项目名称: 再入飞行体等离子体尾迹流场电磁散射特性研究
项目编号: No.61261006
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 无线电电子学、电信技术
项目作者: 刘崧
作者单位: 南昌大学
项目金额: 43万元
中文摘要: 再入飞行体伴生的等离子体尾迹流场所导致的通讯中断现象是世界各国航天技术亟待解决的重要课题。本申请项目致力于再入飞行体等离子体尾迹流场数值算法的优化及其电磁散射特性研究,主要研究内容包括基于图形处理器的复杂目标电磁散射加速时域有限差分算法、高精度的高阶龙格库塔指数时程时域有限差分算法的研究;构建球体和钝锥体两种典型的再入飞行体伴生的等离子体尾迹流场模型,根据流体力学和电动力学的耦合方程组,利用创新的时域有限差分算法对电磁波在两种典型模型中的传播特性及其雷达散射特性进行数值模拟,讨论电磁波在等离子体尾流场中的传播特性与等离子体压强、密度等参数的关系;分析等离子体尾迹流场外形变化、外磁场、飞行高度、马赫数以及入射电磁波频率等参量对再入目标雷达散射截面的影响。本课题研究目的是建立适用于再入体尾迹流场的高效、稳定的数值方法,提高基础理论研究水平,为进一步掌控再入过程中通信中断,提供一定理论依据。
中文关键词: 等离子体流场;再入飞行体;时域有限差分方法;电磁散射;
英文摘要: The interruption of communication resulted from the plasma wake flow of reentry vehicles has become an important subject to be settled urgently in astronautic project in all countries. This topic is mainly devoted to analysis of the electromagnetic scattering characteristics for the plasma wake flow of reentry vehicles, which includes the study of accelerated FDTD methods based on Graphic Processing Units (GPU) and the Runge-Kutta Exponential Time Differencing (RKETD) FDTD for complex targets; with the help of the fluid mechanics equations and the electrodynamics equations, numerically investigates the electromagnetic scattering characteristics for the sphere and the blunted cone, and the relation of the electromagnetic wave propagation characteristics in the plasma wake flow of reentry vehicles, and the plasma pressure and the plasma density; and evaluates how the change of the shape of the plasma wake flow, applied magnetic field, altitude, Mach number and incidence wave frequency et al. exert influences on the Radar Cross Sections. The intention of the subject is to establish a high-precision numerical algorithm suitable for the plasma wake flow of reentry vehicles, and improve the research level of basic theory, and hope to provide a little positive theory reference for solving the problem of interruption of
英文关键词: plasma flow fields; reentry vehicles;FDTD;electromagnetic scattering;