AM06-23-003 Local-Flame Propagation Characteristics of Premixed Turbulent Flames

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  • AM06-23-003 予混合乱流火炎の局所火炎伝ぱ特性に関する実験的検討(燃焼・反応流(1),一般講演)

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This study carries out to investigate directly the local flame propagation properties of hydrogen, methane and propane premixed turbulent flames in the weak turbulence region. A laser tomography technique is used to obtain the temporal local flame configuration and movement in a constant-volume vessel, and quantitative analyses are performed. The local flame front curvature and the local flame displacement velocity S_F are quantitatively obtained as the key parameters of the turbulent combustion. The values of S_F are found to be distributed over a wide range and to be dependent on the local curvature of the turbulent flame. In addition, the value of S_F for the methane and hydrogen mixtures have a tendency to become larger as decreasing its equivalence ratio, whereas those for the propane mixture become smaller. We discuss also the influence of preferential diffusion and Markstein number on the local flame displacement velocity.

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