Off Design Flow Measurements in a Centrifugal Compressor Vaneless Diffuser PUBLIC ACCESS

[+] Author Affiliations
Ali Pinarbasi, Mark W. Johnson

University of Liverpool, Liverpool, UK

Paper No. 94-GT-042, pp. V001T01A011; 7 pages
  • ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • The Hague, Netherlands, June 13–16, 1994
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7883-5
  • Copyright © 1994 by ASME


Detailed measurements have been taken of the 3-d velocity field within the vaneless diffuser af a backswept law speed centrifugal compressor using hat wire anemometry. A 16% below and an 11% above design flowrate were used in the present study. Results at both flowrates show how the blade wake mixes out more rapidly than the passage wake. Strong secondary flows inherited from the impeller at the higher flowrate delay the mixing out of the circumferential velocity variations, but at both flowrates these circumferential variations are negligible at the last measurement station. The measured tangential/radial flaw angle is used to recommend optimum values far the vaneless space and vane angle for design of a vaned diffuser.

Copyright © 1994 by ASME
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