Measurements of mean and fluctuating wall shear stress beneath spanwise-invariant separation bubbles |
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Authors: | P E Hancock |
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Institution: | (1) School of Mechanical and Materials Engineering University of Surrey Guildford, Surrey GU2 5XH, UK, GB |
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Abstract: | Pulsed-wire measurements of wall shear stress have been made beneath two separation bubbles. In one a cross flow was generated
by means of a (25°) swept separation line. Fluctuating stresses in orthogonal “streamwise” and cross-flow directions are very
nearly equal and independent of at least moderate cross flow velocity. These fluctuations are largely determined by large-scale
motions in the outer flow, whereas the mean shear stresses are not. The pdf of the “streamwise” fluctuations is unchanged
by the cross flow. When a cross flow is present the pdf of the cross-flow stresses is similar to the “streamwise” pdf. Dependence
on Reynolds number is the same in both flows.
Received: 10 April 1998/Accepted: 17 July 1998 |
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