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Effect of initial conditions on the near-field development of a round jet

par Burattini, Paolo ;Antonia, Robert;Rajagopalan, Sundara;Stephens, Mark
Référence Experiments in fluids, 37, 1, page (56-64)
Publication Publié, 2004-07

Article révisé par les pairs

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Résumé :

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.