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RESEARCH PAPERS

Self-Excited Shear-Layer Oscillations in a Multi-Cavity Channel With a Steady Mean Velocity

[+] Author and Article Information
K. D. Stephanoff

Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015

J. Fluids Eng 108(3), 338-342 (Sep 01, 1986) (5 pages) doi:10.1115/1.3242583 History: Received August 07, 1985; Online October 26, 2009

Abstract

Self-excited shear-layer oscillations are observed in the cavity flows of a multi-cavity channel when the mean velocity through the channel exceeds a critical value. These coherent shear-layer oscillations appear as one or sometimes two selectively-amplified frequencies in the Fourier-analyzed signals of hot-film gauges that are sintered into the channel walls. At a constant velocity above the critical velocity, the self-excited oscillations are present in only a few cavities. Downstream from these cavities there are oscillations in the cavity flows but one or two selectively-amplified frequencies are not observed. The self-excited oscillations move upstream and the selectively-amplified frequency increases as the mean velocity through the channel is increased.

Copyright © 1986 by ASME
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