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Proper orthogonal decomposition for energy convergence of shock waves under severe knock

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  • Xu, Han
  • Yao, Anren
  • Yao, Chunde
  • Gao, Jian

Abstract

Under severe knocks of internal combustion engines, parts like pistons and spark plugs are vulnerable to be damaged by energy convergence of shock waves. Furthermore, the damaged positions and failure modes have a significant regularity. In order to reveal the mechanism and avoid such damage, numerical simulations combined with detonation bomb experiments were conducted to explore the energy convergence phenomenon. Proper orthogonal decomposition was developed to extract the main pressure distributions so that the positions where energy converges can be found and the convergence modes can be recognized. Results show that energy convergence could occur in combustion chambers when severe knocks occurred. The spark plug, central region and edge region of a piston are in typical positions where energy converges. In addition, the position and intensity of such convergence are varied with the chamber shapes. The damaged samples further prove that the engine parts failure is caused by the energy convergence of shock waves. It's shown that the proper orthogonal decomposition is a simple and efficient method to identify the convergence modes and find the convergence positions. This research can provide a theoretical basis for the chamber design to avoid energy convergence as well as the destruction under severe knock.

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  • Xu, Han & Yao, Anren & Yao, Chunde & Gao, Jian, 2017. "Proper orthogonal decomposition for energy convergence of shock waves under severe knock," Energy, Elsevier, vol. 128(C), pages 813-829.
    • Handle: RePEc:eee:energy:v:128:y:2017:i:c:p:813-829
    DOI: 10.1016/j.energy.2017.04.019
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    References listed on IDEAS

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    1. Xu, Han & Yao, Anren & Yao, Chunde & Gao, Jian, 2017. "Investigation of energy transformation and damage effect under severe knock of engines," Applied Energy, Elsevier, vol. 203(C), pages 506-521.
    2. 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.
    3. Chen, Lin & Pan, Jiaying & Liu, Changwen & Shu, Gequn & Wei, Haiqiao, 2020. "Effect of rapid combustion on engine performance and knocking characteristics under different spark strategy conditions," Energy, Elsevier, vol. 192(C).
    4. 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).
    5. 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.
    6. 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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