Abstract
To investigate the unsteady structure of secondary flow of a turbulent bounded jet in both Fourier and physical spaces, the wavelet auto-correlation analysis was used to analyze the fluctuating velocities at various positions in a bounded 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, y/b0=1 and z/b0=1.87, 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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