114 2013 https://doi.org/10.4271/2013-26-0114
- Foster , D. , Herold , R. , Lemke , J. , Regner , G. et al. Thermodynamic Benefits of Opposed-Piston Two-Stroke Engines SAE Technical Paper 2011-01-2216 2011 https://doi.org/10.4271/2011-01-2216
- Fromm , L. , Herold , R. , Koszewnik , J. , and Regner , G. Modernizing the Opposed-Piston Engine for More Efficient Military Ground Vehicle Application 2012 NDIA Ground Vehicle Systems Engineering and Technology Symposium 2012
- Flint , M. , and Pirault , J.P. Opposed Piston Engines: Evolution, Use, and Future Applications Warrendale, PA SAE International 2009 978-0-7680-1800-4
- Heywood , J. Internal Combustion Engine Fundamentals New York McGraw-Hill 1988 978-0070286375
- Ebrahimi , R. Thermodynamic Modeling of an Atkinson Cycle with Respect to Relative Air-Fuel Ratio, Fuel Mass Flow Rate and Residual Gases Acta Physica Polonica A 124 1 29 34 2013 10.12693/APhysPolA.124.29
- Mitianiec , W. Study of Atkinson Cycle in Two-Stroke Diesel Engine with Opposed Pistons Combustion Engines 178 3 120 127 2019 10.19206/CE-2019-112
- Mitianiec , W. , and Jaroszewski , A. Modele matematyczne procesów fizycznych w silnikach spalinowych małej mocy [Mathematical Models of Physical Processes in Small Power Engines] Krakow Ossolineum 1993
- Chen , C. , and Veshagh , A. A Comparison Between Alternating Methods for Gas Flow and Performance Prediction of Internal Combustion Engines SAE Technical Paper 921734 1992 https://doi.org/10.4271/921734
- Courant , R. , Friedrichs , K. , and Lewy , H. Über die partiellen Differenzengleichungen der mathematischen Physik [Consideration of Partial Differential Equations in Mathematical Physics] Mathematische Annalen 100 1 32 74 1928
- Woschni , G. Experimentalle Untersuchung des Warmeflusses in Kolben und Zylinderbuchse eines schnelllaufenden Dieselmotors [Experimental Test of Heat Transfer in Piston and Cylinder Sleeve in a High-Speed Diesel Engine] Motortechnische Zeitschrift (MTZ) 39 12 1978
- Hardenberg , H.O. , and Hase , F.W. An Empirical Formula for Computing the Pressure Rise Delay of a Fuel from Its Cetane Number and from the Relevant Parameters of Direct-Injection Diesel Engines SAE Technical Paper 790493 1981 https://doi.org/10.4271/790493
- Wiebe , I.I. Progress in Engine Cycle Analysis: Combustion Rate and Cycle Processes Mashgiz, Ural-Siberia Branch 1962 271
- Miyamoto , N. , Chikahisa , T. , Murayama , T. , and Sawyer , R. Description and Analysis of Diesel Engine Rate of Combustion and Performance Using Wiebe’s Functions SAE Technical Paper 850107 1985 https://doi.org/10.4271/850107
- Kamaldtinov , V.G. , Markov , V.A. , and Lysov , I.O. Determining Parameters of Double Wiebe Function for Simulation of Combustion Process in Overload Diesel Engine with Common Rail Fuel Feed System IOP Conference Series: Materials Science and Engineering 327 022053 2018 10.1088/1757-899X/327/2/022053
- Mitianiec , W. Improvements of Crankcase Delivery Ratio in Two-Stroke Engines with Volume Intake System SAE Technical Paper 1999-01-3334 1999 https://doi.org/10.4271/1999-01-3334
- Amsden , A.A. , Butler , T. , O’Rourke , P. , and Ramshaw , J. KIVA: A Comprehensive Model for 2-D and 3-D Engine Simulations SAE Technical Paper 850554 1985 https://doi.org/10.4271/850554
- Mitianiec , W. Pneumatyczny system zasilania silnika dwusuwowego o zapłonie iskrowym [Pneumatic Fuelling System of Spark Ignition Two-Stroke Engine] Krakow Cracow University of Technology, Mechanics 2005