Abstract: The aerodynamic performance of wings designed by traditional methods strongly depends on flight conditions. Aiming at this problem, a deformable wing structure driven by shape memory alloy(SMA) wire is designed. The structure can automatically adjust the wing shape according to different flight states, so as to simultaneously optimize its aerodynamic performance. Firstly, the driving point of SMA driver is connected to the stringer inside the airfoil to drive the stringer up and down and deform the flexible skin. Secondly, by using the integrated optimization platform of Isight , the wing modelling and hydrodynamics analysis are conducted to achieve the optimal design of deformable wing. Finally, basing on the optimization design results and SMA constitutive relation, the driving structure scheme of deformable wing is determined. Research results show that the SMA driver can realize the deformation driving of the deformable wing, through temperature control in the range of 30- 140 ℃, the deformation of the upper and lower skins of the wing can be achieved by 0-8 mm, and the maximum lift-to-drag ratio can be increased by 21.87%.

Key words: deformable wing, SMA driver, airfoil aerodynamic optimization, lift-to-drag ratio