Experimental Investigation of Combustion Characteristics on Opposed Piston Two-Stroke Gasoline Direct Injection Engine

Fukang Ma, Wei Yang, Junfeng Xu, Yufeng Li, Zhenfeng Zhao, Zhenyu Zhang and Yifang Wang
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Fukang Ma: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China
Wei Yang: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China
Junfeng Xu: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China
Yufeng Li: China North Engine Research Institute, Yong Jin Road No.96, Tianjin 300400, China
Zhenfeng Zhao: School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Zhongguancun South Street No.5, Beijing 100081, China
Zhenyu Zhang: School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Zhongguancun South Street No.5, Beijing 100081, China
Yifang Wang: School of Energy and Power Engineering, North University of China, University Road No.3, Taiyuan 030051, China

Energies, 2021, vol. 14, issue 8, 1-23

Abstract: The combustion characteristics of an opposed-piston two-stroke gasoline engine are investigated with experiment. The energy conversion and exergy destruction are analyzed and the organization method of the combustion process is summarized. The effects of phase difference, scavenging pressure, injection timing, ignition timing, and dual spark plug ignition scheme on the combustion process and engine performance are discussed, respectively. The heat release rate of the opposed-piston two-stroke gasoline engine is consistent with the conventional gasoline engine. With the increase of opposed-piston motion phase difference, the scavenging efficiency decreases and overmuch residual exhaust gas is not beneficial to the combustion process. Meanwhile, the faster relative velocity of the opposed-piston near the inner dead center enhances the cylinder working volume change rate, which leads to the rapid decline of in-cylinder pressure and temperature. The 15 °CA of opposed-piston motion phase difference improves the scavenging and combustion process effectively. When scavenging pressure is 0.12 MPa, the scavenging efficiency and heat release rate are improved at medium-high speed conditions. With the delay of injection timing, the flame developing period decreases gradually, and the rapid burning period decreases and then increases. The rapid burning period may reach the minimum value when the injection advance angle is 100 °CA. With the delay of ignition timing, the flame developing period increases gradually, and the rapid combustion period decreases and then increases. The rapid combustion period may reach the minimum value when the ignition advance angle is 20 °CA. Notably, the flat-top piston structure should be matched with the dual spark plug, which the ignition advance angle is 20 °CA at medium-high load conditions.

Keywords: opposed piston two stroke gasoline engine; combustion characteristics; phase difference; scavenging pressure; injection timing; ignition timing (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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