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Development of flow field when a symmetrical underexpanded sonic jet impinges on a flat plate

Published online by Cambridge University Press:  20 April 2006

J. Iwamoto  and
B. E. L. Deckker
J. Iwamoto
Affiliation:
Mechanical Engineering Department, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N OWO Permanent Address: Tokyo Denki University, 2–2 Nishiki-Cho, Kanda, Chiyoda-Ku Tokyo, Japan.
B. E. L. Deckker
Affiliation:
Mechanical Engineering Department, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N OWO
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Abstract

A differencing scheme known as the ‘Fluid-in-Cell’ method has been used in the numerical simulation of a choked jet of air impinging on a flat plate. Before sonic conditions are applied at the nozzle exit, the field of interest is at rest at the ambient pressure and temperature. The instantaneous application of sonic conditions at the nozzle exit is tantamount to the sudden appearance of a normal shock wave whose strength is determined by the experimental conditions.

The results of the simulation describe the decay of the initial shock wave and its reflection at the plate; the formation of a second shock wave and its merging with the reflected shock giving rise to a detached shock wave which oscillates; and the growth and subsequent motion of a toroidal vortex that is generated between this shock wave and the plate. The results show clearly how the flow field which has been observed in physical experiments under stable operating conditions is developed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 113 , December 1981 , pp. 299 - 313
Copyright
© 1981 Cambridge University Press

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