Effect of canard sweeps on lift increment with canard-spanwise blowing

On the basis of wind-tunnel force-measurement, pressure-measurement and water-tunnel flow visualization, the effect and law of canard sweeps on lift increment were studied for the canard configurations with a 50° swept delta-wing and different delta-canards on the condition of without canard-spanwise blowing and with canard-spanwise blowing. The results show that the lift coefficient and angles of stall are increased when add a canard in front of the wing, so the canard can be used as an element for vortex control. The magnitude of increased lift-coefficient has a relationship with the interference of wing's and canard's vortexes. When canard-spanwise blowing, the bigger is canard sweep, the larger is the angle beginning to appear lift increment and the angle decreasing the lift increment, but the smaller is the percentage of maximum lift increment. So in order to take full advantage of canard configuration at high angle of attack, the middle sweep is worthy of taking into account.