低雷诺数下微型飞行器主动变形机翼非定常气动特性数值分析

以微型飞行器的气动外形设计为研究背景,通过数值求解N-S方程分析了主动变形柔性机翼的气动特性。空间离散格式采用中心有限体积法,时间推进采用双时间推进方法,其中子迭代过程由隐式LU-SSOR方法完成。在动网格技术的基础上,模拟分析了薄翼面上作行波运动的流场。计算结果发现,该行波翼型的气动特性相比于刚性翼型有明显改善,有效地抑制了大攻角下大尺度流动分离,同时升阻比提高了约35%,起到了显著的增升减阻的作用。本文的工作对于进一步的柔性机翼优化具有良好的理论研究与数值模拟的参考价值。

Numerical analysis of unsteady viscous flow around actively deformed flexible airfoil for micro air vehicles under low Reynolds number

The aerodynamic performance of flexible airfoil has been simulated using unsteady N-S equation.In this solver,the cell-centered finite volume method in space and dual time stepping method in time are used here.Based on the mesh adaptation technique,the flow around the thin airfoil with traveling wavy wall has been simulated.The results show that the flexible airfoil can restrain the separation phenomena under large angle of attack effectively.Compared with the rigid airfoil,the lift-to-drag ratio has been increased by 35%.The results also provide the further research of flexible airfoil with good theory and numerical simulation foundation.