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Effect of conjugate heat exchange of flame holder on laminar premixed flame stabilization in a meso-scale diverging combustor

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  • Wan, Jianlong
  • Zhao, Haibo

Abstract

The present work investigates the effect of heat exchange of flame holder on the premixed flame stabilization in a diverging channel through numerical simulation. When the heat exchange of flame holder exists, the flame can remain stable and presents a “V” shape. A majority of the heat flux that enters the flame holder is used to preheat the incoming fresh mixture, which can induce and enhance the initiation of reactions. Moreover, three different zones are found and defined, including the free reaction zone, the quenching zone, and the enhanced reaction zone. However, when the heat exchange of flame holder is absent, the flame pulsates up and down instead of remaining stable, and shows a cone “Λ” shape. Subsequently, the pulsating mechanisms of flame are quantitatively analyzed in terms of local flow velocity, the angle between flow direction and flame front, and the stretch rate. The pulsation is a dynamic process where the flame speed self-adjusts to match the normal component of flow velocity. In summary, the present study indicates that the heat exchange of flame holder can significantly suppress the flame instability and improve the flame anchoring performance.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:198:y:2020:i:c:s0360544220304011
    DOI: 10.1016/j.energy.2020.117294
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    References listed on IDEAS

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    1. Wan, Jianlong & Fan, Aiwu & Yao, Hong & Liu, Wei, 2016. "Experimental investigation and numerical analysis on the blow-off limits of premixed CH4/air flames in a mesoscale bluff-body combustor," Energy, Elsevier, vol. 113(C), pages 193-203.
    2. Baigmohammadi, Mohammadreza & Sarrafan Sadeghi, Soroush & Tabejamaat, Sadegh & Zarvandi, Jalal, 2013. "Numerical study of the effects of wire insertion on CH4(methane)/AIR pre-mixed flame in a micro combustor," Energy, Elsevier, vol. 54(C), pages 271-284.
    3. Alipoor, Alireza & Mazaheri, Kiumars, 2016. "Combustion characteristics and flame bifurcation in repetitive extinction-ignition dynamics for premixed hydrogen-air combustion in a heated micro channel," Energy, Elsevier, vol. 109(C), pages 650-663.
    4. Veeraragavan, Ananthanarayanan, 2015. "On flame propagation in narrow channels with enhanced wall thermal conduction," Energy, Elsevier, vol. 93(P1), pages 631-640.
    5. Bani, Stephen & Pan, Jianfeng & Tang, Aikun & Lu, Qingbo & Zhang, Yi, 2018. "Numerical investigation of key parameters of the porous media combustion based Micro-Thermophotovoltaic system," Energy, Elsevier, vol. 157(C), pages 969-978.
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    Cited by:

    1. 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).
    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. Zhang, Yueliang & Li, Jiangheng & Xie, Jin, 2022. "Effects of lateral cooling hole configuration on a swirl-stabilized combustor," Energy, Elsevier, vol. 259(C).

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