Simulation Modeling Method and Experimental Investigation on the Uniflow Scavenging System of an Opposed-Piston Folded-Cranktrain Diesel Engine

Fukang Ma, Zhenfeng Zhao, Yangang Zhang, Jun Wang, Yaonan Feng, Tiexiong Su, Yi Zhang and Yuhang Liu
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Fukang Ma: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Zhenfeng Zhao: School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Beijing 100081, China
Yangang Zhang: 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
Yaonan Feng: School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China
Tiexiong 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
Yuhang Liu: School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Beijing 100081, China

Energies, 2017, vol. 10, issue 5, 1-18

Abstract: The scavenging process for opposed-piston folded-cranktrain (OPFC) diesel engines can be described by the time evolution of the in-cylinder and exhaust chamber residual gas rates. The relation curve of in-cylinder and exhaust chamber residual gas rate is called scavenging profile, which is calculated through the changes of in-cylinder and exhaust chamber gas compositions determined by computational fluid dynamics (CFD) simulation. The scavenging profile is used to calculate the scavenging process by mono-dimensional (1D) simulation. The tracer gas method (TGM) is employed to validate the accuracy of the scavenging profile. At the same time, the gas exchange performance under different intake and exhaust state parameters was examined based on the TGM. The results show that the scavenging process from 1D simulation and experiment match well, which means the scavenging model obtained by CFD simulation performs well and validation of its effectiveness by TGM is possible. The difference between intake and exhaust pressure has a significant positive effect on the gas exchange performance and trapped gas mass, but the pressure difference has little effect on the scavenging efficiency and the trapped air mass if the delivery ratio exceeds 1.4.

Keywords: opposed-piston folded-cranktrain (OPFC) diesel engine; uniflow scavenging system; validation method; tracer gas method; computational fluid dynamics (CFD) (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 (4)

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