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Vortex Shedding and Wave Propagation in Transonic Two-dimensional Cavity Flows

Vortex Shedding and Wave Propagation in Transonic Two-dimensional Cavity Flows Flows over a two-dimensional rectangular cavity, which length to depth ratios are 1 and 2, were studied experimentally and numerically at Mach numbers, 0.55 to 0.85. The flow pattern and unsteady wave propagation were visualized by using a schlieren technique. The pressure fluctuation in the cavity was analyzed by FFT. Its spectrum distribution was discussed for several flow Mach numbers. The experimental results were compared with the previous theory in terms of the discrete frequencies. Comparing experimental results and those theoretical predictions, oscillation modes in transverse and longitudinal directions were discussed with visualized flow images. A numerical simulation was carried out by a finite difference method at a free stream Mach number of 0.8. The numerical simulation demonstrated the periodic formation of the vortices at the leading edge and shedding to the trailing edge. A comparison of the numerical result with experimental observation shows a good agreement in terms of flow pattern in the cavity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Visualization IOS Press

Vortex Shedding and Wave Propagation in Transonic Two-dimensional Cavity Flows

Journal of Visualization , Volume 3 (4) – Jan 1, 2001

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Publisher
IOS Press
Copyright
Copyright © 2001 by IOS Press, Inc
ISSN
1343-8875
eISSN
1875-8975
Publisher site
See Article on Publisher Site

Abstract

Flows over a two-dimensional rectangular cavity, which length to depth ratios are 1 and 2, were studied experimentally and numerically at Mach numbers, 0.55 to 0.85. The flow pattern and unsteady wave propagation were visualized by using a schlieren technique. The pressure fluctuation in the cavity was analyzed by FFT. Its spectrum distribution was discussed for several flow Mach numbers. The experimental results were compared with the previous theory in terms of the discrete frequencies. Comparing experimental results and those theoretical predictions, oscillation modes in transverse and longitudinal directions were discussed with visualized flow images. A numerical simulation was carried out by a finite difference method at a free stream Mach number of 0.8. The numerical simulation demonstrated the periodic formation of the vortices at the leading edge and shedding to the trailing edge. A comparison of the numerical result with experimental observation shows a good agreement in terms of flow pattern in the cavity.

Journal

Journal of VisualizationIOS Press

Published: Jan 1, 2001

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