An Experimental Analysis of Vortex Trapping Techniques

[+] Author and Article Information
Todd W. Riddle, Jin Tso, Russell M. Cummings

Aeronautical Engineering Department, California Polytechnic State University, San Luis Obispo, CA 93407

Alan J. Wadcock

Sterling Software, Moffett Field, CA 94035

J. Fluids Eng 121(3), 555-559 (Sep 01, 1999) (5 pages) doi:10.1115/1.2823504 History: Received October 09, 1997; Revised April 19, 1999; Online December 04, 2007


An experimental verification is presented for the theoretical vortex trapping concept. A suction orifice located along one wall of a water channel test section was used to simulate a point sink to trap spanwise vortices downstream of a backward-facing step and between two parallel fences. Results from the backward-facing step geometry indicated an increase in the sink strength required to hold a vortex as the sink is positioned closer to the step, closely following previous theoretical predictions made using conformal mapping. The experimental data also showed reasonable agreement with the theoretical position for optimum vortex trapping. Flow visualization has shown a three-dimensional cross-stream effect due to bending of the forced-vortex core by suction. Results from the dual-fence geometry, on the other hand, verified the ability to use a lower level of suction for vortex trapping when compared with the backward-facing step.

Copyright © 1999 by The American Society of Mechanical Engineers
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