带前缘小翼的扇翼翼型气动特性数值模拟分析

扇翼升力和推力的产生主要依靠翼型前缘弧形槽上方低压涡的形成，使得升力和推力具有较强的耦合关系，如何对其解耦控制是扇翼进一步工程应用的关键。对于扇翼翼型各项几何参数确定的情况下，前缘开口角的大小对扇翼气动性能的影响最大。因此考虑在基准扇翼翼型的前缘安装前缘小翼的方法来改变扇翼前缘开口角的大小，通过数值模拟的方法，对比分析了单片、双片和三片前缘小翼在不同前缘小翼偏转角、来流速度、迎角下对扇翼升力和推力的影响规律。结果表明:通过对前缘小翼偏转角的角度控制不仅仅可以改善扇翼的升力和推力，还可对低压涡的强度和位置进行控制，满足对扇翼气动力的主动控制要求，因而可实现对扇翼飞行器姿态进行操控的目的。 

Numerical simulation and analysis of aerodynamic characteristics of fan-wing airfoil with leading edge winglet

The generation of lift and thrust mainly depends on the formation of low-pressure vortices above the arc groove on the leading edge of the fan-wing, which makes the lift and thrust have a strong coupling relationship. How to decouple and control the lift and thrust is the key to the further engineering application of the fan-wing. When the geometric parameters of the fan-wing airfoil are determined, the leading edge opening angle has the greatest influence on the aerodynamic performance. Therefore, the method of installing leading edge winglets on the leading edge of a base fan-wing airfoil was considered to change the opening angle of the leading edge. By means of numerical simulation, the effects of single, double and three leading-edge winglets on lift and thrust of the fan at different installation angles, inflow velocities and angles of attack are compared and analyzed. The results show that the angle control of the leading edge winglet installation angle can not only improve the lift and thrust of the fan-wing, but also control the strength and position of the low-pressure vortices to meet the requirements of active control of the aerodynamic force of the fan-wing, so the attitude control of the fan-wing aircraft can be realized.