模型翼拍动中动态柔性变形效应的数值研究

A Numerical Study on the Aerodynamics Effects of Time-Changing Wing Flexible Deformation in its Flapping Motions

利用数值求解二维不可压缩Navier-Stokes方程,研究了在两种拍动基元运动中,模型翼动态柔性变形对其气动性能的影响.由柔性翼和刚性翼的结果比较发现,附加惯性效应是动态变形影响气动性能的主要原因,变形加速率决定了瞬时气动性能改变量的大小,相比之下,动态变形对气动性能时均值的影响则弱得多.

A computational fluid dynamic study, based on 2-D incompressible Navier-Stokes Equations, is presented to investigate the aerodynamics effects of time-changing wing flexible deformation in its flapping. Two elementary motions of the wing flapping, i. e. accelerated translation and non-uniform rotation, are studied, in which both the flexible and rigid wing cases are compared. It is revealed that in comparison of the rigid wing case, the wing deformation acceleration in the flexible wing case leads to the added inertial effect, which causes a lot of change in instantaneous aerodynamic performance of the wing. With regard to the time-averaged one, the flexibility effect is much less.