直升机尾桨参数对RCS影响分析

The influence of helicopter tail rotor parameters on RCS

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。选用两种雷达照射方位,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。因此,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。

High requirements have been placed on the stealth performance of armed helicopters during wartime mis⁃sions,in order to reduce the probability of the helicopter being found during the task,based on geometric optics method and consistent diffraction theory,the effects of different tail rotor profile thickness,curvature and tail rotor scissors angle on RCS are studied.By comparing different parameters of the tail rotor and the RCS peak value and mean value of the coated absorbing material,the conditions which are more favorable to the stealth of the helicopter tail rotor are determined.When viewed from the ground,the RCS with small tail rotor thickness and small curva⁃ture will be reduced appropriately,and the change of scissors angle will lead to the change of RCS peak phase.When the radar is irradiated in parallel,the RCS of tail rotor with smaller thickness is smaller,and the RCS peak value of tail rotor with smaller curvature is smaller.Applying wave absorbing materials on the leading edge and tip of the blade can effectively reduce the overall RCS of the blade.Comprehensive analysis shows that by using the smaller thickness and curvature of the tail rotor,it is beneficial to reduce the RCS of the helicopter tail rotor,and the blade tip surface and the blade leading edge of the absorbing material coating can effectively reduce the overall RCS.