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Effects of hydrogen addition and exhaust gas recirculation on thermodynamics and emissions of ultra-high compression ratio spark ignition engine fueled with liquid methane

Author

Listed:
  • Wan, Shuai
  • Zhou, Feng
  • Fu, Jianqin
  • Yu, Juan
  • Liu, Jingping
  • Abdellatief, Tamer M.M.
  • Duan, Xiongbo

Abstract

This study focuses on exploring the potential of using liquid methane gas in engines by examining the combustion, thermodynamics, and emissions characteristics of a high compression ratio (CR) liquid methane engine. This is accomplished by combining experimental and simulation methods to integrate exhaust gas recirculation (EGR) technology and hydrogen addition. The results demonstrate that hydrogen addition can enhance indicated thermal efficiency and combustion completeness, but excessive hydrogen addition at extremely high CR levels may lead to increased knocking tendencies and a slight deterioration in combustion phase. In addition, the 50 % combustion location was maintained at 7.1 °CA between the optimal combustion periods of 8–12°CA with better heat-work conversion efficiency under the strategy of EGR 16 % and hydrogen energy fraction (HEF) 12 %. Last, the optimal strategy of 15.6 for CR, 12 % for HEF, and 16 % for EGR was obtained, which provided a better balance of engine performance, efficiency, and emission. The indicated thermal efficiency reached 47.23 %, and 4 % higher than the average of the strategies, indicating optimal combustion phasing and knocking performance. This study provides a more detailed optimization direction for natural gas engine and identifies an optimal strategy with excellent performance in all aspects of CR, EGR, and HEF.

Suggested Citation

  • Wan, Shuai & Zhou, Feng & Fu, Jianqin & Yu, Juan & Liu, Jingping & Abdellatief, Tamer M.M. & Duan, Xiongbo, 2024. "Effects of hydrogen addition and exhaust gas recirculation on thermodynamics and emissions of ultra-high compression ratio spark ignition engine fueled with liquid methane," Energy, Elsevier, vol. 306(C).
    • Handle: RePEc:eee:energy:v:306:y:2024:i:c:s0360544224022254
    DOI: 10.1016/j.energy.2024.132451
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