鸽形扑翼机构设计及翅翼周围流场分析

Design of Pigeon Flapping Wing Mechanism and Analysis of Flow Field Around Wings

为研究扑翼飞行器运动机构扑动原理和翅翼周围流场变化规律,设计鸽形扑翼飞行器扑翼机构并分析翅翼周围流场。运用四杆机构图解法计算出符合扑翼运动要求的曲柄摇杆机构参数,并对相关参数进行优化。基于计算流体力学对扑翼飞行的流场进行数值模拟计算;利用Fluent软件分析得到翅翼周围流场速度云图、湍动能云图以及升力、推力特性曲线。结果表明:鸽形扑翼飞行会引起翅翼流场流动速度发生变化,进而导致空气流动状态由层流变为湍流,湍流动能为扑翼飞行提供气动力。

In order to study the flapping mechanism of flapping wing aircraft and the flow field around the wings,the flapping wing mechanism of pigeon shaped flapping wing aircraft was designed and the flow field around the wings was analyzed.The crank rocker mechanism parameters that met the requirements of flapping wing motion were calculated by using the graphical method of four-bar mechanism,and the relevant parameters were optimized.The flow field of flapping wing was simulated based on computational fluid dynamics(CFD);the velocity cloud,turbulent kinetic energy cloud,lift and thrust characteristic curves of the flow field around the flapping wing were obtained by using Fluent software.The results show that the pigeon shaped flapping wing flight will causes the change of flow velocity in the wing flow field,which leads to the change of air flow state from laminar flow to turbulence,and the turbulent kinetic energy provides the power for flapping wing flight.