The effect of blowing/suction jet on the aerodynamic performance of airfoil NACA0012 at low Reynolds number

Based on large eddy simulation obtained from Favre filtering, the numerical simulations for the blow/suction jet on the upper surface of airfoil NACA0012 have been conducted at Reynolds number Re=10⁴ and angle of attack α=6°. The effects of jet location and velocity on airfoil aerodynamic performance have been discussed from the variations of streamlines pattern, velocity contour, upper and lower surface pressure coefficients, and displacement thickness of upper surface boundary layer. The results show that, the jet location has a great influence on the aerodynamic performance of the airfoil and the control effects of suction jet is obviously better than that of blowing jet. For the suction jet, the front edge suction can effectively increase the lift and reduce the drag, and it can also suppress flow separation of airfoil, and restrain the disturbance of aerodynamic parameters of airfoil during flight. The optimum suction location gradually moves downstream with the increase of suction velocity. Relatively, the control effect of blowing jet on aerodynamic coefficient of airfoil is not good enough. However, the blowing jet at the middle and rear edge can reduce the aerodynamic disturbances, and the larger the blowing velocity, the more obvious its effect.