Swirling Flow Through Annular Diffusers With Conical Walls

[+] Author and Article Information
R. P. Lohmann, S. J. Markowski

United Technologies Corporation, Pratt and Whitney Aircraft Group, Commercial Products Division, East Hartford, Conn. 06108

E. T. Brookman

The Research Corporation of New England, Wethersfield, Conn.

J. Fluids Eng 101(2), 224-229 (Jun 01, 1979) (6 pages) doi:10.1115/1.3448939 History: Received October 19, 1978; Online October 12, 2010


The performance of a series of diffusers of various lengths, area ratios and cant angles was determined experimentally over a range of inlet flow swirl angles between axial and 48 degrees. The results indicate that increases in the inlet swirl angle and the cant angle, particularly in combination, lead to increased distortion of the meridional velocity profile at the diffuser exit. With a swirling throughflow separation occurs at the inner wall and is encountered at progressively lower area ratios as the inlet swirl angle is increased. The tangential component of the flow is relatively independent of the meridional flow in that the angular momentum is essentially conserved and a high degree of similarity is found in these profiles at the diffuser exit.

Copyright © 1979 by ASME
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