Wavelet Auto-Correlation Analysis Applied to Flow Structure in a Bounded Jet

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...

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Published inJOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Vol. 47; no. 546; pp. 285 - 290
Main Authors TABATA, Takahide, Li, Hui, NOZAKI, Tsutomu
Format Journal Article
LanguageEnglish
Japanese
Published THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 01.01.1999
Subjects
Bounded Jet
Eddy
Turbulence
Wavelet Auto-Correlation
Wavelet Transform
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Summary: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.
ISSN:1344-6460
2432-3691
DOI:10.2322/jjsass.47.285