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Jet column modes in both a plane jet and a passively modified plane jet subject to acoustic excitation

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Abstract

Use is made of acoustic excitation to enhance the coherent vortical structures that form in both a plane jet and a passively modified plane jet. The Strouhal number for the preferred mode based on the nozzle height of the jet is found to be unaffected by the passive modification. The existence of the jet column mode of stable pairing in the excited plane jet is unambiguously confirmed. Measurements in the excited and modified plane jet show that the passive modification suppresses this mode. Finally, the work shows the existence of a new mode of stable pairing. Both time- and phase-averaged measurements are presented to examine this mode.

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Authors and Affiliations

  1. School of Mechanical and Manufacturing Engineering, The University of New South Wales, 2052, Sydney, NSW, Australia

    J. F. Olsen

  2. Department of Mechanical Engineering, The University of Newcastle, 2308, Callaghan, NSW , Australia

    S. Rajagopalan & R. A. Antonia

Authors
  1. J. F. Olsen
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  2. S. Rajagopalan
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  3. R. A. Antonia
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Correspondence to J. F. Olsen.

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Olsen, J.F., Rajagopalan, S. & Antonia, R.A. Jet column modes in both a plane jet and a passively modified plane jet subject to acoustic excitation. Exp Fluids 35, 278–287 (2003). https://doi.org/10.1007/s00348-003-0663-4

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  • DOI: https://doi.org/10.1007/s00348-003-0663-4

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