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Self-sustained oscillation of a jet impinging upon a Helmholtz resonator

Published online by Cambridge University Press:  21 April 2006

W. M. Jungowski  and
G. Grabitz
W. M. Jungowski
Affiliation:
Max-Planck-Institut für Strömungsforschung, D-3400 Göttingen, Bunsenstr. 10, FR Germany Presently research scientist NOVA/Husky Research Corporation, Calgary, Canada.
G. Grabitz
Affiliation:
Max-Planck-Institut für Strömungsforschung, D-3400 Göttingen, Bunsenstr. 10, FR Germany
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Abstract

A planar, sonic, underexpanded air jet induced strong and self-sustained flow oscillation. The jet was bounded by two parallel walls extending between the nozzle and the Helmholtz resonator opposite. This oscillation was characterized by large pressure amplitudes in the resonator and periodic displacement of a detached shock wave. The observed phenomena were in some measure similar to those occurring with Hartmann-Sprenger tubes. Based on the experimental results, including Mach-Zehnder interferograms and fluctuating pressure and velocity measurements, the properties of the oscillation have been described and a model for theoretical analysis has been established. Experimental and numerical investigations have made possible a description of the oscillation mechanism, which is of the relaxation type.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 179 , June 1987 , pp. 77 - 103
Copyright
© 1987 Cambridge University Press

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