Numerical simulation of influence of surface reaction on combustion characteristics in propane-air premixed flame

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  • TAKATORI Shun
    Department of Mechanical Science and Engineering, Nagoya University
  • HAYASHI Naoki
    Department of Mechanical Science and Engineering, Nagoya University
  • YAMASHITA Hiroshi
    Nagoya Industrial Science Research Institute Aichi Institute of Technology

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Other Title
  • プロパン-空気予混合火炎の燃焼特性に与える表面反応の影響に関する数値解析

Abstract

Flame-wall interaction is an important phenomenon on combustors. Especially, the influence of wall on the flame characteristics in small scale combustors becomes larger than that on normal scale ones because of their large surface-to-volume ratio. In this study, the influence of surface reaction and heat-loss on radical distributions and heat release rate of propane-air mixture is investigated using numerical simulation. A two-dimensional slit burner between two parallel plates is modeled. The distance between the plates is changed, and the profiles are obtained for both active wall, which is considered surface reaction causes radical quenching, and inert wall conditions. As a result, it is found that heat release rate for active wall condition is smaller than that for inert wall condition while the reactant consumption rate is the same for active and inert wall conditions. It is because that the radical which distribute widely near the wall like OH is quenched by surface reaction before be used in gas phase reaction. Thus, the blow off distance for active wall with high wall temperature condition is larger than that for inert wall condition. For low wall temperature condition, since the influence of surface reaction is negligibly small as compared with that of heat-loss, the distance is the same value for active and inert wall conditions.

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