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Irrotational fluctuations near a turbulent boundary layer

Published online by Cambridge University Press:  28 March 2006

P. Bradshaw
P. Bradshaw
Affiliation:
Aerodynamics Division, National Physical Laboratory
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Abstract

A verification of some of the predictions of the theory of Phillips (1955) is presented, and the relation between one-dimensional and two-dimensional wavenumber spectra is discussed. The convection velocity of the irrotational field deduced from measurements of the frequency spectrum alone appears to be about 0.9U1 in the frequency range carrying most of the energy. It follows that the pressure-fluctuation spectrum is proportional to the velocity-fluctuation spectrum and varies as ω2 at low frequency. The discrepancy between this result and measurements of wall-pressure spectra is plausibly attributed to extraneous sound.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 27 , Issue 2 , 2 February 1967 , pp. 209 - 230
Copyright
© 1967 Cambridge University Press

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