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Investigation on a Type of Flow Control to Weaken Unsteady Separated Flows by Unsteady Excitation in Axial Flow Compressors

[+] Author Affiliations
Xin-Qian Zheng, Xiao-Bo Zhou, Sheng Zhou

Beijing University of Aeronautics and Astronautics, Beijing, P. R. China

Paper No. GT2004-53167, pp. 323-330; 8 pages
doi:10.1115/GT2004-53167
From:
  • ASME Turbo Expo 2004: Power for Land, Sea, and Air
  • Volume 5: Turbo Expo 2004, Parts A and B
  • Vienna, Austria, June 14–17, 2004
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4170-7 | eISBN: 0-7918-3739-4
  • Copyright © 2004 by ASME

abstract

By solving unsteady Reynolds-averaged 2-D N-S equations discretized by a high-order scheme, the results showed that the disordered unsteady separated flow could be effectively controlled by periodic suction and blowing in a wide range of incidence, resulting in enhancement of time-averaged aerodynamic performances. The effects of unsteady excitation frequency, amplitude and excitation location were investigated in detail. The effective excitation frequency spans a wide spectrum and there is an optimal excitation frequency that is nearly equal to the Characteristic frequency of vortex shedding. Excitation amplitude exhibits a threshold value (nearly 10% in term of the ratio of maximum velocity of periodic suction and blowing to the velocity of free flow) and an optimal value (nearly 35%). The optimal excitation location is just upstream of the separation point. We also explored feasible unsteady actuators by utilizing upstream wake for constraining unsteady separation in axial flow compressors.

Copyright © 2004 by ASME

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