Fluid Force Moment on a Centrifugal Impeller Shroud in Precessing Motion

[+] Author and Article Information
Yoshinobu Tsujimoto, Yoshiki Yoshida

Osaka University, Engineering Science, 1-3 Machikaneyama, Toyonaka, 560, Japan

Hideo Ohashi

Kogakuin University, Mechanical Engineering, Nishishinjuku 1-24-2, Shinjuku, Tokyo, 163-91, Japan

Norihiro Teramoto

Kubota Corporation

Shin Ishizaki

Ishikawajima Harima Heavy Industries, Inc

J. Fluids Eng 119(2), 366-371 (Jun 01, 1997) (6 pages) doi:10.1115/1.2819143 History: Received April 26, 1996; Revised January 07, 1997; Online December 04, 2007


Experimental results of fluid moment on a centrifugal impeller shroud in precessing motion are discussed based on the bulk flow model to elucidate the fundamental flow mechanism. It is shown that the backshroud/casing clearance flow and the destabilizing fluid force moment can be simulated by the bulk flow model fairly well if the measured behavior of the resistance is correctly incorporated in the model. From the calculations with and without steady and unsteady wall shear stresses, the unsteady component of the clearance flow is shown to be basically a two-dimensional inviscid flow induced by the change in the flow thickness. The effects of the leakage flow rate and the resistance at the leakage flow entry are discussed, paying attention to the steady tangential velocity of the leakage flow.

Copyright © 1997 by The American Society of Mechanical Engineers
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