机翼弹性变形对气动特性的影响

Influence of Elastic Deformation on Aerodynamic Characteristics for Wings

在非结构混合网格框架下,采用有限体积法求解了Euler方程和N-S方程。使用结构影响系数法计算机翼结构的弹性变形,通过动态网格技术实现了气动力与结构变形之间的耦合运算,计算和分析了在气动载荷作用下的机翼变形和此时的气动特性,算例分析表明:典型后掠机翼的弹性变形会使机翼产生了正的挠度和负的剖面扭转角,在弯曲和扭转的相互作用下,机翼的有效迎角减小,从而导致机翼的升力系数减小。在Euler方程和N-S方程算例中,考虑弹性变形条件下的机翼升力系数比刚性机翼的升力系数分别减小了25.3%和24.1%。

The Euler equations and N-S equations have been numerically solved with the Finite Element Method based on the unstructured hybrid mesh.The aerodynamic characteristics of the elastic wing have been investigated,during which the structural influence coefficient method has been employed to get the elastic deformation of the wing and the coupling between aerodynamics and structural deformation have been performed with the help of Dynamic Mesh Method.The results show that： the elastic deformation can cause bending and torsion on the typical back-swept wing.The interaction between bending and torsion cause decreases in the effective angle of attack,leading to decreases in the lift generated by the wing.When compared with the results of the rigid wing,the lift decreases by 25.3% and 24.1% for the Euler simulation and N-S simulation respectively.