Effect of canard-chordwise blowing on the aerodynamic characteristics of blended wing body aircraft

To enhance the effect of the canard increasing lift and pitching moment coefficient of the blended-wing-body(BWB) aircraft, numerical simulation is adopted to analyze the effect of the canard-chordwise blowing on the low-speed aerodynamic characteristics of BWB configuration. By presenting the results of blowing momentum coefficient at different angles of attack, the flow mechanism of chordwise blowing device's influence on the lift and pitching moment coefficient is analyzed, followed by investigating the effect of the blowing momentum coefficient and chordwise blowing position on the low-speed aerodynamic characteristics. The numerical simulation results show that by arranging a chordwise blowing device on the upper surface of the canard, the flow pattern of canard can be significantly improved, enlarging negative pressure region on the upper surface of canard and increasing the peak negative pressure, resulting in an increase in lift coefficient of the canard and a decrease on the difficulty of the longitudinal trimming and maneuvering in the takeoff and landing of the BWB aircraft. Increasing the blowing momentum coefficient produces more favorable interference. As the chordwise blowing position moves backwards, the canard and the whole aircraft lift coefficient increases gradually and then decreases, where an optimal range of chordwise blowing position can be reached. The results of the article show that the chordwise blowing device directly improves the flow field of the canard and increases the lift and pitching moment coefficient, which provides theoretical support for the advanced research of BWB configuration aircraft.