微型飞行器低雷诺数矩形扑翼非定常气动特性的数值模拟

Numerical simulation on unsteady aerodynamics of rectangular flapping wing at low Reynolds number for micro air vehicles(MAVs)

采用双时间步方法求解三维可压缩非定常N-S方程,数值模拟了微型飞行器低雷诺数矩形扑翼的非定常绕流,首先将得到的结果与文献进行了对比,数据间具有较好的一致性。然后针对不同的展弦比、减缩频率及初始攻角,计算了矩形扑翼的非定常气动特性及表面流态和动态压力分布,并分析了翼尖涡对扑翼非定常气动特性的影响。

The dual time-stepping algorithm is used to solve the 3D unsteady compressible N-S equations. The unsteady flowfields around rectangular flapping wings at low Reynolds number for MAVs are numerically simulated, Numerical results are in preferable consistency with literature results. Then the unsteady aerodynamic characteristics, surface streamlines and dynamic pressure distributions of flapping wings with different aspect ratios, reduced frequencies and angles of attack are investigated. The effect of tip vortex on aerodynamic characteristics of flapping wings is also analyzed.