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Space–time results for a separating turbulent boundary layer using a rapidly scanning laser anemometer

Published online by Cambridge University Press:  20 April 2006

B. Chehroudi
Affiliation:
Department of Civil and Mechanical Engineering, Southern Methodist University, Dallas, Texas 75275 Present address: Mechanical and Aerospace Engineering Department, Princeton University, Princeton, NJ 08544.
R. L. Simpson
Affiliation:
Department of Civil and Mechanical Engineering, Southern Methodist University, Dallas, Texas 75275 Present address: The Department of Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061.

Abstract

A rapidly scanning one-velocity-component directionally sensitive fringe-type laser-Doppler anemometer which scans the measurement volume perpendicular to the optical axis of the transmitting optics was used to investigate the flow structure of the steady freestream separated turbulent boundary layer of Simpson, Chew & Shivaprasad (1981a). Space–time correlations were obtained for the first time in a separated turbulent boundary layer and showed that the integral lengthscale Ly for the large eddies grows in size towards detachment, although the ratio of this lengthscale to the boundary-layer thickness remains constant. Results also indicate local dependence of the backflow on the middle and outer regions of the boundary layer at a given instant in time.

Type
Research Article
Copyright
© 1985 Cambridge University Press

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References

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