高強度乱流予混合火炎の局所的な反応帯における輸送機構

概要

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The present study has been performed to examine the transport mechanism at the local reaction zone of turbulent premixed flames in a regime in which the Kolmogorov scale is smaller than laminar premixed flame thickness. Even in this regime, the wrinkle scale of the flame was found to depend on the characteristics of the mixture. The wrinkle scale of a propane-air turbulent premixed flame is smaller than that of a methane-air flame. Comparing the wrinkle scales under the condition of the same laminar burning velocity, the wrinkle scale of a lean methane-air and rich propane-air turbulent premixed flame was found to be smaller than the average value. These results show the effect of preferential diffusion between fuel and oxygen molecules on the wrinkle scale. Therefore, it is concluded that even in the regime in which the Kolmogorov scale is smaller than the laminar premixed flame thickness, the molecular transport mechanism still plays an important role at the local reaction zone. This conclusion contradicts the results of a previous discussion on the structure of turbulent premixed flames based on the turbulence characteristics in non-reacting flows. We should abandon such discussion.
社団法人日本機械学会の論文
1996-06-25