A Diffusion Factor Correlation for Centrifugal Impeller Stalling

[+] Author and Article Information
C. Rodgers

Solar Turbines International, International Harvester Group, San Diego, Calif.

J. Eng. Power 100(4), 592-601 (Oct 01, 1978) (10 pages) doi:10.1115/1.3446403 History: Received December 16, 1977; Online July 14, 2010


Test results pertaining to the stalling characteristics of centrifugal compressor impellers with parallel wall vaneless diffusers are presented and studied to correlate the coincidence of stall with a limiting impeller diffusion capability. It is suggested that a modified diffusion factor, to include the effects of meridional curvature, provides improved stall correlation for a wide specific speed range of backswept impeller types. The possibility of applying this diffusion factor to high loading radially bladed impellers is discussed as dependent upon blockage and windage plus recirculation effects. Use of the diffusion factor limit in the preliminary design of most common turbomachinery types, incompressible and compressible, to assess impeller (or rotor) stall is conceivable.

Copyright © 1978 by ASME
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