中文摘要：

用IFA300热线风速仪和双丝热线探针，在风洞中精细测量施加不同频率周期扰动前后的平板湍流边界层不同流向和法向位置的流向和法向速度分量的时间序列信号，采样频率高于Kolmogorov耗散时间尺度对应的频率。采用周期相位平均技术，从湍流边界层瞬时流向和法向速度分量信号中提取周期扰动速度信号的周期相位平均波形。对不同频率的扰动波在湍流边界层内沿流向和法向的衰减进行实验研究，测量不同扰动频率的流向、法向速度分量的扰动振幅在湍流边界层内沿流向和法向的分布．应用流动稳定性理论．计算扰动信号幅值的增长率在湍流边界层内沿流向和法向的分布，并与已有的理论、计算和实验结果进行对比分析。

英文摘要：

Time sequence signals of instantaneous longitudinal and normal velocity components at different longitudinal and normal positions in a turbulent boundary layer have been finely measured simultaneously by IFA300 constant temperature anemometer and double-sensor hot-wire probe with sampling resolution higher than the frequency that corresponds to the smallest time scale of Kolmogorov dissipation scale before/after introducing artificial periodic blow and suction perturbation. The period- phase-average technique is applied to extract the periodic waveforms of artificial perturbation from instantaneous time sequence signals of longitudinal and normal turbulence background. Experimental investigation is carried out on the attenuation characteristics of periodic perturbation wave with different frequency along longitudinal direction and normal direction in a turbulent boundary layer. The amplitude distributions of longitudinal and normal disturbing velocity component for different perturbation frequencies are measured at different downstream and normal positions in turbulent boundary layer. The amplitude growth rate of artificial periodic perturbation wave is calculated according to flow instability theory.