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Relative Flow Structure at Exit From an Axial Compressor Rotor in Rotating Stall PUBLIC ACCESS

[+] Author Affiliations
R. Cheng

Nanjing Gas Turbine Institute, People’s Republic of China

H. Ekerol, J. W. Railly

University of Birmingham, UK

Paper No. 84-GT-240, pp. V001T01A069; 7 pages
doi:10.1115/84-GT-240
From:
  • ASME 1984 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • Amsterdam, The Netherlands, June 4–7, 1984
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7946-7
  • Copyright © 1984 by ASME

abstract

The phase-lock-averaging (PLA) technique is used in association with a traverse gear mounted on an axial compressor rotor to explore the flow field at exit from the rotor during rotating stall. The technique requires the use of a trigger hot-wire anemometer also mounted on the rotor to ensure the proper location of the stall cell in relation to the measurement probe. The probe consists of a three-wire non-orthogonal array which may be traversed radially and peripherally over a complete blade passage. By a systematic adjustment of the probe orientation angle, the presence of reverse flow is detected. A mathematical procedure for the determination of the magnitude and direction of the flow vector is presented. On the basis of a large collection of phase-locked data it is demonstrated that the leading and trailing edges of the cell travel at a non-uniform rate and in such a way as to vary cyclically in peripheral extent with a period related to the blade passing fequency. The peripheral distribution of the flow vector at successive instants of relative time is also produced from the data collection and the evolution of the stall cell structure is presented.

Copyright © 1984 by ASME
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