Analysis of the Flow in Vaneless Diffusers With Large Width-to-Radius Ratios

[+] Author and Article Information
H.-S. Dou, S. Mizuki

Department of Mechanical Engineering, College of Engineering, Hosei University, Koganei-city, Tokyo 184, Japan

J. Turbomach 120(1), 193-201 (Jan 01, 1998) (9 pages) doi:10.1115/1.2841381 History: Received February 01, 1996; Online January 29, 2008


The flow in vaneless diffusers with large width-to-radius ratios is analyzed by using three-dimensional boundary-layer theory. The variations of the wall shear angle in the layer and the separation radius of the turbulent boundary layer versus various parameters are calculated and compared with experimental data. The effect of the separation point on the performance of vaneless diffusers and the mechanism of rotating stall are discussed. It is concluded that when the flow rate becomes very low, the reverse flow zone on the diffuser walls extends toward the entry region of diffusers. When the rotating jet-wake flow with varying total pressure passes through the reverse flow region near the impeller outlet, rotating stall is generated. The influences of the radius ratio on the reverse flow occurrence as well as on the overall performance are also discussed.

Copyright © 1998 by The American Society of Mechanical Engineers
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