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Study of the Acoustic Oscillations of Flow Over Cavities: Part 2 — Sound Reduction

[+] Author Affiliations
Pascal Hémon

Ecole Polytechnique – CNRS, Palaiseau, France

Xavier Amandolèse

Institut Aérotechnique, Saint-Cyr l’Ecole, France

Françoise Santi

CNAM, Paris, France

Jan Wojciechowski

Warsaw University of Technology, Warsaw, Poland

Paper No. IMECE2002-33376, pp. 917-923; 7 pages
doi:10.1115/IMECE2002-33376
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 experimental results obtained with a deep cavity, like an Helmholtz resonator, excited by an airflow. The resonance under the action of the vortices generated in the shear layer is well described and quantified. The mounting of actuators, based on a few piezo-electric elements, allows to generate a series of two-dimensional vortices forced at a frequency which is different than the natural resonance frequency. The sound level in the cavity is strongly decreased and the broadband noise of the turbulence only remains.

Copyright © 2002 by ASME

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