航空学报 > 2007, Vol. 28 Issue (6): 1296-1301

蛇形进气道的电磁散射特性

石磊,郭荣伟   

  1. 南京航空航天大学 能源与动力学院
  • 收稿日期:2006-09-29 修回日期:2007-06-18 出版日期:2007-12-15 发布日期:2007-12-15
  • 通讯作者: 石磊

Electromagnetic Scattering Characteristics of Serpentine Inlet

Shi Lei,Guo Rongwei   

  1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics
  • Received:2006-09-29 Revised:2007-06-18 Online:2007-12-15 Published:2007-12-15
  • Contact: Shi Lei

摘要:

对一种进口与机身保形设计的蛇形进气道在Ku波段选择入射频率15 GHz情况下进行了电磁散射特性的实验和仿真研究,取得了蛇形进气道雷达散射截面(RCS)随方位角、迎角和终端的变化规律。研究结果表明: (1)该蛇形进气道在水平极化终端为风扇时±60° RCS均值为-24.33 dB·m2,垂直极化为-19.15 dB·m2,是一种低RCS进气道;(2)运用时域有限差分法计算所得的RCS随方位角变化曲线与实验曲线趋势基本一致,±60°均值误差在4 dB以内;(3)从进气道对称面电场(Ex)分布图可以看出入射波射入进气道并在内壁面产生多次反射,从而验证了蛇形进气道的设计思想并为在内通道关键反射点涂敷吸波材料实现蛇形进气道的高隐身提供了一个可行的研究平台。

关键词: 航空航天推进系统, 蛇形进气道, 电磁散射, 隐身技术

Abstract:

This paper presents a study of the electromagnetic scattering of a serpentine inlet at 15 GHz in Ku wave band. The radar cross section (RCS) characters of the serpentine inlet at different azimuths, attack angles and terminators are obtained. The results indicate that: (1) The average RCSs of the serpentine inlet with fan terminator in ±60°azimuth are-24.33 dB·m2in horizontal polarization and-19.15 dB·m2 in vertical polarization. It means that the serpentine inlet is a low observable inlet.

Key words: aerospace , propulsion , system,  , serpentine , inlet,  , electromagnetic , scattering,  , stealth , technique

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