Experimental study on the effect of fluidic oscillator jet position on the performance of a high speed compressor cascade

Abstract

In order to further improve the performance of the cascade, this paper focused on a high-load diffuser cascade and a pulsed-type fluidic oscillator for flow control was also applied. Experiments were conducted at design incidence of 0° and near stall incidence of +4°, investigating different jet positions of the fluidic oscillators. The results indicate that at Mach number of 0.67 and design incidence, the pulsed jet effect is optimal when the jet position of the fluidic oscillator is at 35% of chord, resulting in an 8.74% decrease in total pressure loss. At Mach number of 0.5 the total pressure loss decreases by 12.08%. At the Mach number of 0.67 near the stall incidence of +4°, the fluidic oscillator jet position at 7% of chord shows the most significant decrease in total pressure loss, which is 5.3%. When the pulsed jet is positioned at the separation starting point of the corner, the low-pressure region on the suction surface near the endwall decreases, while the high-pressure region on the pressure surface increases, enhancing the pressure expansion capability of the cascade. The pulsed jet can successfully decrease the vorticity in the passage, such as passage vortex, trailing shedding vortex and concentrated shedding vortex, and can resist the transverse secondary flow in the cascade passage, reducing the range of corner separation in the spanwise direction and total pressure loss.