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Journal of the Acoustical Society of America / Volume 118 / Issue 6 / AEROACOUSTICS, ATMOSPHERIC SOUND [28]

Effect of a downstream ventilated gas cavity on turbulent boundary layer wall pressure fluctuation spectra

J. Acoust. Soc. Am. Volume 118, Issue 6, pp. 3506-3512 (2005); (7 pages)

Steven D. Young1, Timothy A. Brungart1, Gerald C. Lauchle1, and Michael S. Howe2

1Applied Research Laboratory, The Pennsylvania State University, P.O. Box 30, State College, Pennsylvania 16804-0030
2College of Engineering, Boston University, 110 Cummington Street, Boston, Massachusetts 02215

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An analytical and experimental investigation is made of the effect of a 2-D ventilated gas cavity on the spectrum of turbulent boundary layer wall pressure fluctuations upstream of a gas cavity on a plane rigid surface. The analytical model predicts the ratio of the wall pressure spectrum in the presence of the cavity to the blocked wall pressure spectrum that would exist if the cavity were absent. The ratio is found to oscillate in amplitude with upstream distance (−x) from the edge of the cavity. It approaches unity as −ωx/Uc→∞, where ω is the radian frequency and Uc is the upstream turbulence convection velocity. To validate these predictions an experiment was performed in a water tunnel over a range of mean flow velocities. Dynamic wall pressure sensors were flush mounted to a flat plate at various distances upstream from a backward facing step. The cavity was formed downstream of the step by injecting carbon dioxide gas. The water tunnel measurements confirm the predicted oscillatory behavior of the spectral ratio, as well as its relaxation to unity as −ωx/Uc→∞. For −ωx/Uc>7 the cavity has a negligible influence on the upstream wall pressure fluctuations.

© 2005 Acoustical Society of America

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KEYWORDS and PACS

Keywords

aeroacoustics, underwater sound, boundary layer turbulence, convection, pipe flow, cavitation, fluid oscillations

PACS

  • 43.28.Ra

    Generation of sound by fluid flow, aerodynamic sound and turbulence

  • 43.30.Nb

    Noise in water; generation mechanisms and characteristics of the field

ARTICLE DATA

History
Received 03 Feb 2005
Accepted 12 Sep 2005
Revised 02 Sep 2005
Digital Object Identifier
http://dx.doi.org/10.1121/1.2109367

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

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