Effect of Trailing Edge Suction on Coherent Structures in Near Wake

[+] Author and Article Information
S. D. Sharma, R. K. Sahoo

Department of Aerospace Engineering, Indian Institute of Technology, Bombay, India

J. Fluids Eng 120(2), 378-384 (Jun 01, 1998) (7 pages) doi:10.1115/1.2820658 History: Received April 17, 1997; Revised October 20, 1997; Online December 04, 2007


Experimental results, obtained from hot-wire measurements using a conditional sampling technique, demonstrate feasibility of controlling large-scale spanwise vortices (coherent structures) in the near wake region behind a rectangular base by means of suction through a slit at just one of the trailing edges. The suction thus employed, is found to influence the near wake topology with strong asymmetry and disturb the net vorticity balance. Moreover, a significant reduction in the base drag is achieved as a consequence of the trailing edge suction. The mechanism of the drag reduction is understood to lie in a marked change in the wake dynamics including attenuation in the size and strength of the coherent structures.

Copyright © 1998 by The American Society of Mechanical Engineers
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