电磁波在固体火箭尾焰中的折射轨迹研究

Study on the Refraction Trajectory of Electromagnetic Wave in the Solid Rocket Exhaust Plume

为了获得电磁波在穿过尾焰时的折射偏转轨迹,以CFD计算的某型固体火箭尾焰流场为基础,建立了尾焰等离子体折射率模型,考虑尾焰同时在轴向和径向两个方向离散,对电磁波在尾焰中的折射偏转轨迹进行了计算。对比分析了不同电磁波频率,不同入射位置,不同入射角度下电磁波折射偏转轨迹的区别,掌握了电磁波在尾焰中的折射偏转特性。研究结果表明,尾焰等离子体折射率与入射电磁波频率相关,对应不同入射电磁波频率,尾焰折射率云图分布呈现不规则性;即使入射位置及入射角度确定,电磁波频率与折射情况也没有严格的定性关系,但是随着电磁波频率的增加,尾焰对电磁波的折射干扰程度有减小的趋势。

To obtain the refractive deflection trajectory of electromagnetic wave passing through the exhaust plume,based on the CFD calculation of a certain type of solid rocket exhaust plume flow field,the refractive index model of exhaust plume plasma was established.The calculation of the refractive deflection trajectory of electromagnetic wave in the plume was carried out by considering the discretizing exhaust plume in both axial and radial directions.The differences of refraction deflection trajectories under different frequencies,different incident positions and different incident angles were compared and analyzed,and the refractive deflection characteristics of electromagnetic wave in exhaust plume were obtained.The results show that the refractive index of the exhaust plume is related to the frequency of the incident electromagnetic wave.The distribution of the refractive index of the exhaust plume is irregular according to the frequency of electromagnetic wave.Therefore,there is no strict qualitative relationship between electromagnetic wave frequency and refraction,even if the incident position and the incident angle are determined.But as the frequency of the electromagnetic wave increases,the degree of interference of the exhaust plume on the electromagnetic wave has a tendency to decrease.