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Flow oscillations in a duct with a rectangular cross-section

Published online by Cambridge University Press:  11 April 2006

J. S. Anderson ,
W. M. Jungowski ,
W. J. Hiller  and
G. E. A. Meier
J. S. Anderson
Affiliation:
Max-Planck-Institut für Strömungsforschung, Germany Present address: Department of Mechanical Engineering, The City University, London.
W. M. Jungowski
Affiliation:
Max-Planck-Institut für Strömungsforschung, Germany Present address: Warsaw Technical University.
W. J. Hiller
Affiliation:
Max-Planck-Institut für Strömungsforschung, Germany
G. E. A. Meier
Affiliation:
Max-Planck-Institut für Strömungsforschung, Germany
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Abstract

A two-dimensional configuration has been investigated in which air flows through a convergent nozzle and expands abruptly into a rectangular duct of larger cross-section which terminates in a plenum chamber. Three different types of oscillation have been observed in the downstream duct. At low plenumchamber pressures an oscillation occurs towards the exit of the duct as the boundary layer of the flow becomes alternately separated and attached. At increasing plenum pressure a shock-pattern oscillation takes place in which a change from a normal shock to oblique shocks occurs during a cycle. At still greater plenum pressures a base-pressure oscillation occurs which influences the entire duct flow downstream of the abrupt change in cross-section. The amplitudes of the oscillation can be as high as 10% of the rest state, and the frequency of the base-pressure oscillations can be predicted approximately from one-dimensional gasdynamic theory.

The unsteady duct phenomena have been studied by synchronizing instantaneous pressures measured by quartz pressure transducers with interferograms obtained with a Mach–Zehnder interferometer.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 79 , Issue 4 , 23 March 1977 , pp. 769 - 784
Copyright
© 1977 Cambridge University Press

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