Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine

Ao Zhou, Hui Jin, Wenhan Cao, Ming Pang, Yangyang Li and Chao Zhu
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Ao Zhou: School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Hui Jin: School of Automotive Engineering, Lanzhou Institute of Technology, Lanzhou 730050, China
Wenhan Cao: School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Ming Pang: School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Yangyang Li: Shaanxi Key Laboratory of Development and Application of New Transportation Energy, Chang’an University, Xi’an 710064, China
Chao Zhu: State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China

Energies, 2022, vol. 15, issue 10, 1-14

Abstract: An experimental study regarding methanol–diesel dual-fuel (DF) engines was conducted on a modified engine to explore the effects of pilot injection timing and period on the two-stage combustion process caused by the pilot injection strategy. In this study, the two-stage combustion process was determined according to the first two peaks of the second derivative of an in-cylinder pressure ( d 2 p / dφ 2 ) curve. The results show that the peak pressure rise rate ( PRR ) tended to decrease with advancing pilot injection timing at a high co-combustion ratio ( CCR ), which reduced combustion noise. The start of the combustion of the main injection diesel (SOC2) could be advanced by increasing the pilot injection period or advancing pilot injection timing at a 42% CCR. At an 18% CCR, the pilot injection timing and period had no significant effect on SOC2. With the advancement of pilot injection timing, the start of the combustion of pilot injection diesel (SOC1) advanced, and generally, the coefficient of variation of the PRR ( COV PRR ) of the two-stage combustion process increased first and then decreased. However, with the increase in the pilot injection period, SOC1 almost always remained constant and the COV PRR of the two-stage combustion process generally increased.

Keywords: methanol–diesel DF; pilot injection timing; pilot injection period; combustion characteristic; SOC1; SOC2; two-stage combustion 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
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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