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Study of the Acoustic Oscillations by Flows Over Cavities: Part 1 — Internal Flows

[+] Author Affiliations
Xavier Amandolèse, Clotilde Regardin

Institut Aérotechnique, Saint-Cyr l’Ecole, France

Pascal Hémon

Ecole Polytechnique – CNRS, Palaiseau, France

Paper No. IMECE2002-33375, pp. 907-916; 10 pages
doi:10.1115/IMECE2002-33375
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • 5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-3659-2 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

We present a study of acoustic oscillations induced by an internal airflow over a shallow and a deep cavity. The Kelvin-Helmholtz instability is interacting with an acoustic mode of the duct, leading to a resonance which produces a very high sound level. The influence of upstream boundary layer thickness and neck thickness is studied. Some results obtained by modifying the upstream lip shape, by crenel addition, are also given. It is also shown that the numerical simulations using a lattice-gas method give relatively good results by comparison with the experiments. Especially the resonance with the duct acoustics was qualitatively reproduced.

Copyright © 2002 by ASME

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