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Study on the effect of low carbon alcohol gasoline stratified injection strategy on engine knock combustion under lean burn conditions

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  • Ma, Ruixiu
  • Feng, Hongqing
  • Zhang, Shuo
  • Wang, Lin
  • Niu, Zhenze
  • Chen, Xiaofan

Abstract

This paper focuses on the "oxygenated fuel concentration stratified lean burn to improve combustion and thermal efficiency" as a starting point and investigates the effects of combustion of high-octane oxygenated fuels in gasoline engines under overall lean burn conditions by using different injection strategies on the performance and knock combustion. The study shows that: the flame during the knock shows the characteristics of spontaneous combustion flame and normal flame collision along the cylinder wall propagation alternately, followed by local deflagration and auto-ignition point to the center of the cylinder, and then turned to the center of the surrounding flow of disordered stacked high-speed fluctuations. Combustion under concentration stratification manifests phase lag, with heat release characterized by either a single-peak continuous pattern or a double-peak staged pattern, which interchange dynamically. The single-variable method was used to obtain the optimal working condition for concentration stratification: n-butanol volume ratio of 15 %, secondary injection moment of 150°CA BTDC and injection ratio of 15 %, which improves the thermal efficiency by about 3.2 % and reduces the intensity of knock by about 20.7 %. When the proportion of ethanol replacement increases, the thermal efficiency maximum increase is about 5.2 %, but the knock situation tends to be serious.

Suggested Citation

  • Ma, Ruixiu & Feng, Hongqing & Zhang, Shuo & Wang, Lin & Niu, Zhenze & Chen, Xiaofan, 2024. "Study on the effect of low carbon alcohol gasoline stratified injection strategy on engine knock combustion under lean burn conditions," Energy, Elsevier, vol. 313(C).
    • Handle: RePEc:eee:energy:v:313:y:2024:i:c:s0360544224034947
    DOI: 10.1016/j.energy.2024.133716
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    References listed on IDEAS

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    1. Feng, Hongqing & Suo, Xinghan & Xiao, Shuwen & Chen, Xiaofan & Zhang, Zhisong & Gao, Ning & Zheng, Zunqing, 2023. "Numerical simulation on the effects of n-butanol combined with intake dilution on engine knock," Energy, Elsevier, vol. 271(C).
    2. Zhuang, Yuan & Zhu, Guodong & Gong, Zhen & Wang, Chenfang & Huang, Yuhan, 2019. "Experimental and numerical investigation of performance of an ethanol-gasoline dual-injection engine," Energy, Elsevier, vol. 186(C).
    3. Trindade, Wagner Roberto da Silva & Santos, Rogério Gonçalves dos, 2017. "Review on the characteristics of butanol, its production and use as fuel in internal combustion engines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 642-651.
    4. Han, Taehoon & Singh, Ripudaman & Lavoie, George & Wooldridge, Margaret & Boehman, André, 2020. "Multiple injection for improving knock, gaseous and particulate matter emissions in direct injection SI engines," Applied Energy, Elsevier, vol. 262(C).
    5. Pan, Jiaying & Wei, Haiqiao & Shu, Gequn & Pan, Mingzhang & Feng, Dengquan & Li, Nan, 2017. "LES analysis for auto-ignition induced abnormal combustion based on a downsized SI engine," Applied Energy, Elsevier, vol. 191(C), pages 183-192.
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