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Measurements of Secondary Flows Within a Cascade of Curved Blades and in the Wake of the Cascade FREE

[+] Author Affiliations
Ronald Lasser

Bell Telephone Laboratories, Holmdel, NJCarnegie-Mellon University, Pittsburgh, PA

Wilfred T. Rouleau

Carnegie-Mellon University, Pittsburgh, PA

Paper No. 83-GT-24, pp. V001T01A012; 7 pages
doi:10.1115/83-GT-24
From:
  • ASME 1983 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • Phoenix, Arizona, USA, March 27–31, 1983
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7951-1
  • Copyright © 1983 by ASME

abstract

A laser-Doppler anemometer was used to measure the three-dimensional velocity field within a typical turbine blade cascade. The blades had a 12.7 cm chord, a turning angle of 104.8°, and a shape conforming to the camber line of a commercial turboexpander. The cascade was operated at a Reynolds number of 1.25×105. Strong secondary velocities, ranging up to 35 percent of the primary flow velocity, were found, resulting from the development of counter-rotating vortices within the blade passages. Large midspan velocity defects in the primary flow were coincident with these high secondary flows. The secondary flow persisted throughout the near wake region.

Copyright © 1983 by ASME
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