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Explosion behavior of non-uniform methane/air mixture in an obstructed duct with different blockage ratios

Author

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  • Zheng, Kai
  • Wu, Qifen
  • Chen, Chuandong
  • Xing, Zhixiang
  • Hao, Yongmei
  • Yu, Minggao

Abstract

An experimental investigation on explosion behavior of non-uniform methane/air explosion in obstructed duct with different blockage ratios is conducted. The methane/air mixture that the methane concentration decreases from top to bottom and from ignition end to opposite end of duct is tested. The results show that the vertical concentration gradient of methane upstream along the obstacle increases with blockage ratio. After ignition, the flame speed and overpressure increase exponentially when the flame propagates with a finger-liked shape. In the poorly mixed methane/air, the flame speed and overpressure reduce with the appearance of pronounced triple flame. The flame in duct without obstacle propagates with triple shape until it approaches the vent. In the obstructed duct, the flame speed increases again after the flame passes the obstacle and then the triple flame disappears as the flame becomes turbulent. In the more evenly mixed methane/air, the flame speed decreases with the disappearance of finger shaped flame. The flame speed decreases continuously in duct without obstacle but increases again when the flame passes the obstacle in obstructed duct, in which an incomplete mushroom-shape flame forms downstream the obstacle. Generally, both the flame speed and overpressure are larger in methane/air that mixes more fully.

Suggested Citation

  • Zheng, Kai & Wu, Qifen & Chen, Chuandong & Xing, Zhixiang & Hao, Yongmei & Yu, Minggao, 2022. "Explosion behavior of non-uniform methane/air mixture in an obstructed duct with different blockage ratios," Energy, Elsevier, vol. 255(C).
    • Handle: RePEc:eee:energy:v:255:y:2022:i:c:s0360544222015067
    DOI: 10.1016/j.energy.2022.124603
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    Citations

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    Cited by:

    1. Wu, Qifen & Han, Shixin & Li, Shanshan & Yu, Minggao & Zheng, Kai & Li, Haitao & Pei, Bei & Wen, Xiaoping, 2023. "Explosive characteristics of non-uniform methane-air mixtures in half-open vertical channels with ignition at the open end," Energy, Elsevier, vol. 284(C).
    2. Bingang Guo & Jianfeng Gao & Bin Hao & Bingjian Ai & Bingyuan Hong & Xinsheng Jiang, 2022. "Experimental and Numerical Study on the Explosion Dynamics of the Non-Uniform Liquefied Petroleum Gas and Air Mixture in a Channel with Mixed Obstacles," Energies, MDPI, vol. 15(21), pages 1-16, October.
    3. Wu, Qifen & Han, Shixin & Yu, Minggao & Zheng, Kai & Li, Haitao & Feng, Shan, 2024. "Effect of the opening scale of the obstacle plate on the flame behavior of non-uniform and uniform combustible gases," Energy, Elsevier, vol. 296(C).
    4. Cao, Jiaojiao & Wu, Jiansong & Zhao, Yimeng & Cai, Jitao & Bai, Yiping & Pang, Lei, 2023. "Suppression effects of energy-absorbing materials on natural gas explosion in utility tunnels," Energy, Elsevier, vol. 281(C).
    5. Liu, Guilong & Wang, Jian & Zheng, Ligang & Pan, Rongkun & Lu, Chang & Wang, Yan & Zhao, Yongxian & Li, Yanjie, 2023. "Effect of hydrogen addition on explosion characteristics of premixed methane/air mixture under different equivalence ratio distributions," Energy, Elsevier, vol. 276(C).
    6. Jianfeng Gao & Bingjian Ai & Bin Hao & Bingang Guo & Bingyuan Hong & Xinsheng Jiang, 2022. "Effect of Obstacles Gradient Arrangement on Non-Uniformly Distributed LPG–Air Premixed Gas Deflagration," Energies, MDPI, vol. 15(19), pages 1-15, September.

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