大宽高比S形二元喷管电磁散射特性研究

Investigation on radar cross-section of S-shaped 2-D nozzles with large width-height ratio

基于研究大宽高比对S形二元喷管的电磁散射特性的影响的目的.在S形二元喷管进出口面积、偏心距、面积变化规律及中心线变化规律不变的条件下，采用自适应超椭圆方法设计了出口宽高比为4.5-8.0的S形二元喷管.采用等效边缘电磁流法与迭代物理光学法分别分析了8种S形二元收敛喷管的出口边缘绕射场及总散射场的电磁散射特性.研究结果表明：在水平、垂直两种极化方式下，喷管出口宽高比的变化对S形二元收敛喷管边缘绕射场的RCS影响较小.喷管出口宽高比的变化对总散射场的RCS影响较大；在水平极化下，宽高比为5.

Based on the purpose of the influence of the large width-height ratio on the S shaped nozzles electricity scattering characteristics. Keeping the outlet area、eccentricity、area regularity and center line regularity, the adaptive super-ellipse method was adopted to design several S shaped 2D nozzles with different width height ratio from 4.5 to 8.0. Based on Iterative Physical Optics Algorithm and equivalent edge currents （EEC）, The electricity scattering characteristics of outlet edge diffraction field and total scattering field of 8 different S shaped 2D nozzles under horizontal or vertical polarization mode was analyzed. The result indicates that under horizontal or vertical polarization mode the width height ratio of outlet have less effect on the RCS of nozzle edge diffraction field and have large influence on total scattering field. The width height ratio influence the detection probabilities. Under horizontal polarization way, in the large range of the detection angle the total scattering filed has lower RCS while the width-height ratio is 5.5.