介绍了子波分析的历史、基本知识以及在实验流体力学方而后总用。讨论了子波变换在客观辫识端边界层相干结构方面的应用。作者用子波变换的方法提出了确定流动界层相干结构算发时间尺度的能量最人准则，提取了相干结构对应的速度信号波形、用于波变换研究了端流力界层脉动速度信号的局部奇异性行为，发现相干结构发生处脉动速度信号的局部奇异性指数为负数。

Experimental investigations have been devoted to the study of scaling law of coarse-grained dissipation rate structure funcfion for velocity and temperature fluctuation of non-isotropic and inhomogeneous turbulent flows at moderate Reynolds number Much aUention has been paid to the case of turbulent boundary layer, which is typically the non-istropic and inhomogeneous trubulence because of the dynamicary important existence of organized coherent structure burst process in the near wall region Longitudinal velocity and temperature have been measured at different vertical positions in turbulent boundary layer over a heated and unheated flat plate in a wind tunnel using hot wire anemometer The influence of non-isotropy and inhomogeneity and heating the wall On the scaling law of the dissipation rate structure funation7 is studied because of the existence of organized coherent structure burst process in the near wall region The scaling law of coarse-grained dissipation rate structure function is found to be independent of the mean velocity shear strain and the heating wall boundary condition. The sealing law of the dissipation rale structure function is verified to be in agreement with the hierarchical structure model that has been verified valid for isotropic and homogeneous turhulence.

The time sequence of longitudinal velocity component at different vertical locations in turbulent boundary layer was finely measured in a wind tunnel. The concept of coarse-grained velocity structure functions, which describes the relative motiom of straining and compressing for multi-scale eddy structures in turbulent flows, Was put forward based on the theory of locally multi-scale average. Based on the consistency between coarse-grained velocity structure function and Hart wavelet transformation, detecting method Was presented, by which the coherent structures and their intennittency was identified by multi-scale flatness factor calculated by locally average structure function. Phase-averaged evolution course for multi-scale coherent eddy strucatres in wall turbulence were extracted by this conditional sampling to educe scheme. The dynamics course of multi-scale coherent eddy structures and their effects on statistics of turbulent flows were studied.

引入了子波变换的方法来确定检测壁湍流猝发事件的VITA法的短时间平均周期T。为了确定VITA法的短时间平均周期T，用子波变换对热膜测速仪测量得到的湍流边界层近壁区域的流向脉动速度的时间序列进行了分解，分解在时域和频域同时进行，根据每一个尺度的子波系数的模的平方在时域的积分得到壁湍流每一个尺度的脉动动能随尺度的分布。用能量最大准则确定与壁湍流猝发事件的时间尺度对应的能量最大的尺度，该尺度也就是VITA法的短时间平均周期。

用子波分析的方法，对用热膜测速仪得到的平板湍流边界层中流向脉动速度信号，在时域空间和频域空间同时进行时频双局部化分解.用子波系数研究了壁湍流脉动动能随尺度的分布，提出了确定壁湍流猝发事件时间尺度参数的能量最大准则，用子波逆变换得到了猝发事件对应的速度信号波形.