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The interaction of a vortex with a boundary layer

Published online by Cambridge University Press:  04 July 2016

C.P. Yeung  and
L.C. Squire
C.P. Yeung
Affiliation:
Cambridge University Engineering Department
L.C. Squire
Affiliation:
Cambridge University Engineering Department
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Summary

The three-dimensional vortex/boundary layer interaction of a type which may occur on a high-lift aerofoil has been studied. The experimental configuration simulates the trailing vortex system generated by two differentially-deflected slats which interact with an otherwise two-dimensional boundary layer developed on the wing surface under a nominal zero pressure gradient. The mean and turbulent flowfields are measured by a triple hot-wire system. The measurements show that the trailing vortex system includes the vortex sheets shed from the slats and the single vortex formed at the discontinuity between them. The single vortex moves sideways and interacts with the boundary layer as it develops downstream. During the interaction with the boundary layer, the low momentum, high turbulent-kinetic energy flow carrying negative longitudinal vorticity is entrained from the boundary layer and rolled into the vortex at the line of lateral convergence on the test surface. Likewise, at the line of lateral divergence, the high momentum, low turbulent kinetic energy flow carried by the vortex impinges on the boundary layer, suppressing the turbulent energy level and the growth of the boundary layer.

Type
Research Article
Information
The Aeronautical Journal , Volume 98 , Issue 978 , October 1994 , pp. 311 - 318
Copyright
Copyright © Royal Aeronautical Society 1994 

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