This research investigates different dielectric barrier discharge (DBD) actuator configurations for affecting tip leakage flow and suppressing stall inception. Computational investigations were performed on a low speed rotor with a highly loaded tip region that was responsible for stall-onset. The actuator was mounted on the casing upstream of the rotor leading edge. Plasma injection had a significant impact on the predicted tip-gap flow and improved stall margin. The effect of changing the actuator forcing direction on stall margin was also studied. The reduction in stalling flow was closely correlated with a reduction in loading parameter that quantifies mechanisms responsible for end-wall blockage generation. The actuation reduced end-wall losses by increasing the static pressure of tip-gap flow emerging from blade suction-side. Lastly, an approximate speed scaling developed for the DBD force helped estimate force requirements for stall margin enhancement of transonic rotors.
Control of Tip-Clearance Flow in a Low Speed Axial Compressor Rotor With Plasma Actuation
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Jothiprasad, G., Murray, R. C., Essenhigh, K., Bennett, G. A., Saddoughi, S., Wadia, A., and Breeze-Stringfellow, A. (June 29, 2011). "Control of Tip-Clearance Flow in a Low Speed Axial Compressor Rotor With Plasma Actuation." ASME. J. Turbomach. March 2012; 134(2): 021019. https://doi.org/10.1115/1.4003083
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