海浪背景下舰船尾流感应磁场特性  

Characteristics of ship s wake induction magnetic field under background of waves

作　　者：魏宝君 陈涛 刘健 李静 WEI Baojun;CHEN Tao;LIU Jian;LI Jing(College of Science in China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)理学院,山东青岛266580

出　　处：《中国石油大学学报（自然科学版）》2024年第1期104-114,共11页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重点研发计划项目(2019YFC1408104);中央高校基本科研业务费专项(20CX05013A)。

摘　　要：基于麦克斯韦方程组以及海浪和尾流的速度场表达式得到无限深海水中海浪背景下舰船尾流感应电磁场的表达式,根据分界面处感应电磁场的连续性条件确定表达式中的待定系数。利用所得到的表达式分析无限深海水中尾流感应磁场、海浪感应磁场和海浪背景下舰船尾流感应磁场的特性。结果表明:舰船尾流感应磁场各分量的幅度在靠近海面的海水中均存在极大值点,且这些极大值点的数值和对应的海水深度均随船速的增大而增加;在海水中某一深度处舰船尾流感应磁场主要集中分布在一个“V”形平面区域内,且船速越大,“V”形区域内感应磁场周期性振荡的幅度越大,沿尾流运动方向振荡的空间间隔越大;海浪对舰船尾流感应磁场z分量的影响大于对x分量的影响。风向对尾流感应磁场的影响存在周期为π的周期性;当风速小于船速时,海浪对舰船尾流感应磁场的影响较弱,在“V”形区域内尾流感应磁场占主导作用;当风速继续增加时,海水中海浪感应磁场的强度显著增大,对尾流感应磁场的影响明显增强,在“V”形区域内尾流感应磁场逐渐被海浪感应磁场所覆盖;与风速变化所产生的影响差异比较明显相比,风向变化对尾流感应磁场影响的差别相对要小。The expression detailing the ship s wake-induced electromagnetic field in the presence of waves within infinite deep sea water was obtained based on Maxwell s equations and the velocity field expressions of waves and wakes.The coefficients within the derived expression were determined by ensuring the continuity condition of induced electromagnetic fields at the interface.The obtained expressions were then employed to analyze the distinct characteristics of the ship s wake-induced magnetic field,the wave s induction magnetic field and the ship s wake-induced magnetic field in the presence of waves.The findings revealed that the amplitude of each component of the ship s wake-inducted magnetic field reaches the peak value near the sea surface,and both the peak value and the corresponding sea depth increase with the ship s speed.The ship s wake-induced magnetic field is mainly distributed over a"V"shaped plane area at a certain depth in the seawater.Higher ship speeds correlate with the increased amplitude of the periodic vibration of the induced magnetic field,and larger spatial interval of the vibration along the direction of the ship s wake movement within the"V"shaped area.The influence of waves on the z-component of the ship s wake-induced magnetic field is greater than that on the x-component.The influence of wind direction on the ship s wake-induced magnetic field is periodic with a period ofπ.When the wind speed is smaller than the ship speed,the influence of waves on the ship s wake-induced magnetic field is weak,and the wake-induced magnetic field plays a dominant role in the"V"shaped area.When the wind speed increases continuously,the strength of the wave s induction magnetic field in the seawater increases significantly and its influence on the ship s wake induced magnetic field is significantly enhanced,and the ship s wake-induced magnetic field is gradually covered by the wave s induction magnetic field in the"V"shaped area.Compared to the more pronounced influence caused by changes in wind speed,the i

关 键 词：舰船尾流 海浪 感应磁场 三维海水运动 

分 类 号：P631.9[天文地球—地质矿产勘探]