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Experimental investigation of turbulent shear flow with quadratic mean-velocity profiles

Published online by Cambridge University Press:  29 March 2006

H. K. Richards  and
J. B. Morton
H. K. Richards
Affiliation:
Department of Engineering Science and Systems, University of Virginia, Charlottesville
J. B. Morton
Affiliation:
Department of Engineering Science and Systems, University of Virginia, Charlottesville
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Abstract

Three turbulent shear flows with quadratic mean-velocity profiles are generated by using an appropriately designed honeycomb and parallel-rod grids with adjustable rod spacing. The details of two of the flow fields, with quadratic mean-velocity profiles with constant positive mean-shear gradients ($\partial^2\overline{U}_1/\partial X^2_2 >0$), are obtained, and include, in the mean flow direction, the development and distribution of mean velocities, fluctuating velocities, Reynolds stresses, microscales, integral scales, energy spectra, shear correlation coefficients and two-point spatial velocity correlation coefficients. A third flow field is generated with a quadratic mean velocity profile with constant negative mean-shear gradient ($\partial^2\overline{U}_1/\partial X^2_2 < 0$), to investigate in the mean flow direction the effect of the change in sign on the resulting field. An open-return wind tunnel with a 2 × 2 × 20 ft test-section is used.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 73 , Issue 1 , 13 January 1976 , pp. 165 - 188
Copyright
© 1976 Cambridge University Press

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