Investigation of Gurney flap on improving dynamic stall aerodynamic characteristics of an airfoil

In this paper,numerical simulations by CFD methods have been performed to investigate into the dynamic aerodynamic characteristics of the NACA0012 airfoil with the traditional and unsymmetrical Gurney flap.The effect on dynamic stall aerodynamic characteristics of an airfoil with the traditional Gurney flap is presented.At the same time the shortage of the traditional Gurney flap on improving the dynamic stall aerodynamic characteristics of an airfoil is pointed out,and then a mended unsymmetrical Gurney flap scheme is provided.The primary research into dynamic stall characteristics of the unsymmetrical Gurney flap is implemented.The conclusion indicates that the unsymmetrical Gurney flap can improve dynamic stall characteristics of an airfoil better than the traditional Gurney flap.The unsymmetrical Gurney flap can decrease the pitching downward moment at the time of increasing the dynamic lift.The airfoil with unsymmetrical Gurney flap may be the perfect rotor airfoil of helicopters.