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Fluctuating turbulent stresses in the noise-producing region of a jet

Published online by Cambridge University Press:  29 March 2006

Ian S. F. Jones
Ian S. F. Jones
Affiliation:
Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario Present address: Department of Mechanical Engineering, University of Sydney.
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Abstract

Measurements of the fluctuating turbulent stresses (uiuj)’ in the mixing layer of a two-dimensional jet are presented. These include the intensity, spatial correlation and the wave-number frequency spectra of the fluctuating stresses.

The acoustic spectrum perpendicular to the axis of a jet can be approximated with the aid of assumptions about jet similarity and a knowledge of the four-dimensional wave-number frequency spectrum at zero wave-number. In the present paper the four-dimensional spectrum was inferred from measured two-dimensional spectra and the self-noise spectrum perpendicular to a round jet estimated. Good agreement was obtained with measured acoustic spectra.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 36 , Issue 3 , 1 May 1969 , pp. 529 - 543
Copyright
© 1969 Cambridge University Press

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