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TECHNICAL PAPERS

An Experimental Study of the Acoustic Oscillations by Flows Over Cavities

[+] Author and Article Information
Xavier Amandolèse, Clotilde Regardin

Institut Aérotechnique, 15, rue Marat, F-78210 Saint-Cyr l’Ecole, France

Pascal Hémon

Hydrodynamics Laboratory-LadHyX, Ecole Polytechnique-CNRS, F-91128 Palaiseau, France

J. Vib. Acoust 126(2), 190-195 (May 04, 2004) (6 pages) doi:10.1115/1.1688761 History: Received July 01, 2002; Revised November 01, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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References

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Tam,  C. K. W., and Block,  P. J. W., 1978, “On the Tones and Pressure Oscillations Induced by Flow Over Rectangular Cavities,” J. Fluid Mech., 89, pp. 373–399.
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Hemon, P., 2000, “Mesure des caractéristiques acoustiques de singularités aérauliques en présence de l’écoulement,” SIA Colloquium on Confort automobile et ferroviaire, Le Mans, 15 & 16 novembre, SIA paper No CAF/00-28.
Rossiter, J. E., 1964, “Wind Tunnel Experiments on the Flow Over Rectangular Cavities at Subsonic and Transonic Speed,” Aero. Res. Counc. R. & M., No. 3438.

Figures

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Maximum pressure levels and corresponding frequencies versus Hg+δ1 for the shallow cavity
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Maximum pressure levels and corresponding frequencies versus Hg, shallow cavity, small boundary layer thickness
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Shear layer velocity profiles, shallow cavity, Hg=8 mm,M=0.187, 0.88 L from upstream lip
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Shear layer velocity profiles, shallow cavity, Hg=8 mm,M=0.187, midlength of the neck
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Dimensionless frequencies versus M, shallow cavity. □: Hg=2 mm, ○: Hg=8 mm.
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Boundary layer profiles for the shallow cavity. ○: Smooth, □: Roughness 1, ▵: Roughness 2.
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Transfer function Pv/Pe versus Uo, deep cavity
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Configuration of the study
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Upstream lip modification for sound attenuation, “crenels 1/4”
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Cavity pressure level and corresponding frequency versus M, shallow cavity. □: Hg=2 mm, ○: Hg=8 mm.
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Cavity pressure level and corresponding frequency versus Uo, deep cavity
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Boundary layer profile at X=−2 L, deep cavity
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Maximum pressure levels and corresponding frequencies versus δ1, shallow cavity, Hg=8 mm

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