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LES analysis for auto-ignition induced abnormal combustion based on a downsized SI engine

Author

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  • Pan, Jiaying
  • Wei, Haiqiao
  • Shu, Gequn
  • Pan, Mingzhang
  • Feng, Dengquan
  • Li, Nan

Abstract

Engine knock and super-knock have become the main barriers to significantly improving engine thermal efficiency. To further study the nature of the abnormal combustion, this work quantitatively investigates engine knock and super-knock using a Large Eddy Simulation framework coupling detailed chemistry solver. Firstly, classical knocking cycles with different knocking intensities have been calculated through adjusting spark-ignition timing. It shows that knocking onset and intensity vary proportionally with the advance of spark-ignition timing, however, super-knock events are not observed under the operation conditions. Then for a given spark-ignition timing, the blends of Primary Reference Fuels are introduced in order to obtain different octane number of mixture, through which super-knock events with stronger knocking intensity are observed. The results show that as the decreases of octane number, knocking onset is significantly advanced due to the enhancement of low-temperature chemical reactivity. Consequently, more auto-ignition centers appear at hot exhaust valve side and even cool intake valve side at very low octane number. But for the knocking intensity, it does not always show a proportional correlation with octane number during super-knock. Further auto-ignition scenarios show that developing detonation wave can be induced by both multiple hot-spots auto-ignition and directly by single hot-spot auto-ignition, with different reaction front curvatures. However, the later seems to produce much stronger knocking intensity, especially when there are several developing detonation waves during super-knock. Therefore, how to effectively regulate local auto-ignition initiation and development seems the key to the avoidance of abnormal combustion in modern engines.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:191:y:2017:i:c:p:183-192
    DOI: 10.1016/j.apenergy.2017.01.044
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    References listed on IDEAS

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    9. Xu, Han & Weng, Chunsheng & Gao, Jian & Yao, Chunde, 2020. "The effect of energy intensification on the formation of severe knock in internal combustion engines," Applied Energy, Elsevier, vol. 266(C).
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    11. Chen, Lin & Wei, Haiqiao & Chen, Ceyuan & Feng, Dengquan & Zhou, Lei & Pan, Jiaying, 2019. "Numerical investigations on the effects of turbulence intensity on knocking combustion in a downsized gasoline engine," Energy, Elsevier, vol. 166(C), pages 318-325.

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