Unstable Flows in the Vaneless Diffuser of a Centrifugal Compressor at Low Flow Rates PUBLIC ACCESS

[+] Author Affiliations
S. Mizuki

Hosei University, Koganei, Tokyo, Japan

C. W. Park

Data Communications Corp. of Korea, Seoul, Korea

B. E. L. Deckker

University of Saskatchewan, Saskatoon, Canada

Paper No. 85-IGT-7, pp. V001T02A001; 9 pages
  • ASME 1985 Beijing International Gas Turbine Symposium and Exposition
  • Volume 1: Aircraft Engine; Turbomachinery
  • Beijing, People’s Republic of China, September 1–7, 1985
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7942-9
  • Copyright © 1985 by ASME


Time-averaged and time-dependent velocity distributions have been measured in the the vaneless diffuser of an experimental compressor. Changes in these distributions have been identified with the onset of rotating stall and fully developed stall. At very small flow rates, an approach to equilibrium has been observed. Frequency spectra analyses have revealed the existence of low frequency disturbance waves which, together with the large adverse pressure gradient prevailing in the diffuser, could lead to selective wave amplification and surging.

Copyright © 1985 by ASME
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