Fluidic oscillating valves have been used in order to apply unsteady boundary layer injection to “repair” the separated flow of a model diffuser, where the hump pressure gradient represents that of the suction surface of a highly loaded stator vane. The fluidic actuators employed in this study consist of a fluidic oscillator that has no moving parts or temperature limitations and is therefore more attractive for implementation on production turbomachinery. The fluidic oscillators developed in this study generate an unsteady velocity with amplitudes up to 60% rms of the average operating at nondimensional blowing frequencies in the range of . These actuators are able to fully reattach the flow and achieve maximum pressure recovery with a 60% reduction of injection momentum required and a 30% reduction in blowing power compared with optimal steady blowing. Particle image velocimetry velocity and vorticity measurements have been performed, which show no large-scale unsteadiness in the controlled boundary layer flow.
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October 2009
Research Papers
Boundary Layer Separation Control With Fluidic Oscillators
Kevin Kirtley
Kevin Kirtley
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Ciro Cerretelli
Kevin Kirtley
J. Turbomach. Oct 2009, 131(4): 041001 (9 pages)
Published Online: June 30, 2009
Article history
Received:
October 27, 2006
Revised:
July 22, 2008
Published:
June 30, 2009
Citation
Cerretelli, C., and Kirtley, K. (June 30, 2009). "Boundary Layer Separation Control With Fluidic Oscillators." ASME. J. Turbomach. October 2009; 131(4): 041001. https://doi.org/10.1115/1.3066242
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