介质涂覆位置对二元塞式喷管的电磁散射特性影响

Electromagnetic Scattering Characteristics of Binary Plug Nozzle with Coating Medium at Different Part

关键词:  塞式喷管  雷达散射截面积  吸波材料  阻抗边界条件  迭代物理光学法

Key words:  Plug nozzle  Radar cross section  Absorbing material  Impedance boundary condition  Iterative physics optics method

摘要:

为研究雷达吸波材料对二元塞式喷管的雷达散射截面积（RCS）的缩减效果，采用阻抗边界条件的迭代物理光学（IPO）法，对基准模型和7种不同介质涂覆方案的二元塞式喷管进行了电磁散射特性数值模拟，指出了二元塞式喷管电磁散射的主要贡献源。结果表明：在中心锥和混合器涂覆吸波材料，对塞式喷管RCS缩减效果有限；中心锥与塞锥、混合器与塞锥的组合涂覆与塞锥单一涂覆的RCS均值相差不大；全涂覆模型具有最低的RCS均值；塞锥和出口壁面是二元塞式喷管电磁散射的主要来源，以偏航探测平面水平、垂直极化方式为例，对塞锥和出口壁面组合涂覆模型可分别达到全涂覆的75%和87%的RCS缩减效果。

Abstract:

To research the reduction effect of radar absorbing materials on the radar cross section（RCS） of binary plug nozzles， the iterative physical optics （IPO） method with impedance boundary conditions was used to simulate the electromagnetic scattering characteristics of binary plug nozzles with uncoated and seven different media coating solutions. The main contribution source of electromagnetic scattering of binary plug nozzles is pointed out. The results show that： coating the center cone and the mixer with the absorbing material has limited effect on the RCS reduction of the plug nozzle. The mean value of the RCS of the combined coating of “center cone-plug” and “mixer-plug” is similar to the single coating of the plug cone. The full-coated model has the lowest average RCS. The plug and the outlet wall are the main sources of electromagnetic scattering for the binary plug nozzle. Taking the horizontal and vertical polarization of the yaw detection plane as an example， the “plug and the outlet” combined wall coating model can achieve 73% and 87% RCS reduction effects of the full coating.