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Energies 2017, 10(3), 368; doi:10.3390/en10030368

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

1
School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
2
School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Academic Editor: Chang Sik Lee
Received: 20 December 2016 / Revised: 6 March 2017 / Accepted: 10 March 2017 / Published: 15 March 2017
View Full-Text   |   Download PDF [4277 KB, uploaded 16 March 2017]   |  

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. View Full-Text
Keywords: opposed-piston two-stroke; scavenging process; indicated mean effective pressure (IMEP); optimization opposed-piston two-stroke; scavenging process; indicated mean effective pressure (IMEP); optimization
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MDPI and ACS Style

Ma, F.-K.; Wang, J.; Feng, Y.-N.; Zhang, Y.-G.; Su, T.-X.; Zhang, Y.; Liu, Y.-H. Parameter Optimization on the Uniflow Scavenging System of an OP2S-GDI Engine Based on Indicated Mean Effective Pressure (IMEP). Energies 2017, 10, 368.

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