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Numerical study on the asymmetrical jets formation from active pre-chamber under super-lean combustion conditions

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  • Zhao, Deyang
  • An, Yanzhao
  • Pei, Yiqiang
  • Shi, Hao
  • Wang, Kun

Abstract

This paper aims to investigate the mechanism of the asymmetric jets of the TJI system. We analyzed the effects of fuel injection and air flows in pre-chamber and main chamber, initial flame kernel, and evolution of turbulent hot jets. The evaluation indexes of asymmetric jet were proposed. The results show when adding fuel injection into the homogeneous PC with off-central spark plug, the average relative velocity range and average degree of velocity non-uniformity increased by 50.8% and 32.8%, which increased by 75.1% and 46.7% for the real engine condition with intake airflow and fuel injection. A similar phenomenon was observed for central spark plug settings but with a much stronger impact on the asymmetry of jets velocity as proved by the increment of 138.5% and 93.2% under real engine condition. The asymmetric jets can be divided into the asymmetry of jets size and the asymmetry moment of flame jets. The former of different jets’ velocity is attributed to the tumble flow in main chamber. The latter is attributed to the irregular flame propagation caused by the off-central ignition and the uneven mixture distribution in pre-chamber. The optimization strategies to efficiency utilize the flow exchange between PC and MC were proposed.

Suggested Citation

  • Zhao, Deyang & An, Yanzhao & Pei, Yiqiang & Shi, Hao & Wang, Kun, 2023. "Numerical study on the asymmetrical jets formation from active pre-chamber under super-lean combustion conditions," Energy, Elsevier, vol. 262(PA).
    • Handle: RePEc:eee:energy:v:262:y:2023:i:pa:s0360544222023283
    DOI: 10.1016/j.energy.2022.125446
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    References listed on IDEAS

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    1. da Costa, Roberto Berlini Rodrigues & Rodrigues Filho, Fernando Antônio & Moreira, Thiago Augusto Araújo & Baêta, José Guilherme Coelho & Guzzo, Márcio Expedito & de Souza, José Leôncio Fonseca, 2020. "Exploring the lean limit operation and fuel consumption improvement of a homogeneous charge pre-chamber torch ignition system in an SI engine fueled with a gasoline-bioethanol blend," Energy, Elsevier, vol. 197(C).
    2. Zhao, Zhenfeng & Cui, Huasheng, 2022. "Numerical investigation on combustion processes of an aircraft piston engine fueled with aviation kerosene and gasoline," Energy, Elsevier, vol. 239(PD).
    3. Li, Hong-Meng & Li, Guo-Xiu & Jiang, Yan-Huan & Li, Lei & Li, Fu-Sheng, 2018. "Flame stability and propagation characteristics for combustion in air for an equimolar mixture of hydrogen and carbon monoxide in turbulent conditions," Energy, Elsevier, vol. 157(C), pages 76-86.
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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. Hu, Junnan & Pei, Yiqiang & An, Yanzhao & Zhao, Deyang & Zhang, Zhiyong & Sun, Jian & Gao, Dingwei, 2023. "Study of active pre-chamber jet flames based on the synergy of airflow with different nozzle swirl angle," Energy, Elsevier, vol. 282(C).
    3. Leonid Plotnikov, 2023. "Preparation and Analysis of Experimental Findings on the Thermal and Mechanical Characteristics of Pulsating Gas Flows in the Intake System of a Piston Engine for Modelling and Machine Learning," Mathematics, MDPI, vol. 11(8), pages 1-16, April.

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