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Experimental study on the combustion and flame propagation characteristics of CH4/O2/N2 premixed turbulent jets

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  • Li, Gang
  • Zhen, Haisheng
  • Wang, Hu
  • Liu, Haifeng
  • Zheng, Zunqing
  • Yao, Mingfa

Abstract

The combustion and flame propagation characteristics of CH4/O2/N2 premixed turbulent jets are investigated experimentally in a constant volume chamber (CVC) under different initial temperature (Tini, 300/400/500/600K) and oxygen fractions (γ, 0.4/0.6/0.8/1.0) conditions using High-speed camera and schlieren system. Four types of jet tip velocity were found: primary vortex motion at the jet top (M-type 1), secondary vortex motion (M-type 2), weaker positive and negative feedback between the flame and the flow field (M-type 3), and stronger positive and negative feedback (N-type 4). With the decrease of γ, the jet acceleration and deceleration mechanism is changed from the top vortex motion mechanism in M-type 1 and M-type 2 to the positive and negative feedback mechanism in M-type 3 and N-type 4. The interaction between the pulsating flow field and the heat release from the pre-chamber transitions to the flow field momentum dissipation. For M-type 1 and M-type 2, there is no significant difference in overpressure dynamics. The N-type 4 exhibits lower peak pressure and pressure rise rates. Moreover, the flame mode was predicted under higher Pini (10 bar ≤ Pini) and lower γ (γ ≤ 0.4) based on empirical equations established by the self-similar analytical model.

Suggested Citation

  • Li, Gang & Zhen, Haisheng & Wang, Hu & Liu, Haifeng & Zheng, Zunqing & Yao, Mingfa, 2024. "Experimental study on the combustion and flame propagation characteristics of CH4/O2/N2 premixed turbulent jets," Energy, Elsevier, vol. 302(C).
    • Handle: RePEc:eee:energy:v:302:y:2024:i:c:s0360544224015767
    DOI: 10.1016/j.energy.2024.131803
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    References listed on IDEAS

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    1. 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).
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