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

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Abstract

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.

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Acknowledgments

The support of the Australian Research Council is gratefully acknowledged. The authors are thankful to Dr. L. Djenidi for a careful review of the manuscript.

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Authors and Affiliations

  1. Discipline of Mechanical Engineering, University of Newcastle, 2308, N.S.W., Australia

    P. Burattini, R. A. Antonia, S. Rajagopalan & M. Stephens

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  1. P. Burattini
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  2. R. A. Antonia
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  3. S. Rajagopalan
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  4. M. Stephens
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Correspondence to P. Burattini.

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Burattini, P., Antonia, R.A., Rajagopalan, S. et al. Effect of initial conditions on the near-field development of a round jet. Exp Fluids 37, 56–64 (2004). https://doi.org/10.1007/s00348-004-0784-4

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  • DOI: https://doi.org/10.1007/s00348-004-0784-4

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