绕扰流片分离流动的壁面压力测量

Pressure measurement on the plate induced by the flap

在风洞中用电子扫描阀进行测压实验,研究了底部间隙和锯齿高度对扰流片引起的壁面压力分布的影响。结果表明底部间隙在g/h≥1.0时对扰流片上游壁面压力分布曲线有较大影响,而对下游回流区压力分布曲线的影响主要在0≤g/h≤2.0的区域内;并且在g/h=0.2、1.0时,流动结构发生改变。另外,锯齿扰流片的当量面积与平板扰流片相等时,锯齿高度对下游底板压力分布特性的影响亦主要限于0≤x/h≤2.0的区域。

Wall pressure distribution induced by the plate flap and sawtooth flap, which are varied with the size of the gap, has been investigated with electronic pressure scanner in wind tunnel. The results show that the gap size has obvious effect on the wall pressure upstream of the plate flap when it is greater than the height of the flap; and changes the wall pressure at 0≤g/h≤2.0 downstream of the plate flap, which is the recirculation region. And the gap size g/h=0.2, 1.0 are the critical points at which the flow structure channges. The height of the sawtooth mainly changes the pressure distribution at 0≤x/h≤2.0 downstream of the flap.