日本航空宇宙学会論文集
Online ISSN : 2432-3691
Print ISSN : 1344-6460
ISSN-L : 1344-6460
ウェーブレット自己相関法を用いた拘束噴流の流れ構造の解析
田畑 陸英李 輝野崎 勉
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1999 年 47 巻 546 号 p. 285-290

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To investigate the unsteady structure of secondary flow of a turbulent bounded jet in both frequency and physical spaces, the wavelet auto-correlation analysis was used to analyze the fluctuating velocities at various positions in abounded jet. The wavelet auto-correlation analysis provides the auto-correlation characteristics of signals in terms of period and time delay. From the wavelet auto-correlation analysis, the branching structures in WR(a, τ) reveal that a periodic large eddy motion contains the periodic small eddy motions. In the shear layer near the wall at X/b0=8.0, Y/b0 =1.0 and Z/b0=1.9, the wavelet auto-correlation analysis may determine the period and the location of the large-scale structure and the secondary flows.

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© The Japan Society for Aeronautical and Space Sciences
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