基于子波变换的周期扰动下壁湍流涡结构多尺度分析

Multi-scale Eddy Structure Analysis for Wall Turbulence under Periodic Disturbance By Wavelet Transform Method

指出了子波变换在分析含有周期成分的湍流脉动信号时所存在的问题,并给出解决方法;采用该方法,在边界层中沿法向研究了湍流边界层外区引入的周期扰动对其下游湍流中各尺度涡结构的作用.

The energyleakage existed in the result of wavelet analysis for the periodical signal is analyzed and an improved method is presented. In this way, the effect of the periodic disturbance acting in outer field of boundary layer to the energy of various scale structures in downstream turbulence is observed.