飞翼布局无人机气动/隐身综合性能分析

Analysis on aerodynamic/stealth synthetical performance of flying wing UAV

为了分析飞翼布局无人机气动/隐身综合性能,将KD树结构的基本思想与射线跟踪法结合,计算了X-45C,X-47A,X-47B三种飞翼式无人机RCS;将CFD技术与逆向蒙特卡洛方法相结合,计算了无人机蒙皮红外辐射强度;基于灰色系统理论,运用灰关联度模型建立了无人机雷达隐身-红外隐身-气动性能综合性能评判方法。结果表明:X-45C气动/隐身总体性能最好;X-47B由于外翼段的存在,保证其低速状态下的高升阻比特性以及较优的气动特性;低马赫数大迎角飞行时,X-47B的气动性能是最好的。

In order to analyze the aerodynamic/stealth performance of the flying wing UAV,combining the basic idea of the KD tree method and ray tracing method,the RCS of three flying wing UAVs（ X-45 C,X-47 A,X-47 B） are computed. Combining computational fluid dynamics technology and reverse Monte Carlo method,the IR strength of the three flying wing UAVs are computed. Based on the grey system theory,comprehensive evaluation method for radar stealth,infrared stealth and aerodynamic performance of UAV is established with the grey correlation model. Analysis results show that the X-45 C has the best aerodynamic/stealth performance. The outer wing of X-47 B ensures the high lift-drag-ratio and relatively excellent aerodynamic under low velocity. X-47 B has the best aerodynamic when flying at low Mach number and large AOA.