Parameter Optimization on the Uniflow Scavenging System of an OP2S-GDI Engine Based on Indicated Mean Effective Pressure (IMEP)

Fu-Kang Ma, Jun Wang, Yao-Nan Feng, Yan-Gang Zhang, Tie-Xiong Su, Yi Zhang and Yu-Hang Liu
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Fu-Kang Ma: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Jun Wang: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Yao-Nan Feng: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Yan-Gang Zhang: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Tie-Xiong Su: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Yi Zhang: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Yu-Hang Liu: School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Beijing 100081, China

Energies, 2017, vol. 10, issue 3, 1-20

Abstract: In this paper, an opposed-piston two-stroke (OP2S) gasoline direct injection (GDI) engine is introduced and its working principles and scavenging process were analyzed. An optimization function was established to optimize the scavenging system parameters, include intake port height, exhaust port height, intake port circumference ratio, the exhaust port circumference ratio and opposed-piston motion phase difference. The effect of the port height on the effective compression ratio and effective expansion ratio were considered, and indicated mean effective pressure (IMEP) was employed as the optimization objective instead of scavenging efficiency. Orthogonal experiments were employed to reduce the calculation work. The effect of the scavenging parameters on delivery ratio, trapping ratio, scavenging efficiency and indicated thermal efficiency were calculated, and the best parameters were also obtained by the optimization function. The results show that IMEP can be used as the optimization objective in the uniflow scavenging system; intake port height is the main factor to the delivery ratio, while exhaust port height is the main to engine trapping ratio, scavenging efficiency and indicated thermal efficiency; exhaust port height is the most important factor to effect the gas exchange process of OP2S-GDI engine.

Keywords: opposed-piston two-stroke; scavenging process; indicated mean effective pressure (IMEP); optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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