摘要
采用CFD数值方法,研究了NACA0012翼型、加装传统Gurney襟翼及改进不对称Gurney襟翼后翼型的动态失速特性。给出了传统襟翼对翼型动态失速特性的影响,并带来较大动态低头力矩的不足,基于传统襟翼的不足,提出了改进的不对称Gurney襟翼方案。研究表明,不对称Gurney襟翼可较好改善翼型的动态失速特性,在增加动态升力的同时,俯仰低头力矩明显减小,可能是直升机旋翼的较理想翼型。
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.
出处
《飞行力学》
CSCD
北大核心
2010年第4期5-8,共4页
Flight Dynamics
