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The response of a turbulent boundary layer to lateral divergence

Published online by Cambridge University Press:  19 April 2006

A. J. Smits ,
J. A. Eaton  and
P. Bradshaw
A. J. Smits
Affiliation:
Department of Aeronautics, Imperial College, London Present address; Mechanical Engineering Department, University of Melbourne.
J. A. Eaton
Affiliation:
Department of Aeronautics, Imperial College, London Present address; Engineering Department, University of Leicester.
P. Bradshaw
Affiliation:
Department of Aeronautics, Imperial College, London
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Abstract

Measurements have been made in the flow over an axisymmetric cylinder-flare body, in which the boundary layer developed in axial flow over a circular cylinder before diverging over a conical flare. The lateral divergence, and the concave curvature in the transition section between the cylinder and the flare, both tend to destabilize the turbulence. Well downstream of the transition section, the changes in turbulence structure are still significant and can be attributed to lateral divergence alone. The results confirm that lateral divergence alters the structural parameters in much the same way as longitudinal curvature, and can be allowed for by similar empirical formulae. The interaction between curvature and divergence effects in the transition section leads to qualitative differences between the behaviour of the present flow, in which the turbulence intensity is increased everywhere, and the results of Smits, Young & Bradshaw (1979) for a two-dimensional flow with the same curvature but no divergence, in which an unexpected collapse of the turbulence occurred downstream of the curved region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 94 , Issue 2 , 25 September 1979 , pp. 243 - 268
Copyright
© 1979 Cambridge University Press

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