Compressible Flow Ejectors: Part I—Development of a Finite-Difference Flow Model

[+] Author and Article Information
K. R. Hedges

Atomic Energy of Canada Ltd., Sheridan Park, Ontario

P. G. Hill

Department of Mechanical Engineering, Queen’s University, Kingston, Ontario

J. Fluids Eng 96(3), 272-281 (Sep 01, 1974) (10 pages) doi:10.1115/1.3447151 History: Received February 07, 1974; Online October 12, 2010


A general method of calculating two-dimensional (plane and axisymmetric) mixing of a compressible jet in variable-area ducts has been developed. The method incorporates finite-difference approximations to the conservation equations, and is applicable to a wide range of Mach number, mass flow ratio, and initial conditions. The model was based on mixing length approximations deduced from boundary-layer and free-jet mixing for the upstream portion of the flow, and on a new mixing length distribution for the downstream zone which is entirely occupied by shear flow. The method has been tested and found satisfactory with existing data on boundary layer, constant-diameter duct entrance flow, constant-pressure jet mixing, and jet mixing in variable-area ducts. Part II of the paper describes tests of the method with new data from an experimental ejector study.

Copyright © 1974 by ASME
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