Experimental study of the leading edge vortex-flap of double-delta wing

A wind tunnel experiment was conducted to investigate the inner-vortex-flap and outer-vortex-flap of double-delta wing. Various factors affecting the efficiency of vortex-flap, including the state of leading-edge wing, the shape of vortex-flap, the skew of vortex-flap, the combination of inner-vortex-flap and outer-vortex-flap, and the efficiency of trailing edge flap were discussed. Especially, in the light of the difference between the vortex field of inner-vortex-flap and outer-vortex-flap, the design features of inner-vortex-flap and outer-vortex-flap of multiple planform shape wing have been analyzed, which provide a reference for the design of vortex-flap of double-delta wing. The results show that proper design of the leading edge vortex-flaps and trailing edge flaps can optimize the low-speed performance of large sweep double-delta wing.