周期性扰动对平板湍流边界层统计性质的影响

用IFA300热线风速仪和X形二分量热线探针精细测量了平板湍流边界层在施加不同频率的周期性吹吸扰动前后不同法向位置的瞬时流向、法向速度分量的时间序列信号.在平板湍流边界层的固壁表面沿展向切割一条5 mm宽的窄缝, 在平板底部用扬声器从壁面向平板湍流边界层内施加不同频率的周期性吹吸扰动, 研究不同频率的周期性扰动在平板湍流边界层内发展演化的规律及对平板湍流边界层统计性质的影响. 

Influence of periodic disturbance on statistic character of turbulent boundary layer

Simultaneous time sequence of lorgitudinal and normal velocity components with and with out periodic blow-suction disturbance had been measured by IFA300 constant temperature anemometer and X-type hot-wire probe at different normal positions along the turbulent boundary layer.A latitudinal thin slot in 5 mm width was incised on a smooth flat plate.The periodic blow-suction force with different frequency was applied to turbulent boundary layer from a speaker woofer under the plate.The quantitative influence of local periodic blow-suction disturbance with different frequency on statistic character of turbulent boundary layer had been investigated.