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Low-frequency pressure fluctuations in axisymmetric turbulent boundary layers

Published online by Cambridge University Press:  19 April 2006

Ronald L. Panton ,
A. L. Goldman ,
R. L. Lowery  and
M. M. Reischman
Ronald L. Panton
Affiliation:
Mechanical Engineering Department, The University of Texas, Austin, Texas 78712
A. L. Goldman
Affiliation:
Mechanical Engineering Department, The University of Texas, Austin, Texas 78712 Present address: Texas Technological University, Lubbock, Texas.
R. L. Lowery
Affiliation:
Mechanical and Aerospace Engineering Department, Oklahoma State University, Stillwater, Oklahoma
M. M. Reischman
Affiliation:
Mechanical and Aerospace Engineering Department, Oklahoma State University, Stillwater, Oklahoma Present address: Naval Undersea Center, San Diego, California.
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Abstract

Measurements of wall pressure fluctuations under a turbulent boundary layer were made on the fuselage of a sailplane. This flow offers a noise-free environment with a low free stream turbulence level. The axisymmetric boundary layer undergoes natural transition and develops in a zero pressure gradient region. Spectra of the wall pressure were found to decrease at low frequency in agreement with calculations based upon a turbulence–mean shear interaction mechanism. Velocity fluctuations at several positions within and outside the boundary layer were measured and correlated with the wall pressure. A special conditional correlation method was also employed to find the contribution of various velocity fluctuations to the wall pressure. A conditioning signal was formed based upon the signs of u and v and the turbulent–non-turbulent nature of the flow. This signal was time lagged and correlated with the wall pressure signal. It was found that in the outer portion of the boundary layer (y/δ > 0·5), irrotational motions were more highly correlated with the wall pressure than vortical motion.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 97 , Issue 2 , 25 March 1980 , pp. 299 - 319
Copyright
© 1980 Cambridge University Press

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