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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Ao Zhou & Hui Jin & Wenhan Cao & Ming Pang & Yangyang Li & Chao Zhu, 2022. "Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine," Energies, MDPI, vol. 15(10), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3578-:d:814992
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