Abstract
An experimental study has been made of the large-scale structures in a two-dimensional, high Reynolds number, turbulent free shear layer bounded by Mach 5 and 3 airstreams. The convective Mach number was about 0.28. Mean pitot pressure surveys were made to determine the shear layer growth rate, the two-dimensionality, and the external flowfield. Two-point fluctuating pitot pressure measurements were made to investigate the large-scale structure at several stations from 600 to 2450 initial momentum thicknesses θ 0 downstream of the shear layer origin. Power spectra show increasing organization with distance downstream, and at 2450 θ 0 , the large-scale structures are responsible for a strong concentration of energy between 16 and 25 kHz
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