Experiment of flow separation control in highly loaded compressor cascade corner by endwall plasma aerodynamic actuation

To discover the flow characters and main influencing rules of flow separation control in highly loaded compressor cascade corner by endwall plasma aerodynamic actuation (PAA), microsecond pulse and nanosecond pulse plasma flow control experiments under different flowfields and actuation conditions were carried out. Results show that PAA on the endwall can effectively prevent the flow separation in cascade corner, and actuation effects drop with the increase of angle of attack, but become best at angle of attack of 3 degree; microsecond discharge PAA effects drop with the increase of freestream velocity but increase with the increase of the actuation voltage and duty cycles, and the optimum unsteady pulsed excitation frequency is 500 Hz; compared to microsecond discharge PAA, nanosecond discharge PAA is more effective at higher freestream velocity; nanosecond discharge PAA effects are improved with the rising actuation voltage; the actuation frequency is of vital importance, and the effects are improved with the increase of actuation frequency, but when the actuation frequency is 5 kHz, the effects will drop.