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Measurements of the Unsteady Flow Field Within the Stator Row of a Transonic Axial-Flow Fan: II — Results and Discussion FREE

[+] Author Affiliations
M. D. Hathaway, K. L. Suder, A. J. Strazisar, J. J. Adamczyk

Lewis Research Center, Cleveland, OH

T. H. Okiishi

Iowa State University, Ames, IA

Paper No. 87-GT-227, pp. V001T01A083; 13 pages
doi:10.1115/87-GT-227
From:
  • ASME 1987 International Gas Turbine Conference and Exhibition
  • Volume 1: Turbomachinery
  • Anaheim, California, USA, May 31–June 4, 1987
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7923-8
  • Copyright © 1987 by ASME

abstract

Results of detailed unsteady velocity field measurements made within the stator row of a transonic axial-flow fan are presented. Measurements were obtained at midspan for two different stator blade rows using a laser anemometer. The first stator row consists of double-circular-arc airfoils with a solidity of 1.68. The second stator row features controlled-diffusion airfoils with a solidity of 0.85. Both stator configurations were tested at design-speed peak efficiency conditions. In addition, the controlled-diffusion stator was also tested at near-stall design-speed conditions. The procedures developed in Part I of this paper are used to identify the “rotor-wake-generated” and “unresolved” unsteadiness from the velocity measurements. (The term “rotor-wake-generated” unsteadiness refers to the unsteadiness generated by the rotor wake velocity deficit and the term “unresolved” unsteadiness refers to all of the remaining unsteadiness which contributes to the spread in the distribution of velocities such as vortex shedding, turbulence, etc.) Auto and cross correlations of these unsteady velocity fluctuations are presented in order to indicate their relative magnitude and spatial distributions. Amplification and attenuation of both rotor-wake-generated and unresolved unsteadiness are shown to occur within the stator blade passage.

Copyright © 1987 by ASME
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