形状记忆合金驱动变倾角翼梢小翼的变体气动收益分析

he morphing winglet can adjust the cant-angle or the height actively according to the flight environment. It fits more flight missions, which makes it important for the future smart aircrafts. The key factors for morphing winglet design restricted by aerodynamics, actuation, and adaptive control. This paper designs a variable cant-angle winglet driven by shape memory alloy (SMA) springs, which can be mounted on a scale size wind tunnel model with limited internal space. The driving system and scheme are developed, the ground test for the morphing process is carried out, and the aerodynamic benefits from the morphing are measured in the wind tunnel tests. The results also compared with the computational fluid dynamic (CFD) simulations. When the cant angle increases from 15 to 35 for the present scale size winglet model, a 6.5% increase of the lift/drag ratio is found in the numerical simulation, while a 14.7% increase of the lift/drag ratio is found in the wind tunnel tests.