Drag Reduction of a Cylinder/Endwall Junction Using the Iceformation Method

[+] Author and Article Information
R. S. LaFleur

Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699

L. S. Langston

Mechanical Engineering Department, University of Connecticut, Storrs, CT 06268

J. Fluids Eng 115(1), 26-32 (Mar 01, 1993) (7 pages) doi:10.1115/1.2910107 History: Received August 02, 1991; Online May 23, 2008


The iceformation design method was used to reduce the drag of a juncture between a cylinder and flat endwall. Ice was formed on a subfreezing flat endwall in a warmer laminar water flow. The ice shape was influenced by and altered the three-dimensional separated boundary layer and the cylinder wake. Preliminary experiments were used to indicate control parameter relationships. An adaptive selection theory was used to determine optimal control parameters. A sample optimal contour was generated and tested for juncture drag performance. High Reynolds number wind tunnel drag tests showed that the iceform contour had an average of 18 percent lower drag than a flat plate juncture given the same upstream boundary layer conditions. Flow visualizations showed that the iceform contour produced three larger diameter vortices compared to the laminar four vortex model of Baker (1979).

Copyright © 1993 by The American Society of Mechanical Engineers
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