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RESEARCH PAPERS

Interference Drag of a Turbulent Junction Vortex

[+] Author and Article Information
F. J. Pierce

Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0238

S. K. Nath

E. I. duPont, Richmond, VA 23261

J. Fluids Eng 112(4), 441-446 (Dec 01, 1990) (6 pages) doi:10.1115/1.2909423 History: Received September 17, 1990; Online May 23, 2008

Abstract

The interference drag identified with the junction of a streamlined cylindrical body and a flat plate was investigated. The junction drag was calculated from a set of detailed, self consistent, high quality data using a control volume approach. The drag for the isolated flat plate and streamlined cylinder making up the junction was calculated using boundary-layer solvers together with surface pressure measurements. For the particular and relatively thick body under consideration, the results show a significant increase in drag due to the junction. These and other available results indicate that the interference drag has a systematic dependence on the thickness to chord ratio. The junction vortex wake increases the downstream flat plate drag significantly. Because of this effect, a unique value for the drag force, drag coefficient, or induced drag coefficient for a junction vortex flow would require that the geometry be specified in detail. The induced drag and the total pressure losses identified with the junction are also reported.

Copyright © 1990 by The American Society of Mechanical Engineers
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