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 semiactive 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.