基于CFD方法的主动襟翼控制旋翼翼型涡特性研究

基于计算流体力学(Computational fluid dynamics,CFD)技术,建立了一个适用于旋翼二维主动襟翼控制(Active flap control,AFC)数值模拟的方法。在满足对翼型参数化分析的前提下,使用Euler方程求解以提高计算速度,并采用嵌套网格方法对AFC旋翼后缘襟翼进行运动控制。应用所建立的方法,首先进行了算例验证计算,然后着重对AFC旋翼翼型进行了数值模拟。在此基础上,进一步开展了AFC旋翼翼型主要参数对后缘涡影响的计算分析。结果表明:提高桨尖马赫数、增加后缘小翼摆动频率能加快涡产生速度;而提高桨尖马赫数、增大后缘小翼摆动幅度和后缘小翼长度能增大涡的强度;但增大后缘小翼与主桨叶缝隙间距仅在一定范围内能够增加涡强度。

Study of AFC Rotor Airfoil Vortex Characteristics Based on CFD Method

A numerical simulation method for rotor active flap control (AFC) is proposed based on the computational fluid dynamics(CFD) technology. The Euler equation is used to increase the computational speed when the parameterized analysis of airfoil characteristics is satisfied. The motion of the trailing edge flap of the AFC rotor is controlled by the moving overlapped grid method. Firstly, numerical examples are given to verify the results. Then, the numerical simulation of the AFC rotor airfoil is carried out. Finally, the influence of the main parameters of the AFC rotor airfoil on the blade vortex is also discussed. Results show that the vortex generation rate increases with the increasing of tip Mach number and trailing edge oscillation frequency. The strength of vortex increases with the increasing of tip Mach number, trailing edge swing, and trailing edge chord length. However, increasing the distance between the trailing edge and the main blade gap can increase vortex strength only in a certain range.