Secondary Flows and Vortex Motion in a High-Efficiency Backswept Impeller at Design and Off-Design Conditions

[+] Author and Article Information
C. Hah

GE Research and Development Center, Schenectady, NY

H. Krain

DFVLR-Institut für Antriebstechnik, Köln, Federal Republic of Germany

J. Turbomach 112(1), 7-13 (Jan 01, 1990) (7 pages) doi:10.1115/1.2927425 History: Received January 27, 1989; Online June 09, 2008


The three-dimensional viscous flow field of a 4.7:1 pressure ratio backswept impeller was studied experimentally and numerically by using laser velocimetry and an advanced three-dimensional viscous code. The impeller was designed by a CAD method, and a maximum rotor efficiency of 94 percent was achieved. Both the experimental and the theoretical approach revealed comparatively smooth impeller discharge velocity profiles at all three operating conditions (design, choke, and near surge) differing widely from the well-known jet/wake-type flow pattern. The three-dimensional viscous code was used for detailed flowfield studies, i.e., secondary flows; vortex motion and tip-clearance effects were analyzed at design and off-design conditions. The comparison of experimental and numerical results indicates that the tip-clearance effect should be properly modeled to predict the impeller flow pattern properly and that optimum shape of rotor exit flow pattern can be obtained by controlling the swirling vortex motion.

Copyright © 1990 by The American Society of Mechanical Engineers
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