仿生翼型对半主动扑翼捕能性能的影响

为了分析仿生翼型对半主动扑翼捕能性能的影响，该文在Fluent流体求解器的基础上，通过二次开发，编制了一套可有效求解流体流动、扑翼主动转动和被动往复扑动的计算程序。在此基础上，研究仿蜻蜓翼型、仿海鸥翼型、NACA0012和NACA0015四种翼型的捕能性能，结果表明采用仿生翼型的扑翼具有更好的捕能性能。进一步通过对不同外形扑翼的流场分析发现，采用仿生翼型可使扑翼在被动往复扑动过程中产生更强的涡流，并且在俯仰运动过程中可延缓涡流从扑翼表面脱落，从而使扑翼具有较好的捕能性能。

THE INFLUENCE OF BIONIC AIRFOIL ON POWER EXTRACTION PERFORMANCE OF SEMI-ACTIVE FLAPPING WING

In order to analyze the effect of airfoil bionic shape onthe power extraction performance of semi-active flapping wing,a set of computational programiscompiled so as to effectively solve the fluid flow,active rotation and passive reciprocating flapping of airfoil by means ofan improved fluent fluid solver.Based on this developed program,four types of airfoils:dragonfly airfoil,seagull airfoil,NACA0012 and NACA0015 are studied,and the results show that the airfoils with bionic shape have better power extraction performance.Further analysis forthe flow field of flapping airfoils with different shapes shows that bionic airfoils can generate stronger vortices in the process of passive reciprocating flapping,and that the vortex shedding from the flapping airfoil surface in pitching motion is delayed,which results in the airfoil to have better energy extraction characteristics.