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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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    5. Haiying Li & Xiaoqin Zhang & Chaofan Li & Rulou Cao & Weiqing Zhu & Yaozong Li & Fengchun Liu & Yufeng Li, 2022. "Numerical Study of Knocking Combustion in a Heavy-Duty Engine under Plateau Conditions," Energies, MDPI, vol. 15(9), pages 1-18, April.
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    7. Zou, Run & Li, Yuan & Liu, Jinxiang & Wang, Nana & Zeng, Qinghan & Li, Jiong, 2023. "Numerical study on the effects of spark strategies on knocking combustion in a downsized gasoline rotary engine," Energy, Elsevier, vol. 263(PD).
    8. Lei, Jian & Chai, Sen & Tian, Guohong & Liu, Hua & Yang, Xiyu & Shi, Cheng, 2024. "Understanding the role of methanol as a blended fuel on combustion behavior for rotary engine operations," Energy, Elsevier, vol. 307(C).
    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).
    10. Xu, Han & Gao, Jian & Yao, Anren & Yao, Chunde, 2018. "The effect of the energy convergence and energy dissipation on the formation of severe knock," Applied Energy, Elsevier, vol. 228(C), pages 1243-1254.
    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.
    12. Ji, Feifan & Meng, Shuo & Han, Zhiyu & Dong, Guangyu & Reitz, Rolf D., 2025. "Progress in knock combustion modeling of spark ignition engines," Applied Energy, Elsevier, vol. 378(PB).

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