Experimental Studies on Control of Delta Wing Aerodynamics

摘要

The drooping apex flap, effectively reducing the angle of attack of the portion of the wing closest to the apex, can delay vortex breakdown, promote lift-to-drag ratio, and postpone the onset of stall. The stalling angle increases as the length of the apex flap increases, and for the 50%c apex flap, a shift in angle of stall of around 10 deg is obtained, meaning that the apex flap can improve the rolling moment and enhance the stability of pitch-up greatly. The effectiveness of the bigger flap on increasing lift at low angles of attack was supassed by the smaller flap, but the inverse is true at high angles of attack. Moreover, the improvements in the lift coefficient for the combination of the two apex flaps were more effective than for the single flap.