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Operation strategy optimization of lean combustion using turbulent jet ignition at different engine loads

Author

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  • Hua, Jianxiong
  • Song, Yuntong
  • Zhou, Lei
  • Liu, Fengnian
  • Wei, Haiqiao

Abstract

Turbulent jet ignition is an important method to achieve lean combustion in spark ignition engines by using a pre-chamber to ensure reliable ignition and a high burning rate. In this work, a TJI device is designed with additional fuel supply in the pre-chamber, the combustion characteristics of TJI are analyzed, and its operation strategy optimization over wide engine loads is performed on a single-cylinder engine. The results show that a stable combustion process with an excess air coefficient in the range of 1.0–2.2 is achieved, reducing the fuel consumption rate by up to 9.6% under a part load compared with that of the baseline engine. However, under high loads, lean combustion cannot effectively maintain the required power output, and under low loads, excessive lean combustion results in a significant reduction in the combustion efficiency. Therefore, a technical solution involving different intake strategies for different loads, including intake boost, Miller cycle, throttle adjustment, and negative valve overlap, is proposed to flexibly regulate the air/fuel ratio and maintain the in-cylinder excess air coefficient in the optimal range (1.5–2.0). The results show that the fuel consumption rate of boosted lean combustion strategy is reduced by 10–12.5% under high loads compared with that of the baseline engine. Under medium-to-low loads, a reasonable intake strategy reduces the intake air mass and helps avoid excessive lean combustion, and the fuel consumption can be reduced by more than 9.6%. The present work demonstrates the potential of TJI application to enhance the thermal efficiency through lean combustion.

Suggested Citation

  • Hua, Jianxiong & Song, Yuntong & Zhou, Lei & Liu, Fengnian & Wei, Haiqiao, 2021. "Operation strategy optimization of lean combustion using turbulent jet ignition at different engine loads," Applied Energy, Elsevier, vol. 302(C).
    • Handle: RePEc:eee:appene:v:302:y:2021:i:c:s0306261921009624
    DOI: 10.1016/j.apenergy.2021.117586
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    References listed on IDEAS

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    1. Zhou, Lei & Hua, Jianxiong & Liu, Feng & Liu, Fengnian & Feng, Dengquan & Wei, Haiqiao, 2018. "Effect of internal exhaust gas recirculation on the combustion characteristics of gasoline compression ignition engine under low to idle conditions," Energy, Elsevier, vol. 164(C), pages 306-315.
    2. Jung, Dongwon & Sasaki, Kosaku & Iida, Norimasa, 2017. "Effects of increased spark discharge energy and enhanced in-cylinder turbulence level on lean limits and cycle-to-cycle variations of combustion for SI engine operation," Applied Energy, Elsevier, vol. 205(C), pages 1467-1477.
    3. Jung, Dongwon & Iida, Norimasa, 2018. "An investigation of multiple spark discharge using multi-coil ignition system for improving thermal efficiency of lean SI engine operation," Applied Energy, Elsevier, vol. 212(C), pages 322-332.
    4. Gentz, Gerald & Gholamisheeri, Masumeh & Toulson, Elisa, 2017. "A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization," Applied Energy, Elsevier, vol. 189(C), pages 385-394.
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    Cited by:

    1. Wang, Bin & Xie, Fangxi & Hong, Wei & Du, Jiakun & Chen, Hong & Li, Xiaoping, 2023. "Extending ultra-lean burn performance of high compression ratio pre-chamber jet ignition engines based on injection strategy and optimized structure," Energy, Elsevier, vol. 282(C).
    2. Zeng, Yonghao & Fan, Baowei & Pan, Jianfeng & He, Ren & Fang, Jia & Salami, Hammed Adeniyi & Wu, Xin, 2022. "Research on the ignition strategy of a methanol/gasoline blends rotary engine using turbulent jet ignition mode," Energy, Elsevier, vol. 261(PA).

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