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Rotating Stall Measurements in the Vaneless Diffuser of a Radial Flow Compressor PUBLIC ACCESS

[+] Author Affiliations
P. M. Ligrani, R. Van Den Braembussche

von Karman Institute for Fluid Dynamics, Rhode Saint Genèse, Belgium

M. Roustan

Société Creusot-Loire, Le Creusot, France

Paper No. 82-GT-257, pp. V001T01A087; 10 pages
doi:10.1115/82-GT-257
From:
  • ASME 1982 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • London, England, April 18–22, 1982
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7956-6
  • Copyright © 1982 by ASME

abstract

Results from an experimental study of flow behavior at the inlet of a vaneless diffuser of a centrifugal compressor are presented. Hot-film measurements and measurement results from a crossed hot-wire probe are discussed for operating points having inlet flow coefficients ranging from 0.006 to 0.019 at different Reynolds numbers. Instantaneous, time-averaged, and phase-averaged absolute velocity and flow angle at the diffuser inlet are deduced from the hot-wire signals after correction for mean density variations. These results show how flow behavior varies in stable, rotating stall and surge regimes of compressor operation. The critical flow angle at the onset of rotating stall shows agreement with other measurements confirming the importance of diffuser inlet width and diffuser inlet flow angle on the onset of rotating stall in vaneless diffusers.

Copyright © 1982 by ASME
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