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Time Resolved Measurements in an Annular Compressor Cascade With High Aerodynamic Loading

[+] Author Affiliations
Jörg Weidenfeller, Martin Lawerenz

University of Kassel, Kassel, Germany

Paper No. GT2002-30439, pp. 751-758; 8 pages
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 5: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3610-X | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME


In order to identify unsteady flow phenomena this paper presents experimental investigations inside an isolated compressor cascade under off-design conditions. The results of extensive time resolved measurements, which were performed by piezo-resistive pressure sensors and hot wire anemometry show an interaction of aerodynamic and acoustic mechanisms. For a certain operating range the measurements indicate, that vortices, caused by boundary layer separations, oscillate with the pipe mode of the test section. In addition so-called rotating instabilities occur at high blade loading. They rotate with 48% of the circumferential component of the inlet velocity.

Copyright © 2002 by ASME



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