Influence of a Circumferential Exit Pressure Distortion on the Flow in an Impeller and Diffuser

[+] Author and Article Information
M. Th. Sideris, R. A. Van den Braembussche

von Karman Institute for Fluid Dynamics, Chaussée de Waterloo, 72, B-1640 Rhode Saint Genèse, Belgium

J. Turbomach 109(1), 48-54 (Jan 01, 1987) (7 pages) doi:10.1115/1.3262069 History: Received December 26, 1985; Online November 09, 2009


Detailed velocity measurements, using Laser Doppler Anemometry (LDA) and static pressure measurements in the vane/ess diffuser of a centrifugal compressor, are presented. They show the relation between the circumferential variation of the pressure and the local flow in the diffuser and at the impeller exit. Theoretical calculations using an impeller-diffuser interaction model have been made. A comparison between the theoretical results and experimental data allows an evaluation of the possibilities and shortcomings of such a calculation. It also illustrates the mechanisms by which the variation of the impeller outlet velocity is defined.

Copyright © 1987 by ASME
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