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《Journal of Engineering Thermophysics》 2001-05
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GONG Wu-Qi HUANG Shu-Juan XU Zhong (Xi'an Jiaotong University, Xi'an 710049, China)  
At three Reynold numbers the instantaneous pulse velocity in a smooth turbulent boundary layer is measured by the hot-wire anemometry. The discrete orthogonal wavelet theory is applied to analyze the velocity signal and get its time-scale components. Then it is extracted the component which has the maximum turbulent dynamic energy, and at the same time the scale and frequency of the component is determined. It is concluded that the profile curves (vs y+) of the non-dimensional parameter of the wavelet scale have the property of the Reynold similarity, and the frequency is nearly a constant along y+. Furthermore, it is also concluded that the turbulent dynamic energy mainly concentrates on several limited components.
【CateGory Index】: O357.5
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