Predictions of the Structure of Turbulent, Highly Underexpanded 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 117(4), 599-604 (Dec 01, 1995) (6 pages) doi:10.1115/1.2817309 History: Received July 11, 1994; Revised February 17, 1995; Online December 04, 2007


A mathematical model capable of predicting the shock and flow structure of turbulent, underexpanded jets is described. The model is based on solutions of the fluid flow equations obtained using a second-order accurate, finite-volume integration scheme together with an adaptive grid algorithm. Closure of these equations is achieved using a k-ε turbulence model coupled to the compressible dissipation rate correction proposed by Sarkar et al. (1991a). Extending earlier work which demonstrated the ability of this model to predict the structure of moderately underexpanded jets, the present paper compares model predictions and experimental data, reported in the literature, on a number of highly underexpanded releases. The results obtained demonstrate that the model yields reliable predictions of shock structure in the near field, inviscid region of such jets, while in the far field results derived using the compressibility corrected turbulence model are adequate for predicting mean flow properties, and are superior to those obtained using a standard k-ε approach.

Copyright © 1995 by The American Society of Mechanical Engineers
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