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Ultra-rich fuel dynamics of a holder-stabilized premixed flame in a preheated mesoscale combustor

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  • Wan, Jianlong
  • Zhao, Haibo

Abstract

The present work experimentally studies the laminar premixed flame dynamics at fuel ultra-rich condition under the synergistic effect of heat and flow recirculation, which take place in many practical combustors, such as aero engines. The normal, anomalous, and low speed blow-off phenomena are observed. Furthermore, the anomalous standoff distance between the flame root and the holder is found for the first time at fuel rich condition. Interestingly, with an increase in the equivalence ratio, the oscillating flame appears before blow-off at Reynolds number Re ≥ 60. The stability limit first increases and then decreases with a decrease in Re, which is also reported for the first time. If the equivalence ratio is increased further, the oscillating flame at Re ≥ 60 blows off with a small timescale, while the stable flame at Re < 60 gradually acquires a flat behavior, and then shifts downstream at a very slow speed.

Suggested Citation

  • Wan, Jianlong & Zhao, Haibo, 2021. "Ultra-rich fuel dynamics of a holder-stabilized premixed flame in a preheated mesoscale combustor," Energy, Elsevier, vol. 214(C).
    • Handle: RePEc:eee:energy:v:214:y:2021:i:c:s0360544220320673
    DOI: 10.1016/j.energy.2020.118960
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    References listed on IDEAS

    as
    1. Wan, Jianlong & Zhao, Haibo, 2017. "Dynamics of premixed CH4/air flames in a micro combustor with a plate flame holder and preheating channels," Energy, Elsevier, vol. 139(C), pages 366-379.
    2. Wan, Jianlong & Zhao, Haibo, 2020. "Effect of thermal condition of solid wall on the stabilization of a preheated and holder-stabilized laminar premixed flame," Energy, Elsevier, vol. 200(C).
    3. Wan, Jianlong & Zhao, Haibo, 2020. "Effect of conjugate heat exchange of flame holder on laminar premixed flame stabilization in a meso-scale diverging combustor," Energy, Elsevier, vol. 198(C).
    4. Wan, Jianlong & Xu, Zuwei & Zhao, Haibo, 2018. "Methane/air premixed flame topology structure in a mesoscale combustor with a plate flame holder and preheating channels," Energy, Elsevier, vol. 165(PB), pages 802-811.
    5. Wan, Jianlong & Zhao, Haibo, 2018. "Thermal performance of solid walls in a mesoscale combustor with a plate flame holder and preheating channels," Energy, Elsevier, vol. 157(C), pages 448-459.
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    Cited by:

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