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RESEARCH PAPERS

Hydrodynamic and Thermal Measurements in a Turbulent Boundary Layer Recovering From Concave Curvature

[+] Author and Article Information
M. D. Kestoras, T. W. Simon

Mechanical Engineering Department, University of Minnesota, Minneapolis, MN 55455

J. Turbomach 114(4), 891-898 (Oct 01, 1992) (8 pages) doi:10.1115/1.2928044 History: Received April 26, 1992; Online June 09, 2008

Abstract

The behavior of a boundary layer on a flat wall downstream of sustained concave curvature is documented. Experiments are conducted with negligible streamwise pressure gradient and a low free-stream turbulence intensity (0.6 percent). The turbulent boundary layer has a moderate strength of curvature (δ/R = 0.024) at the entry to the recovery section. Results show that the skin friction coefficient, which increases over the concave wall, decreases rapidly at first over the recovery wall, then slowly approaches flat-wall values. Stanton number values decrease rapidly, undershooting expected flat-wall values. A discussion of this behavior, supported by profile measurements, is given. Effects include destabilization in the concave-curved flow and rapid streamline readjustment (acceleration) at the end of the curved section. Goertler vortices established on the curved wall persist onto the recovery wall; however, their effects weaken.

Copyright © 1992 by The American Society of Mechanical Engineers
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