底部相对间隙在0 8～ 2 0之间时，扰流片高度小于边界层厚度时的壁面平均压力比扰流片高度大于边界层厚度时小30 %左右。

When the relative gap height (the ratio of flap height to gap width) is in the range of 0 8-2 0, the mean pressure will reduced 30% if the flap height is smaller than the thickness of boundary layer.

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