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Effect of hydrogen addition on explosion characteristics of premixed methane/air mixture under different equivalence ratio distributions

Author

Listed:
  • Liu, Guilong
  • Wang, Jian
  • Zheng, Ligang
  • Pan, Rongkun
  • Lu, Chang
  • Wang, Yan
  • Zhao, Yongxian
  • Li, Yanjie

Abstract

To estimate the hazard of explosion during hydrogen/methane gas transportation, the experiments were conducted in a small-scale duct. It studied the effect of hydrogen fraction and equivalent ratio distribution on flame propagation characteristics and pressure characteristics. It showed that the flame propagation process can be divided into steady-state and broken-state. During the steady-state, the addition of hydrogen will accelerate the evolution of the flame structure, leading to a reduction in the observed flame structure patterns. And the pressure transferred from bimodal to unimodal distribution. When entering the broken-state, a secondary explosion occurred. Then the flame propagation velocity started to increase dramatically and emitted a dazzling white light. This secondary explosion is more dangerous and significantly influenced by the equivalence ratio of duct A (φA) where the ignition source is located. Therefore, it was calculated the parameters of laminar combustion of φA, and the variation of key radicals was analyzed. Finally, the fitted equations of the maximum flame propagation speed (Vmax) and the maximum explosion pressure (Pmax) with laminar burning velocity (SL) were obtained. It was found that the growth rate of Vmax gradually decreased with increasing SL, while the growth rate of Pmax gradually increased.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:276:y:2023:i:c:s0360544223010010
    DOI: 10.1016/j.energy.2023.127607
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    References listed on IDEAS

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