基于扭矩平衡的涵道风扇垂直起降无人机新概念设计

针对应用于短距／垂直起降飞机的涵道风扇升力系统进行了特性分析与应用研究，对涵道螺旋桨常规的动量一叶素理论计算模型进行了修正处理，建立了适用于总体设计阶段特性估算的计算模型。应用CFD技术对单独螺旋桨和涵道螺旋桨进行了不同流动状态下的特性计算，总结了其变化规律，并基于CFD滑流区诱导速度计算结果对前面建立的理论计算模型进行了二次修正。最后提出了一种基于扭矩平衡的涵道风扇垂直起降无人机新概念，在总体设计层面进行了参数分析与优化。

A New Concept Design of Ducted Fan VTOL Based on Torque Balance

This paper put the emphasis on the computation and analysis of the lift characteristics of the ducted fan S／VTOL aircraft. By applying the modified momentum-profile theory, the modified momentum-profile-theory model of ducted propeller is proposed which will be used in the concept design. CFD numerical simulation is carried out for a certain ducted tail rotor in different axial states, and some general rules of aerodynamics change of ducted propeller are obtained in the paper. A second correction is taken after analyzing the induced velocity distribution behind the propeller disk in the wake zone. A new concept of ducted fan based on Torque balance is proposed based on the research of ducted propeller. The initial optimization of the overall designing parameters is conducted in overall design level.