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RESEARCH PAPERS: Noise Control and Acoustics

An Experimental Study of the Flow and Wall Pressure Field Around a Wing-Body Junction

[+] Author and Article Information
M. A. Z. Hasan, M. J. Casarella

Mechanical Engineering Department, The Catholic University of America, Washington, DC 20064

E. P. Rood

David Taylor Naval Ship & Center, Bethesda, MD 20084

J. Vib., Acoust., Stress, and Reliab 108(3), 308-314 (Jul 01, 1986) (7 pages) doi:10.1115/1.3269344 History: Received May 01, 1985; Online November 23, 2009

Abstract

The flow and wall-pressure field around a wing-body junction has been experimentally investigated in a quiet, low-turbulence wind tunnel. Measurements were made along the centerline in front of the wing and along several spanwise locations. The flow field data indicated that the strong adverse pressure gradient on the upstream centerline causes three-dimensional flow separation at approximately one wing thickness upstream and this induced the formation of the horseshoe root vortex which wrapped around the wing and became deeply embedded within the boundary layer. The wall-pressure fluctuations were measured for their spectral content and the data indicate that the effect of the adverse pressure gradient is to increase the low-frequency content of the wall pressure and to decrease the high-frequency content. The wall pressure data in the separated region, which is dominated by the horseshoe vortex, shows a significant increase in the low-frequency content and this characteristic feature prevails around the corner of the wing. The outer edge of the horseshoe vortex is clearly identified by the locus of maximum values of RMS wall pressure.

Copyright © 1986 by ASME
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