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Dynamics of premixed CH4/air flames in a micro combustor with a plate flame holder and preheating channels

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  • Wan, Jianlong
  • Zhao, Haibo

Abstract

It is challenging to achieve a wide flammable range in micro combustors due to the increased heat loss. In the present work, the flammable range based on equivalence ratio for a novel micro combustor is investigated, and some interesting dynamic flame behaviors are observed, which include the flame blow-off, pulsating flame and the flame with repetitive flashback and pulsating (FRFP). Our analysis indicates that the above flame behaviors mainly depend on the competition of the burning velocity and flow speed. For the lean fuel, a higher equivalence ratio leads to a faster burning velocity and a higher preheating temperature. A higher preheating temperature further elevates the burning velocity as well as the flow speed of incoming gas mixture. The faster burning velocity makes the flame shift upstream, but the bigger flow speed pushes the flame downstream. In such a way, the increase of equivalence ratio gives rise to the increase of burning velocity and flow speed, and the burning velocity increases faster than the flow speed. In addition, the flame dynamics distributions are almost symmetrical with respect to the stoichiometric ratio, i.e., the flame behaviors under lean and rich fuel are the same basically.

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  • 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.
    • Handle: RePEc:eee:energy:v:139:y:2017:i:c:p:366-379
    DOI: 10.1016/j.energy.2017.08.002
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    References listed on IDEAS

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    1. Baigmohammadi, Mohammadreza & Tabejamaat, Sadegh & Faghani-Lamraski, Morteza, 2017. "Experimental study on the effects of mixture flow rate, equivalence ratio, oxygen enhancement, and geometrical parameters on propane-air premixed flame dynamics in non-adiabatic meso-scale reactors," Energy, Elsevier, vol. 121(C), pages 657-675.
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    Cited by:

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    2. 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).
    3. Aravind, B. & Khandelwal, Bhupendra & Kumar, Sudarshan, 2018. "Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator," Applied Energy, Elsevier, vol. 228(C), pages 1173-1181.
    4. Tang, Aikun & Cai, Tao & Deng, Jiang & Zhao, Dan & Huang, Qiuhan & Zhou, Chen, 2019. "Experimental study on flame structure transitions of premixed propane/air in micro-scale planar combustors," Energy, Elsevier, vol. 179(C), pages 558-570.
    5. Yang, Xiao & Yang, Wenming & Dong, Shikui & Tan, Heping, 2020. "Flame stability analysis of premixed hydrogen/air mixtures in a swirl micro-combustor," Energy, Elsevier, vol. 209(C).
    6. Li, Jun & Xiao, Hongcheng & Li, Qingqing & Shi, Junrui, 2021. "Heat recirculation and heat losses in porous micro-combustors: Effects of wall and porous media properties and combustor dimensions," Energy, Elsevier, vol. 220(C).
    7. Aravind, B. & Hiranandani, Karan & Kumar, Sudarshan, 2020. "Development of an ultra-high capacity hydrocarbon fuel based micro thermoelectric power generator," Energy, Elsevier, vol. 206(C).
    8. Aravind, B. & Khandelwal, Bhupendra & Ramakrishna, P.A. & Kumar, Sudarshan, 2020. "Towards the development of a high power density, high efficiency, micro power generator," Applied Energy, Elsevier, vol. 261(C).
    9. Cai, Tao & Tang, Aikun & Zhao, Dan & Zhou, Chen & Huang, Qiuhan, 2020. "Flame dynamics and stability of premixed methane/air in micro-planar quartz combustors," Energy, Elsevier, vol. 193(C).
    10. Yilmaz, Harun & Yilmaz, Ilker, 2019. "Combustion and emission characteristics of premixed CNG/H2/CO/CO2 blending synthetic gas flames in a combustor with variable geometric swirl number," Energy, Elsevier, vol. 172(C), pages 117-133.

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