This paper examines the effects of using different grids, placed at the nozzle exit plane, on the subsequent development of a subsonic round air jet. Modifications to the initial development of the jet are achieved in a passive manner by placing different grids at the nozzle exit plane. Time-averaged statistics of the velocity, including spectra, are combined with a numerical linear instability investigation. The grids suppress the initial shear layer instability whereas they damp the jet column instability. As a result, the streamwise decay and radial spreading of the perturbed jets are reduced. The instability analysis yields realistic values for the fastest growing instability frequency but incorrect growth rates.
Experiments in Fluids – Springer Journals
Published: Mar 17, 2004
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