直升机尾桨参数对RCS影响分析

在执行战时任务时，对武装直升机的隐身性能提出了较高要求，为降低直升机在执行任务时被发现的概率，基于几何光学法和一致性绕射理论，研究直升机尾桨翼型厚度、弯度、剪刀角角度对RCS 的影响。选用两种照射雷达方位，通过对尾桨不同参数和涂敷吸波材料的RCS 峰值、均值对比，判断更有利于直升机尾桨隐身的条件。结果表明：雷达从地面照射时，尾桨厚度小、弯度小的RCS 会适当减小，剪刀角角度的变化会导致RCS 峰值相位变化；雷达平行照射时，厚度小的尾桨RCS 小，弯度小的RCS 峰值更小；在桨叶前缘与桨尖端面涂敷吸波材料可以有效降低桨叶整体RCS。选择尾桨的厚度越小、弯度越小，有利于降低直升机尾桨的RCS，对桨尖端面和桨叶前缘进行吸波材料涂敷可以有效降低整体RCS。

The influence of helicopter tail rotor parameters on RCS

To reduce the probability of helicopters being discovered during mission execution, based on the geometric optics method and consistent diffraction theory, the effects of different tail rotor airfoil thickness, curvature, and scissor angle of tail rotor on RCS were studied for the helicopter tail rotor. Using radar to irradiate the tail rotor from the ground and radar to irradiate the tail rotor from the rear of the helicopter, the RCS of the tail rotor is analyzed using two different irradiation radar orientations. By comparing the RCS peak and mean values of different parameters of the tail rotor, the more favorable conditions for the stealth of the helicopter tail rotor are determined. When illuminating the tail rotor from the ground, the RCS with small thickness and curvature of the tail rotor will be smaller, and changes in the angle of the scissors will cause changes in the peak phase of the RCS. When the radar illuminates the tail rotor from the rear, the RCS of the tail rotor with smaller thickness is smaller, while the RCS peak of the tail rotor with larger curvature is smaller. Based on comprehensive analysis, the smaller the thickness and curvature of the tail rotor, the more favorable it is to reduce the RCS of the helicopter tail rotor.