平板扰流片高度对壁面压力分布的影响

The effect of flap height on wall pressure distribution

在风洞中研究了扰流片高度和底部间隙对平板扰流片引起的底板壁面压力分布的影响 .用电子扫描阀测量的压力分布结果表明 ,底部没有间隙时 ,扰流片高度的增加不影响扰流片前后分离点、再附点以及主涡相对位置的变化 ;而下游回流区二次涡的相对高度随着扰流片高度的增加而增加 ,导致该区域无量纲压力系数绝对值减小 .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 .底部间隙对各种扰流片引起的壁面压力分布的影响趋势完全相似 .

The effects of flap height and the gap between flap and wall on pressure distribution are investigated experimentally in wind tunnel. The result shows that the height of flap does not influence the relative location of separation point, reattachment and main vortexes in case no gap exists but the relative height of the secondary vortex increases with the height of the flap resulting in the decrease of non dimensional pressure coefficient in the vicinity rear to the flap. 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. The influences of gap with different height on pressure distribution are in the same manner.