Rotating Stall Flow and Dangerous Blade Excitation of Centrifugal Compressor Impeller: Part 2 — Case Study of Blade Failure PUBLIC ACCESS

[+] Author Affiliations
H. Hasemann, U. Haupt, D. Jin, U. Seidel, J. Chen, M. Rautenberg

University of Hannover, Germany

Paper No. 91-GT-103, pp. V001T01A045; 8 pages
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7898-9
  • Copyright © 1991 by ASME


Following a case of blade failure in running the test into unsteady rotating stall regime at 16000 rpm for a centrifugal compressor with backswept impeller, systematic unsteady flow investigation has been conducted, in order to clarify the cause of the failure, for the same compressor with a dublicated impeller. The doubled frequency of 2 cell rotating stall excitation, which is happened in the present case in the range of resonant frequencies, has been found to potentially impose the blade failure. Another source of dangerous excitation was found to be the excitation of large-number cell rotating stall. Some study has also been conducted to analyse the influencing parameters of the large-number stall cell phenomenon, which shows a trend of alleviating the dangerous excitation with increasing the diffuser inlet radius ratio or decreasing the diffuser vane inlet angle.

Copyright © 1991 by ASME
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