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Experimental analysis of super-knock occurrence based on a spark ignition engine with high compression ratio

Author

Listed:
  • Zhou, Lei
  • Kang, Rui
  • Wei, Haiqiao
  • Feng, Dengquan
  • Hua, Jianxiong
  • Pan, Jiaying
  • Chen, Rui

Abstract

The super-knock phenomenon is a major obstacle for further improving the power density in SI engines. The objective of this paper is to experimentally investigating the mechanism involved in the occurrence of super-knock. In this work, a high compression ratio (CR = 13) coupled with advanced spark timings were employed to achieving intense or critical thermal-dynamic conditions to easily inducing the super-knock. The results show that super-knock can originate from spark ignition, which is different from previous results regarding pre-ignition. Changing the spark timing super-knock can be induced with very high pressure oscillation at the present high compression ratio. The high compression ratio could generate sufficiently high thermal-dynamic conditions to inducing the abnormal combustion. In this research, four combustion phenomena were observed. The present work indicates that there is a nonlinear relationship between knock intensity and knocking onset in terms of pressure profiles at different cycles. The super-knock or knock phenomena were dominantly induced by spark ignition, which were controlled by the pre-ignition after several cycles. Finally, the analysis of the mechanism of super-knock with severe pressure oscillation was employed based on the thermal explosion theory and cavity resonances. There are two possible auto-ignition combustion modes that can induce the intense pressure oscillation.

Suggested Citation

  • Zhou, Lei & Kang, Rui & Wei, Haiqiao & Feng, Dengquan & Hua, Jianxiong & Pan, Jiaying & Chen, Rui, 2018. "Experimental analysis of super-knock occurrence based on a spark ignition engine with high compression ratio," Energy, Elsevier, vol. 165(PB), pages 68-75.
    • Handle: RePEc:eee:energy:v:165:y:2018:i:pb:p:68-75
    DOI: 10.1016/j.energy.2018.09.166
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    References listed on IDEAS

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    Cited by:

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    2. Meng, Hao & Ji, Changwei & Su, Teng & Yang, Jinxin & Chang, Ke & Xin, Gu & Wang, Shuofeng, 2022. "Analyzing characteristics of knock in a hydrogen-fueled Wankel rotary engine," Energy, Elsevier, vol. 250(C).
    3. Zhen, Xudong & Tian, Zhi & Wang, Yang & Xu, Meng & Liu, Daming & Li, Xiaoyan, 2022. "Knock analysis of bio-butanol in TISI engine based on chemical reaction kinetics," Energy, Elsevier, vol. 239(PC).
    4. Shi, Hao & Uddeen, Kalim & An, Yanzhao & Pei, Yiqiang & Johansson, Bengt, 2021. "Multiple spark plugs coupled with pressure sensors: A new approach for knock mechanism study on SI engines," Energy, Elsevier, vol. 227(C).
    5. 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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