Lateral Fluid Forces on Whirling Centrifugal Impeller (1st Report: Theory)

[+] Author and Article Information
H. Shoji

Institute of Engineering Mechanics, University of Tsukuba, Ibaraki-ken, 305 Japan

H. Ohashi

Department of Mechanical Engineering, University of Tokyo, Tokyo, 113 Japan

J. Fluids Eng 109(2), 94-99 (Jun 01, 1987) (6 pages) doi:10.1115/1.3242647 History: Received January 30, 1986; Online October 26, 2009


Lateral fluid forces acting on a rotating centrifugal impeller in whirling motion are analyzed using unsteady potential flow theory. Impellers operating in diffusers with and without vanes are modeled and the fluid forces calculated for different whirl speeds and flow rates. The influences of these parameters are clarified by parametric calculations. The results for whirling impellers operating in vaneless diffusers show that the fluid forces exert a damping effect on the rotor whirling motion at all operating conditions. The results for impellers operating in vaned diffusers or guide vanes show that the time averaged values of fluid forces remain almost unchanged, while there are significant instantaneous fluctuations due to the impeller/guide vane interactions.

Copyright © 1987 by ASME
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