Flow Past Circular Cylinder With Different Surface Configurations

[+] Author and Article Information
Y. C. Leung

Hong Kong Electric Co., Ltd., Hong Kong

N. W. M. Ko, K. M. Tang

Department of Mechanical Engineering, University of Hong Kong, Hong Kong

J. Fluids Eng 114(2), 170-177 (Jun 01, 1992) (8 pages) doi:10.1115/1.2910012 History: Received September 20, 1990; Online May 23, 2008


Measurements of the mean pressure distributions and Strouhal numbers on partially grooved cylinders with different groove subtend angles were made over a Reynolds number range of 2.0×104 to 1.3×105 which was within the subcritical regime of smooth cylinder. The Strouhal number, pressure distributions, and their respective coefficients were found to be a function of the groove subtend angles. In general, a progressive shift of the flow regime to lower Reynolds number was observed with higher subtend angle and a subtend angle of 75 deg was found for optimum drag reduction. With the configuration of asymmetrical groove surface, lower drag, and higher lift coefficients were obtained within the same Reynolds number range. Wake traverse and boundary layer results of the asymmetric grooved cylinder indicated that the flows at the smooth and groove surfaces lied within different flow regimes and a downward shift of the wake.

Copyright © 1992 by The American Society of Mechanical Engineers
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