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Comparison of Steady and Unsteady Secondary Flows in a Turbine Stator Cascade PUBLIC ACCESS

[+] Author Affiliations
Gregory J. Hebert, William G. Tiederman

Purdue University, West Lafayette, IN

Paper No. 89-GT-79, pp. V001T01A045; 10 pages
doi:10.1115/89-GT-79
From:
  • ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Toronto, Ontario, Canada, June 4–8, 1989
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7913-9
  • Copyright © 1989 by ASME

abstract

The effect of periodic rotor wakes on the secondary flow structure in a turbine stator cascade was investigated. A mechanism simulated the wakes shed from rotor blades bypassing cylindrical rods across the inlet to a linear cascade installed in a recirculating water flow loop. Velocity measurements showed a passage vortex, similar to that seen in steady flow, during the time associated with undisturbed fluid. However, as the rotor wake passed through the blade row, a large crossflow toward the suction surface was observed in the midspan region. This caused the development of two large areas of circulation between the midspan and endwall regions, significantly distorting and weakening the passage vortices.

Copyright © 1989 by ASME
This article is only available in the PDF format.

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