Three-Dimensional Unsteady Flow and Forces in Centrifugal Impellers With Circumferential Distortion of the Outlet Static Pressure

[+] Author and Article Information
A. Fatsis, S. Pierret, R. Van den Braembussche

Turbomachinery Department, von Karman Institute for Fluid Dynamics, Rhode-St-Genèse, Belgium

J. Turbomach 119(1), 94-102 (Jan 01, 1997) (9 pages) doi:10.1115/1.2841015 History: Received February 11, 1995; Online January 29, 2008


This paper describes the numerical investigation of the centrifugal impeller response to downstream static pressure distortions imposed by volutes at off-design operations. An unsteady three-dimensional Euler solver with nonreflecting upstream and down-stream boundary conditions and phase-lagged periodicity conditions is used for this purpose. The mechanisms governing the unsteady flow field are analyzed. A parametric study shows the influence of the acoustic Strouhal number on the amplitude of the flow perturbations. Radial forces calculated on backward leaned and radial ending centrifugal impellers show nonnegligible influence of the impeller geometry.

Copyright © 1997 by The American Society of Mechanical Engineers
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