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Experimental study on flame structure transitions of premixed propane/air in micro-scale planar combustors

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  • Tang, Aikun
  • Cai, Tao
  • Deng, Jiang
  • Zhao, Dan
  • Huang, Qiuhan
  • Zhou, Chen

Abstract

Flame structure transitions of propane/air premixed combustion in a micro-planar quartz glass combustor in the present study have been extensively investigated using a high-speed digital camera. Six different flame propagation modes, namely, flame repetitive extinction and ignition (FREI), cellular flame, planar flame, U-shaped, inclined and spinning flames, are observed with varying inlet velocity and equivalence ratio. The FREI and cellular flames as well as spinning flames, for the first time, are experimentally discovered in micro-planar straight channel combustor. Based on the upper and lower limit of each flame mode, the flame structure regime diagram is constructed. Experimental observations indicate that different flame propagation modes may coexist during transition due to the hysteresis phenomenon. The effects of equivalence ratio, channel length and channel height on flame characteristics are analyzed. Results show that channel length has minimal effect on flame structure, whereas channel height significantly affects flame propagation behavior. It is also found that the flame dynamics is much more complicated with wider channel height. Furthermore, it is worthy of pointing out that the inclined flames disappears as the channel height is decreased from 3 to 2.5 and 2.0 mm, and the ultimate flame is U-shaped at large inlet velocity.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:179:y:2019:i:c:p:558-570
    DOI: 10.1016/j.energy.2019.05.005
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    7. Sun, Bowen & Kang, Xin & Wang, Yu, 2020. "Numerical investigations on the methane-oxygen diffusion flame-street phenomena in a microchannel: Effects of wall temperatures, inflow rates and global equivalence ratios on flame behaviors and combu," Energy, Elsevier, vol. 207(C).
    8. 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).
    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. Peng, Qingguo & Yang, Wenming & E, Jiaqiang & Li, Shaobo & Li, Zhenwei & Xu, Hongpeng & Fu, Guang, 2021. "Effects of propane addition and burner scale on the combustion characteristics and working performance," Applied Energy, Elsevier, vol. 285(C).

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