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Numerical Study of Knocking Combustion in a Heavy-Duty Engine under Plateau Conditions

Author

Listed:
  • Haiying Li

    (China North Engine Research Institute, Tianjin 300400, China)

  • Xiaoqin Zhang

    (China North Engine Research Institute, Tianjin 300400, China
    These authors contributed equally to this work.)

  • Chaofan Li

    (China North Engine Research Institute, Tianjin 300400, China
    These authors contributed equally to this work.)

  • Rulou Cao

    (China North Engine Research Institute, Tianjin 300400, China
    These authors contributed equally to this work.)

  • Weiqing Zhu

    (China North Engine Research Institute, Tianjin 300400, China
    These authors contributed equally to this work.)

  • Yaozong Li

    (China North Engine Research Institute, Tianjin 300400, China
    These authors contributed equally to this work.)

  • Fengchun Liu

    (China North Engine Research Institute, Tianjin 300400, China
    These authors contributed equally to this work.)

  • Yufeng Li

    (China North Engine Research Institute, Tianjin 300400, China
    These authors contributed equally to this work.)

Abstract

Diesel engine combustion becomes very rough and can lead even lead to deflagration under high altitude conditions, which is harmful to component durability. In this study, the effects of altitude on the main combustion characteristics—in-cylinder fluid flow, spray behavior, and pressure and temperature distribution—were analyzed with CFD. A numerical model was built on the CONVERGE platform and validated with the optical spray behavior and pressure trace measured by the test bench. The simulation results indicated that the decreases in compression pressure and temperature at 4.5 km led to an over 4 °CA longer ignition delay than those of 1 and 3 km. The combustion efficiency decreased from 90% to 47% when the combustion changed from normal combustion to knocking combustion due to severe spray impingement. The processes of end-gas ignition, sequential combustion, and pressure oscillation in knocking combustion were revealed by the numerical modeling results. These results indicate that super-knocking combustion exists in both spark-ignition (SI) engines and compression-ignition (CI) engines.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3083-:d:800174
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    References listed on IDEAS

    as
    1. Kan, Zechao & Hu, Zhiyuan & Lou, Diming & Tan, Piqiang & Cao, Zhiyi & Yang, Zhenhuan, 2018. "Effects of altitude on combustion and ignition characteristics of speed-up period during cold start in a diesel engine," Energy, Elsevier, vol. 150(C), pages 164-175.
    2. 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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