Active flow control has been applied to the suction surface of stator vanes in a low speed axial compressor. Injection from the suction surface has been shown to reduce separation on vanes that were induced to separate by increasing the vane stagger angle by 3° deg. Various configurations were investigated including injector geometry (slots versus holes) and type of injection (steady versus unsteady). Unsteady injection was realized using two different approaches; external actuation through a high frequency valve and embedded actuation using a fluidic device internal to the vane. Using total pressure loss through the vane passage as a metric, reductions in area-averaged loss of 25% were achieved using injected mass flow rates on the order of 1% of compressor throughflow. The development of a tracking control algorithm was also explored for the purpose of closed-loop control. A reliable method of detecting surface separation was implemented using unsteady pressure measurements on the compressor casing near the vane suction surface.
Active Flow Separation Control of a Stator Vane Using Embedded Injection in a Multistage Compressor Experiment
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003. Manuscript received by the IGTI December 2002; final revision March 2003. Paper No. 2003-GT-38863. Review Chair: H. R. Simmons.
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Culley , D. E., Bright, M. M., Prahst, P. S., and Strazisar, A. J. (March 26, 2004). "Active Flow Separation Control of a Stator Vane Using Embedded Injection in a Multistage Compressor Experiment ." ASME. J. Turbomach. January 2004; 126(1): 24–34. https://doi.org/10.1115/1.1643912
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