Influence of the Port Height to Stroke Ratio on the Performance of an OP2S Engine Fueled with Methanol/Diesel

Wei Yang, Feng Li, Fukang Ma, Dan Xu, Junfeng Xu and Fang Wang
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Wei Yang: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China
Feng Li: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China
Fukang Ma: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China
Dan Xu: China North Engine Research Institute (Tianjin), Tianjin 300400, China
Junfeng Xu: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China
Fang Wang: Shanxi Diesel Engine Industry Corporation, Ltd., Datong 037036, China

Energies, 2022, vol. 15, issue 6, 1-12

Abstract: Zero carbon emission is a mainstream trend in the development of internal combustion engines (ICEs) in the future. ICEs need to constantly surpass the existing working mechanism, especially in order to explore the possibility of new combustion methods. Dual-fuel combustion is a good way to reduce carbon emissions and achieve clean combustion. However, the traditional internal combustion engine is limited by its own structure, restricting its performance improvement. The opposed-piston, two-stroke (OP2S) diesel engine is a potential power system with a high degree of structural adjustability. Therefore, this work attempted to apply methanol/diesel dual-fuel to OP2S engines in order to explore efficient and clean combustion modes in the future. In this work, a one-dimensional simulation model of an OP2S diesel engine was established and verified. The effect of the port height to stroke ratio on the performance of the OP2S diesel engine was mainly studied for different methanol blending ratios. The results show that the methanol blending ratio does not affect the port height to stroke ratio where the optimal values of the MIP and scavenging efficiency appear. The optimal methanol blending ratio for the power performance of OP2S diesel engines is 5~15%. There is a trade-off relationship between the MIP/scavenging efficiency and trapping efficiency. For the optimization of an OP2S methanol–diesel engine, priority should be given to ensuring an optimal MIP and scavenging efficiency, and then to the appropriate consideration of the trapping efficiency.

Keywords: opposed-piston two-stroke; methanol/diesel duel-fuel; height to stroke ratio of ports; scavenging process (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: 2022
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