外加电磁窗减缓再入飞行器的通信中断  

Blackout mitigation by electromagnetic control in re-entry vehicles

作　　者：杨鹰 于哲峰[1] 董维中[1] 丁明松[1] 孙良奎[1] 黄洁[1] Yang Ying;Yu Zhefeng;Dong Weizhong;Ding Mingsong;Sun Liangkui;Huang Jie(China Aerodynamics Research and Development Center,Mianyang621000,China)

机构地区：[1]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《强激光与粒子束》2018年第12期58-62,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(109020120;11272336);国家重点基础研究发展计划项目(2014CB3402)

摘　　要：为解决再入过程中的黑障问题,在前期磁窗天线增强等离子体透波特性研究基础上,开展了外加电磁窗影响研究,磁体为钕铁硼,外加电压为100V。利用不同飞行高度下的流场数据,对不加电磁场、外加磁场和外加正交电场与磁场影响下的流场进行数值模拟,对比不同参数设置下天线窗口处的电子密度和电磁波衰减常数,分析了再入飞行器的飞行高度、天线窗位置、电磁波频率、电子密度和碰撞频率等参数对电磁窗天线性能的影响。从分析结果可以看出,外加正交电场与磁场对于减缓再入过程中黑障的效果优于仅外加磁场,通过合理选择电磁窗的工作状态和参数可以改变等离子体的分布特性和介电参数,能够有效地增强电磁波在等离子体鞘套中的传输,为解决和减缓通信中断问题提供了一种可能的途径。In order to solve the re-entry blackout problem,based on the former research on magneto window antenna for improving propagation characteristic of electromagnetic wave in plasma sheath,the influence of external electromagnetic control is investigated,the magnet is NdFeB,and the applied voltage is100V.Numerical simulation of the flow fields without electromagnetic field,with magnetic field,with electromagnetic field are conducted by using flow field data of different flight altitude.Based on the simulation result,comparison of electronic density and attenuation constant nearby the antenna window with different parameters is shown,and the effects of aircraft flight altitude,the position of electromagnetic window antenna,electromagnetic frequency,the applied voltage electronic density and collision frequency on the electromagnetic window antenna are investigated.The results show that it is feasible to improve electromagnetic propagation in plasma sheath by electromagnetic window antenna,which has better results than magnetic window antenna.With proper working condition of electromagnetic window antenna and appropriate parameters setting,the propagation attenuation would be mitigated obviously by changing the dielectric parameters and the distribution of plasma,thus the phenomena of blackout would be mitigated or eliminated.

关 键 词：电磁窗 传输特性 黑障 再入过程 通信中断 

分 类 号：V211.1[航空宇航科学与技术—航空宇航推进理论与工程] V243.1