定容燃焼容器による予混合乱流燃焼の実験的研究(火炎の微視的構造とフラクタル次元)

概要

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Abstract The purpose of this study is the quantitative evaluation of relation between flame structure and turbulence of gas flow under turbulent premixed combustion. To measure simply, constant volume combustion bomb which is equipped turbulence control device is used. The authors measured the gas flow by Laser Doppler Velocimeter, and calculated turbulence intensity as characteristic value of gas flow. Flame structure was measured as cross sectional image by laser sheet method. To evaluate flame structure quantitatively, periphery / periphery of ideal circle, characteristic of unevenness and fractal dimension which is calculated by box-counting method were used. These value express complexity of flame front shape. Box-counting method can evaluate flame shape which is chipped off part of the rim. As results, the authors found that, in the range of 0.14-2.14m/s of turbulence intensity, unevenness of flame front increased with turbulence of gas flow and flame growth. Although, in spite of flame size, flame grew up with constant dimension every turbulence intensity.
宮崎大学の論文