周期性扰动对湍流边界层层次结构的影响

The Effect of Periodic Disturbance to the Hierarchical Structure in Turbulent Boundary Layer

在开口式循环水槽底部湍流边界层外区中引入周期性扰动,对湍流场的速度脉动时间序列信号进行了统计分析,研究了湍流边界层中周期性人工扰动对湍流结构的影响,结果表明高频扰动的湍流中SheLeveque(简称SL)湍流层次相似律成立。

Artificial periodic disturbances are introduced to the outer field of turbulent boundary layer in an closed-circuit open water channel. Statistical method is employed for analyzing the velocity-fluctuation-timeseries. The effect of the disturbance to turbulent structure in boundary layer is studied. The result indicates the She-Leveque hierarchical similarity exists among high frequency turbulence.