Experimental Investigation of Blade Loading Effects at Design Flow in Rotating Passages of Centrifugal Impellers

[+] Author and Article Information
Nicholas H. Hesse

Trojan Technologies Inc., 3020 Gore Road, London, Ontario, Canada, N5V 4T7

J. H. G. Howard

Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1

J. Fluids Eng 121(4), 813-823 (Dec 01, 1999) (11 pages) doi:10.1115/1.2823542 History: Received April 01, 1998; Revised July 06, 1999; Online December 04, 2007


Laser-Doppler Anemometry (LDA) was used to study the effect of blade loading on the relative velocity field in a rotating passage of a centrifugal-pump impeller. Two variations of the impeller, 8-bladed and 16-bladed, were investigated. The measured primary and secondary velocities and turbulence show that the effect of blade loading is not that previously predicted. The 16-blade impeller with high blade loading has a rapidly thickening suction side boundary layer, suggesting the onset of transient separation near the exit. However, for the 8-blade impeller with even higher blade loading, the onset of separation is not indicated at any measured location in the impeller. At the design flow, it is concluded that the stronger potential eddy and lower solidity associated with the very high blade loading caused a change in the secondary flow pattern, retarding the growth and the likelihood of transitory separation of the suction side boundary layer.

Copyright © 1999 by The American Society of Mechanical Engineers
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