Effect of Multistage Circulation Control on Blade Aerodynamic Performance

To improve the low aerodynamic efficiency and reduce high energy consumption of a single-stage circulation control wing, multistage wing was designed. By combining force measurement particle image velocimetry (PIV), flow-field characteristics an aerofoil were investigated with respect to increase in number blowing slots, changes coefficient, different ratios for three slots. The results revealed that maximum lift-to-drag ratio resulting from simultaneous into slots increased by 95.3% compared absence control. With two stages observed: separation supercirculation In stage, lift drag coefficients significantly decreased, respectively. coefficient gradually whereas remained unchanged. When (blowing flow slots) 3:1:2, could reach 143.48%. effects slot positions on found vary. Slot.1 Slot.3 terms reduction lift, respectively, evident, influence Slot.2 between these played role jet relay. PIV curvature trailing-edge streamline, thus increasing equivalent camber improving lift. At angle attack, this demonstrated effect.