A Simple Model for the Critical Swirl in a Swirling Sudden Expansion Flow

[+] Author and Article Information
W. L. H. Hallett

Department of Mechanical Engineering, University of Ottawa, Ottawa, Canada K1N 6N5

J. Fluids Eng 110(2), 155-160 (Jun 01, 1988) (6 pages) doi:10.1115/1.3243528 History: Received August 14, 1987; Online October 26, 2009


A simple momentum integral model for estimating the minimum or “critical” swirl intensity required to produce central recirculation in a swirling sudden expansion flow is presented. An explicit equation is given for the critical swirl as a function of expansion ratio and inlet velocity profile shape, the latter expressed by the radius of the solid body vortex core and a parameter describing an axial velocity maximum or minimum on the axis. The model is tested against experimental data for expansion diameter ratios from 1.25 to 3.0 and a variety of inlet conditions, and found to give good predictions.

Copyright © 1988 by ASME
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