壁面加热湍流相干结构的实验研究

用热线风速仪测量了风洞中壁面加热平板湍流边界层不同法向位置的流向脉动速度,用条件采样方法中的m-u-level法和VITA法研究了壁面加热对壁湍流相干结构猝发条件平均波形的影响,发现壁面另热能够提高猝发强度,缩短喷射时间,使一次猝发中出现多次喷射事件的现象明显增多,增强猝发的间歇性。

An Experimental Research on the Coherent Structure in Heated Wall Turbulence

Longitudinal fluctuating velocity was measured by hot wire anemometer at different vertical locations in the near wall region of a turbulent boundary layer to examine the effect of heating on the wall turbulence. Knowledges on the burst in the near wall region detected by conditional sampling method with m u level scheme and VITA scheme provide some understanding on the coherent structures in wall turbulence and the effects of heating on it. It is found that heating the wall can increase the intensity of coherent structure burst, and that the burst which contains more eject events becomes more frequently and the bursts are more intermittent.