By solving unsteady Reynolds-averaged Navier-Stokes 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 incidences, resulting in enhancement of time-averaged aerodynamic performances of an axial compressor cascade. 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 terms 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 the upstream wake for constraining unsteady separation in axial flow compressors.
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July 2005
Technical Papers
Investigation on a Type of Flow Control to Weaken Unsteady Separated Flows by Unsteady Excitation in Axial Flow Compressors
Xin-qian Zheng,
Xin-qian Zheng
Chinese National Key Laboratory of Aerodynamics and Thermodynamics of Aeroengine
, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P. R. China
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Xiao-bo Zhou,
Xiao-bo Zhou
Chinese National Key Laboratory of Aerodynamics and Thermodynamics of Aeroengine
, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P. R. China
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Sheng Zhou
Sheng Zhou
Chinese National Key Laboratory of Aerodynamics and Thermodynamics of Aeroengine
, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P. R. China
Search for other works by this author on:
Xin-qian Zheng
Chinese National Key Laboratory of Aerodynamics and Thermodynamics of Aeroengine
, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P. R. China
Xiao-bo Zhou
Chinese National Key Laboratory of Aerodynamics and Thermodynamics of Aeroengine
, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P. R. China
Sheng Zhou
Chinese National Key Laboratory of Aerodynamics and Thermodynamics of Aeroengine
, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P. R. ChinaJ. Turbomach. Jul 2005, 127(3): 489-496 (8 pages)
Published Online: March 1, 2004
Article history
Received:
October 1, 2003
Revised:
March 1, 2004
Citation
Zheng, X., Zhou, X., and Zhou, S. (March 1, 2004). "Investigation on a Type of Flow Control to Weaken Unsteady Separated Flows by Unsteady Excitation in Axial Flow Compressors." ASME. J. Turbomach. July 2005; 127(3): 489–496. https://doi.org/10.1115/1.1860572
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