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Comparison of open chamber and pre-chamber ignition of methane/air mixtures in a large bore constant volume chamber: Effect of excess air ratio and pre-mixed pressure

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  • Ju, Dehao
  • Huang, Zhong
  • Li, Xiang
  • Zhang, Tingting
  • Cai, Weiwei

Abstract

Natural gas is an alluring choice to substitute the widely used diesel for environmental and economic reasons as it generates less particulate matter and carbon dioxide emissions. However, natural gas is comparatively difficult to be ignited and its flame penetrates slowly in a large bore combustion chamber especially for the lean condition. In order to analyze how the pre-chamber turbulent jet ignition promotes combustion in a large volume chamber, a comparative study with the traditional open chamber ignition mode was conducted to analyze the effect of excess air ratios and pre-mixed pressures on the combustion characteristics of methane/air mixtures. In rich fuel combustion, the advantage of pre-chamber is not obvious, and the flame propagation rate can only be increased by 2.8 times in maximum. In the case of lean combustion and stoichiometric combustion, the flame propagation speeds can be increased by 5–6 times, especially in lean combustion by pre-chamber. In general, the pre-chamber turbulent jet ignition technique can increase the flame propagation rate of methane/air, and improve combustion and thermal efficiency of natural gas large-bore engines under lean combustion conditions. With comparison to the open chamber ignition mode, the reduction percentage of ignition time by pre-chamber turbulent jet ignition decreases with the rise of initial pressure. However, the asymmetric placement of the spark plug inside the pre-chamber, results in the inhomogeneous spreading of flame jets in the constant volume chamber, which ought to be considered in the design of marine engine.

Suggested Citation

  • Ju, Dehao & Huang, Zhong & Li, Xiang & Zhang, Tingting & Cai, Weiwei, 2020. "Comparison of open chamber and pre-chamber ignition of methane/air mixtures in a large bore constant volume chamber: Effect of excess air ratio and pre-mixed pressure," Applied Energy, Elsevier, vol. 260(C).
    • Handle: RePEc:eee:appene:v:260:y:2020:i:c:s0306261919320069
    DOI: 10.1016/j.apenergy.2019.114319
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    References listed on IDEAS

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    1. Biswas, Sayan & Qiao, Li, 2018. "Ignition of ultra-lean premixed hydrogen/air by an impinging hot jet," Applied Energy, Elsevier, vol. 228(C), pages 954-964.
    2. Benajes, J. & Novella, R. & Gomez-Soriano, J. & Martinez-Hernandiz, P.J. & Libert, C. & Dabiri, M., 2019. "Evaluation of the passive pre-chamber ignition concept for future high compression ratio turbocharged spark-ignition engines," Applied Energy, Elsevier, vol. 248(C), pages 576-588.
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    Cited by:

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    2. Zhu, Sipeng & Akehurst, Sam & Lewis, Andrew & Yuan, Hao, 2022. "A review of the pre-chamber ignition system applied on future low-carbon spark ignition engines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 154(C).
    3. 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).
    4. Lina Xu & Gang Li & Mingfa Yao & Zunqing Zheng & Hu Wang, 2022. "Numerical Investigation on the Jet Characteristics and Combustion Process of an Active Prechamber Combustion System Fueled with Natural Gas," Energies, MDPI, vol. 15(15), pages 1-16, July.
    5. Hammam Aljabri & Mickael Silva & Moez Ben Houidi & Xinlei Liu & Moaz Allehaibi & Fahad Almatrafi & Abdullah S. AlRamadan & Balaji Mohan & Emre Cenker & Hong G. Im, 2022. "Comparative Study of Spark-Ignited and Pre-Chamber Hydrogen-Fueled Engine: A Computational Approach," Energies, MDPI, vol. 15(23), pages 1-21, November.

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