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RESEARCH PAPERS

Predictions of Impacting Sonic and Supersonic Jets

[+] Author and Article Information
P. S. Cumber, M. Fairweather

British Gas plc, Research and Technology, Gas Research Centre, Loughborough LE11 3QU, England

S. A. E. G. Falle

Department of Applied Mathematics, The University of Leeds, Leeds LS2 9JT, England

J. R. Giddings

Mantis Numerics Ltd., 46 The Calls, Leeds LS2 7EY, England

J. Fluids Eng 119(1), 83-89 (Mar 01, 1997) (7 pages) doi:10.1115/1.2819123 History: Received October 12, 1994; Revised June 07, 1996; Online December 04, 2007

Abstract

A mathematical model of sonic and supersonic jets, validated previously by the present authors for the prediction of moderately and highly underexpanded free jets, is used to simulate the near field structure of jets which impact a flat surface orthogonally, and its accuracy assessed by comparing model predictions with experimental data available in the literature. For impacting, moderately underexpanded jets, results derived from the model are found to be in close agreement with data on the location of both free jet shocks, and the stand-off shock formed adjacent to the impacted surface. In addition, the model provides reasonable estimates of density within the free jet and stagnation regions of such flows, with the existence, or otherwise, of bubbles being successfully predicted. Measurements of pressure occurring on the surface of the impacted plate, produced by the impingement of both sonic and supersonic jets, are also predicted with reasonable accuracy, although the decaying amplitude of spatially periodic pressure oscillations within the wall jet region of these flows is slightly over predicted in some cases.

Copyright © 1997 by The American Society of Mechanical Engineers
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