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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Wavelet Analysis for the Plane Turbulent Jet (Analysis of Large Eddy Structure)
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Wavelet Analysis for the Plane Turbulent Jet (Analysis of Large Eddy Structure)

机译：平面湍流射流的小波分析（大型涡结构分析）

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摘要

In this study, wavelet analysis is applied to velocity signals of a plane turbulent jet, in order to investigate the eddy structure in the dimensions of time and scale. First, a review of the definitions and the basic properties of wavelet analysis are introduced, and a revised form of the Mexican hat and the wavelet power spectrum are proposed. To illustrate some typical behaviors of the wavelet coefficient phase, a numerically generated signal is analyzed. Then from the velocity signals of a jet on the centerline and in the mixing layer, the structural features of the eddy are analyzed in terms of instantaneous frequency and onset time/position. The results reveal that eddies of very different scale and the breakdown of a large eddy are displayed in the wavelet coefficient phase, as well as the successive branchings of a large eddy structure. Furthermore, it is found that the scale of the eddy and intermittency in the mixing layer can be obtained by wavelet analysis. The wavelet power spectra agree fairly well with the Fourier power spectra and just correspond to the actual kinetic energy per unit time at each wave number.
机译：在这项研究中，小波分析被应用于平面湍流射流的速度信号，以研究时间和尺度的涡结构。首先，介绍了小波分析的定义和基本性质，并提出了墨西哥帽和小波功率谱的修正形式。为了说明小波系数相位的一些典型行为，分析了一个数字生成的信号。然后根据中心线上和混合层中射流的速度信号，根据瞬时频率和起始时间/位置分析涡流的结构特征。结果表明，在小波系数相中显示了尺度不同的涡旋和大涡旋的分解，以及大涡旋结构的连续分支。此外，发现可以通过小波分析获得混合层中的涡旋的大小和间歇性。小波功率谱与傅立叶功率谱非常吻合，并且仅对应于每个波数下每单位时间的实际动能。

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