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Response of the Cavity Shear Layer Oscillations to External Forcing

Gharib, M. (1987) Response of the Cavity Shear Layer Oscillations to External Forcing. AIAA Journal, 25 (1). pp. 43-47. ISSN 0001-1452. doi:10.2514/3.9576.

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Influence of externally forced initial flow conditions on axisymmetric cavity shear layer was studied. A sinusoidally heated strip upstream of the cavity excited Tollmien-Schlichting waves that, after amplification by the boundary layer, were introduced to the cavity shear layer. It is shown that by selecting a forcing frequency, which satisfies a phase difference criterion between two comers of the cavity and has an amplitude that is above the threshold amplitude, it is possible to excite a naturally nonoscillating shear layer. It is also shown that the frequency and amplitude of the oscillation in the self sustained mode can be controlled through external forcing. By using a feed-back control scheme, up to 40% reduction of the velocity fluctuation level can be obtained.

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Additional Information:© 1986 American Institute of Aeronautics and Astronautics, Inc. Presented as Paper 85-0528 at the AIAA Shear Flow Control Conference, Boulder, CO, March 12-14, 1985; received Sept. 17, 1985; revision received Feb. 24, 1986. 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 7134E. The author is grateful for assistance in various forms from A. Roshko, H. W. Liepmann, D. M. Nosenchuck, and V. Sarohia.
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Army Research Office (ARO)7134E
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AIAA Paper85-0528
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Official Citation: M. GHARIB. "Response of the cavity shear layer oscillations to external forcing", AIAA Journal, Vol. 25, No. 1 (1987), pp. 43-47. doi: 10.2514/3.9576
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41372
Deposited By: Tony Diaz
Deposited On:17 Sep 2013 23:00
Last Modified:10 Nov 2021 04:29

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