三维仿生悬停扑翼的时间非对称扑动气动特性

Aerodynamic performance of time asymmetric flapping of a three-dimensional flapping hovering bionic wing

基于对现有黄蜂飞行观察实验的分析,建立了不同下扑和上挥时间非对称扑动悬停扑翼运动轨迹模型,并采用数值求解三维层流Navier-Stokes(N-S)方程的方法,研究了采用不同下扑和上挥时间比的仿生悬停扑翼气动特性.结果表明采用适当的时间非对称扑动可以增强悬停扑翼的气动性能.进一步通过对不同时间非对称扑动扑翼流场分析得出,采用时间非对称扑动不但可以增强使扑翼产生高升力的旋转环流机制,而且还可以增强扑翼表面涡流和展向流的强度,从而使扑翼具有更好的气动性能.

Based on the analysis of the bumblebees flight, the kinematic model of time asymmetric flapping hovering wing was established, and the effect of different time asym- metric flapping on the aerodynamic performance of the wing was numerically studied by sol- ving three-dimensional laminar Navier-Stokes （N-S） equation. The results show that the wing with appropriate time asymmetric flapping possesses enhancement aerodynamic per- formance. Through the analysis of flow field of different time asymmetric flapping wings, it was also found that the enhancement rotational circulation, stronger leading edge vortex and spanwise flow were observed for the wing with appropriate time asymmetric flapping, hence leading to enhancement aerodynamic performance.