【作者】 闫林波； 何欣波； 王野； 冯浩南； 魏兵；

【Author】 YAN Linbo;HE Xinbo;WANG Ye;WEI Bing;School of Physics,Xidian University;Key Laboratory of Optoelectronic Information Perception in Complex Environments of the Ministry of Education;

【机构】 西安电子科技大学物理学院； 复杂环境光电信息感知教育部重点实验室；

【摘要】 水下航行体在航行过程中扰动周围海水而形成尾流,尾流中蕴含大量航行体信息,呈现出与周围海水相异的物理特性。为了探究水下航行体在运动时产生的尾迹的电磁特性,本文基于磁流体力学、麦克斯韦方程和流体力学基本理论,对水下航行体运动产生的尾迹电磁效应进行分析,得到了水下航行体尾迹电磁特性模型。采用COMSOL仿真软件,求解了静止状态下航行体附近的电磁场分布以及航行体运动时产生的尾流的电磁特性。结果表明:水下航行体尾流感应磁场的量级为10^-2～10² nT,感应电流密度的量级为10^-3～10^-1 A/m²,是海洋电磁探测不可忽视的电磁场源。水下航行体的磁异常特性在空间分布上有明显的特征,可以将尾流感应电磁场作为一种探测手段进行水下航行体的探测和追踪。更多还原

【Abstract】 The wake is formed by disturbing the surrounding seawater during navigation,and the wake contains a large amount of navigation body information,showing physical characteristics different from the surrounding seawater.To explore the electromagnetic characteristics of the wake generated by the motion of the underwater vehicle,this paper analyzes the electromagnetic effect of the wake caused by the motion of the underwater vehicle based on magnetohydrodynamics,Maxwell’s equation and the basic theory of fluid mechanics,and obtains the electromagnetic characteristics model of the wake of the underwater vehicle.The COMSOL was used to solve the electromagnetic field distribution near the vehicle at rest and the electromagnetic properties of the wake generated by the vehicle’s motion.The results show that the magnitude of the electromagnetic field at the tail of the underwater vehicle is 10^-2～10² nT,and the order of the induced current density is 10^-3～10^-1A/m²,which is a non-negligible source of electromagnetic field for marine electromagnetic detection.Its magnetic anomaly characteristics have obvious characteristics in spatial distribution,and the electromagnetic field can be used as a detection method to detect and track underwater vehicles.更多还原