锯齿型扰流片对壁面压力分布的影响

Wall Pressure Distribution Induced by Saw-Tooth Flap

在风洞用电子扫描阀进行测压 ,研究了绕平板扰流片和锯齿扰流片分离流动的壁面压力分布 .结果表明平板扰流片和锯齿扰流片均在上游x h =- 6处剪切层开始分离 ,并再附于下游x h≈ 2 0的位置 .锯齿扰流片横向位置的变化对壁面平均压力分布几乎没有影响 ,但通过锯齿槽流向的压力脉动一般大于通过锯齿尖点流向的脉动 .从平均压力分布看 ,锯齿高度可以增加扰流片阻流效果 。

Wall pressure distribution induced by the saw-tooth flap has been investigated with electronic pressure scanner in wind tunnel. The results showed that the shear layer of the saw-tooth flap separated at x/h=(6 upstream and reattached at x/h≈20 downstream, which is the same with the plate flap; The transverse location of the flap has little influence on the mean pressure distribution, and the distribution of pressure fluctuation along the saw-tooth groove is greater than that along the saw-tooth tip; The saw-tooth can block the flow and much more effectively reduce the pressure fluctuation downstream.