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Analysis of Electromagnetic Scattering Characteristics for a HTV-2 Type Flight Vehicle Ablation Flows

机译:HTV-2型飞行车辆消融流动电磁散射特性分析

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This paper describes the methodology for computing hypersonic flight vehicle electromagnetic scattering characteristics under condition of thermochemical nonequilibrium ablation flow using Maxwell Equations and Navier-Stokes Equations. Some previous work has been report by Bhaskar et al. (2005) for calculating microwave scattering from metallic objects shielded by a plasma shroud and by Chen et al. (2005) for predicting charring material ablation and shape change on hypersonic reentry vehicles. For obtaining the flow field parameters especially thermochemical nonequilibrium ablation flow components, 13 species 34 reactions chemical reaction model and heat conduction model were utilized for flow field and structure temperature field simulation respectively. In consideration of rarefied effect, Slip boundary condition was also used in the process of solving N-S Equations. Based on the flow field results, a piecewise linear current density recursive convolution finite-difference time-domain (PLJERC-FDTD) algorithm was applied to calculate backward Radar Cross-Section (RCS) and bistatic RCS in P&L-band. Through above methods, the electromagnetic scattering characteristics of a HTV-2 type vehicle wrapped in carbon based material were studied.
机译:本文介绍了使用Maxwell方程和Navier-Stokes方程计算热化学非预测消融流动条件下计算过高速飞行车辆电磁散射特性的方法。 Bhaskar et al的一些以前的工作报告。 (2005)用于计算由等离子护罩和Chen等人屏蔽的金属物体散射的微波散射。 (2005)用于预测高效再入车辆的炭化材料消融和形状变化。为了获得流场参数,特别是热化学非预测烧蚀流动分量,分别用于流场和结构温度场模拟的13种44反应化学反应模型和导热模型。考虑到稀土效应,在求解N-S方程的过程中也使用滑动边界条件。基于流场结果,应用了分段线性电流密度递归卷积有限差分时域(PLJERC-FDTD)算法来计算P&L波段中的反向雷达横截面(RCS)和双孔RC。通过上述方法,研究了以碳基材料包裹的HTV-2型载体的电磁散射特性。

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