半埋入式进气道设计及RCS数值仿真研究

Design and Numerical Simulation of RCS for Semi-submerged inlet

研究减小进气道的雷达散射截面问题,由于外形结构突出,造成强散射源。为提高隐身性能,用埋入式进气道构型,可以减少雷达散射面积。定义了埋入比m的概念,利用超椭圆设计方法,提出一种半埋入式进气道的设计方案,有效地提高了进气流量,同时具有较好的隐身性能。采用基于物理光学迭代法开发的程序,对不同埋入比下的模型进行了RCS数值仿真。结果表明,在计算角度范围内,RCS分布曲线都呈现类马鞍型,使进气道的RCS值最低。随着埋入比m的增大,进气道的RCS值都具有增大的趋势。仿真表明,改进方法效果好,具有较好的隐身性能。

The problem about how to reduce the radar cross section of inlet was studied. Because the inlet struc-ture is prominent, it becomes a strong scattered source. To improve the stealth performance, submerged inlet configu-ration can be designed to reduce the radar cross section. As buried-ratio is defined, a semi-submerged inlet was de-signed by using ultra-oval design method. It not only increases the inlet mass ratio effectively, but also has a good stealth performance. Using the program of iterative physical optics, the RCS of models with different buried-ratios was simulated. The results show that, in the range of calculation angles, RCS distribution is presented like saddle, and the RCS of the inlet reaches the lowest. With the increase of buried-ratio, RCS of the inlet has an increasing tendency. Simulation results show that the improved method is better and has a good stealth performance.