基于IPO的进气道扩压器电磁散射计算方法

进气道RCS目标特性在整个飞机中占有较大比例,但作为电大尺寸腔体,其RCS特性评估与外机身相比有其固有困难。本文研究了适合于任意腔体RCS评估的迭代物理光学算法,该方法基于磁场积分方程属于高频算法范畴,可以较精确地计算出进气道金属表面电流矢量分布并给出令人满意的RCS结果。通过软件开发实现了任意腔体RCS特性评估,并用标准算例考核了程序准确性。应用该软件对某型心线一定的金属进气道S弯扩压器开展计算研究,获得了不同宽高比扩压器在入射波长为0.03 m下的电磁散射特性变化规律。

Electromagnetic Scattering Calculation Method for Inlet Diffuser Based on IPO

The RCS target characteristic of inlet has a high percentage in aircraft RCS.However,as inlet is an electrically large cavity,it is inherently difficult to compute its RCS in contrast with that of fuselage.An iterative physical optics (IPO) algorithm for cavity RCS evaluation is investigated based on magnetic field integral equation,subjected to the high frequency algorithm category.IPO can calculate current vector on the metal surface of the inlet more exactly and achieve fairly accurate RCS.Any cavity RCS characteristics can be evaluated applying the software whose accuracy is proved by the standard example.The electromagnetic scattering variation rules of the different width-height ratio diffusers under the incident wave(0.03 m) are obtained by using the software to carry out the calculation of the inlet S-shaped metal diffusers with the same certain line.