Research on Distribution Characteristics of Induced Electromagnetic Field in Undersea Vehicle Wake
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摘要: 水下航行器尾流切割地磁场产生的感应电磁场为其非声学探测提供了新途径。然而, 现有研究多集中于水面舰船或有限水深环境, 且未能深入揭示下潜深度在无限深水域中对尾流电磁场的调控规律。针对此问题, 文中基于麦克斯韦方程组和流体力学基本理论, 利用水下航行器尾流感应电磁场的数学模型进行数值仿真, 并重点对比分析了下潜10 m与50 m 2种典型深度下的场分布特征。结果表明: 当水下航行器运动时, 其尾流速度场分布呈典型V字形分布, 尾流感应电磁场沿航迹呈指数衰减; 随着下潜深度增加, 感应磁场峰值显著减弱(从0.3 nT降至0.1 nT), 感应电场峰值增强(从1 μV/m增至3 μV/m)。文中研究从理论与仿真层面揭示了下潜深度对电磁场的影响规律, 证实了针对不同潜深目标需采用差异化探测策略的可行性, 为深海目标探测提供了新的理论依据。Abstract: The induced electromagnetic field generated by the undersea vehicle wake cutting through the geomagnetic field provides a new approach for the non-acoustic detection. However, existing research has primarily focused on surface ships or environments with finite water depth and has not thoroughly revealed the influence law of submersion depth on the wake’s electromagnetic field in infinitely deep waters. To address this issue, this study employed numerical simulations based on Maxwell’s equations and fundamental hydrodynamic theories, utilizing a mathematical model of the induced electromagnetic field in the undersea vehicle wake. The distribution characteristics of the field at two typical depths, namely 10 m and 50 m, were specifically compared and analyzed. The results indicate that when the underwater vehicle is sailing, its wake velocity field exhibits a typical V-shaped distribution. The induced electromagnetic field of the wake decays exponentially along the trajectory. As the submersion depth increases, the peak induced magnetic field strength significantly decreases (from 0.3 nT to 0.1 nT), while the peak induced electric field strength increases(from 1 μV/m to 3 μV/m). This study elucidates the influence of submersion depth on the electromagnetic field through theory and simulation, confirms the feasibility of adopting differentiated detection strategies for targets at different depths, and provides a new theoretical basis for deep-sea target detection.
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图 1 水下航行器运动环境示意图
Figure 1. Schematic diagram of the motion environment for underwater vehicle
图 2 水下航行器尾流速度场分布情况
Figure 2. Distribution of velocity field in the wake of underwater vehicle
图 3 水下航行器尾流感应磁场强度分布
Figure 3. Distribution of induced magnetic field intensity in the wake of underwater vehicle
图 4 水下航行器尾流感应电场强度分布
Figure 4. Distribution of induced electric field intensity in the wake of underwater vehicle
表 1 仿真参数设置
Table 1. Simulation parameters
参数 数值 航行器长度/m 100 航行器速度/(m/s) 10 航行器模型半径/m 20 海水电导率/(S/m) 5 地磁恒定强度/nT 50 000 γ/(°) 0 I/(°) 60 
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