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Effect of dilution strategies on the performance and knocking in a spark induced compression ignition (SICI) engine for isopropanol-butanol-ethanol (IBE) blends

Author

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  • Meng, Xianglong
  • Xie, Fangxi
  • Liu, Yu
  • Lai, Kaichang
  • Jiang, Xiaoxiao
  • Jiang, Beiping
  • Zhao, Jinghua
  • Dou, Huili

Abstract

To attain carbon neutrality goals, enhancing the thermal efficiency of engines and application of carbon-neutral fuels is essential. The renewability and low emissions of alcohols are receiving increasing attention, and spark induced compression ignition (SICI) is a high-efficient combustion mode. However, issues such as knocking limit the application of SICI engines. The diluted composition and dilution level are key factors affecting the SICI combustion and knocking. This paper designs 16 dilution strategies to explore the effects of different strategies on the performance and knocking of SICI. It was observed that the combination of fresh air and internal EGR (i-EGR) significantly improved the average maximum amplitude of pressure oscillations (MAPO) and in-cylinder pressure. Regardless of the dilution level (∅dilution), the combination of external EGR (e-EGR) and i-EGR significantly reduced the average MAPO and maximum pressure. After optimizing ignition timing, the degree of auto-ignition decreased with the increase of isopropanol content in IBE. BSCO emissions were lowest when fueled with n-butanol. The combination of e-EGR and i-EGR significantly reduced the BSNOx emissions of all IBE blends. When ∅dilution = 22.15 %, the combination of e-EGR and i-EGR resulted in a reduction of BSNOx emissions for n-butanol, IBE361, and IBE631 by 3.87 %, 53.71 %, and 46.52 %, respectively.

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  • Meng, Xianglong & Xie, Fangxi & Liu, Yu & Lai, Kaichang & Jiang, Xiaoxiao & Jiang, Beiping & Zhao, Jinghua & Dou, Huili, 2025. "Effect of dilution strategies on the performance and knocking in a spark induced compression ignition (SICI) engine for isopropanol-butanol-ethanol (IBE) blends," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225005833
    DOI: 10.1016/j.energy.2025.134941
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