Tip Leakage in a Centrifugal Impeller

[+] Author and Article Information
T. Z. Farge, M. W. Johnson, T. M. A. Maksoud

Department of Mechanical Engineering, The University of Liverpool, Liverpool, L69 3BX, United Kingdom

J. Turbomach 111(3), 244-249 (Jul 01, 1989) (6 pages) doi:10.1115/1.3262262 History: Received January 06, 1988; Online November 09, 2009


The effects of tip leakage have been studied using a 1-m-dia shrouded impeller where a leakage gap is left between the inside of the shroud and the impeller blades. A comparison is made with results for the same impeller where the leakage gap is closed. The static pressure distribution is found to be almost unaltered by the tip leakage, but significant changes in the secondary velocities alter the size and position of the passage wake. Low-momentum fluid from the suction-side boundary layer of the measurement passage and tip leakage fluid from the neighboring passage contribute to the formation of a wake in the suction-side shroud corner region. The inertia of the tip leakage flow then moves this wake to a position close to the center of the shroud at the impeller outlet.

Copyright © 1989 by ASME
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