Flame-Flow Interaction in Turbulent Premixed Flames (Change in Gas Velocity across the Flamelet in Turbulent Premixed Flames)

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  • 乱流予混合火炎における火炎と流れの相互作用（火炎面の前後におけるガス流速の変化）

Abstract

An attempt has been made to examine the effects of flamelet on the local flow in turbulent premixed flames in a reaction-sheet regime. Vectors of the flamelet motion and gas velocity have been measured simultaneously by use of a four-element electrostatic probe and a three-color, six-beam LDV system on the centerline of the turbulent flame brush. It has been clearly shown that change in the gas velocity across the flamelet differs whether the flamelet passes in the unburnt-to-burnt or burnt-to-unburnt direction. When the flamelet passes in the unburnt-to-burnt direction, the unburnt mixture exists above the flamelet and the burnt gas below the flamelet. The acceleration due to thermal expansion occurs perpendicularly downward to the flamelet, consequently, the gas velocity component normal to the flamelet decreases in the burnt gas. When the flamelet passes in the burnt-to-unburnt direction, the burnt gas exists below the flamelet and the unburnt mixture above the flamelet. The acceleration due to thermal expansion occurs perpendicularly upward to the flamelet, consequently, the gas velocity component normal to the flamelet decreases in the unburnt mixture.

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