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Published March 1985 | Published
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Active Control of Cavity Shear Layer Oscillation

Gharib, M. ORCID icon


Influence of externally forced initial flow conditions on axisymmetric cavity shear layer were studied. A sinusoidally heated strip upstream of the cavity excited Tollmien-Schlichting waves which, after amplification by the boundary layer, were introduced to the cavity shear layer. By choosing forcing frequencies within the range of shear layer receptivity, it was possible to control frequency and amplitude of the oscillations and consequently control the cavity drag.

Additional Information

© 1985 American Institute of Aeronautics and Astronautics, Inc. This paper is based on work from the Ph.D Thesis by the author which was carried out at the Jet Propulsion Laboratory, California Institute of Technology. The work was sponsored by U. S. Army Research Office Contract No. 7134E and National Science Foundation Grant No. CME-7723541. The author is grateful for assistance from Professors A. Roshko, H. W. Liepman, D. M. Nosenchuck and Dr. V. Sarohia. Paper title varies in AIAA Aerospace Research Central database: Response of the cavity shear layer oscillations to external forcing.

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