The mechanism of mixing enhancement and suppression in a circular jet under excitation conditions
- 1 July 1985
- journal article
- conference paper
- Published by AIP Publishing in Physics of Fluids
- Vol. 28 (7) , 2062-2074
- https://doi.org/10.1063/1.865387
Abstract
The present work is a numerical study of the shear layer’s growth in a turbulent round jet under forced axisymmetric periodic disturbances. The forced oscillation is found to either enhance or reduce the momentum thickness along the jet depending on the forcing Strouhal number St, where St is defined as fd/Ue. Here, f is the frequency in Hertz, d is the nozzle exit diameter, and Ue is the jet exit velocity. At low Strouhal numbers (Stθ≊0.015, several subharmonics are generated and the forcing is found to result in a reduction in the momentum thickness along the jet.Keywords
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