扑翼柔性变形对悬停气动特性影响的数值研究

Numerical study on the effect of flapping wing deformation on aerodynamic performance in hovering flight

摘要:

为研究扑动飞行器悬停时扑翼的变形给气动力及周围流场带来的影响,通过求解二维Navier-Stokes方程,分析了扑翼气动力及其周围流场结构随扑翼柔性变形的变化规律.结果显示,当扑翼在悬停扑动时,适当的柔性变形可以提高升力,增大升阻比,有效地改善气动特性.但是,过度的柔性变形会使扑翼的气动特性恶化,升力和升阻比随着过度的变形而减小.

Abstract:

By solving the two dimensional Navier-Stokes equations,a numerical study on the effect of flapping wing deformation on aerodynamic forces is carried out while the wing is in hovering flight,and the variations of aerodynamic forces and flow patterns around the flapping wing with the wing deformation are examined.The results show that the flapping wing provides a higher lift force when it is in an appropriate deformation and hence gives better aerodynamic performance than a rigid one.However,an excessive deformation of the wing may make the aerodynamic performance of the wing worse.