基于等效电路和点电流源的潜艇水下腐蚀电场估算

Estimation of submarine underwater corrosion electric field based on equivalent circuit and point current source

为了对潜艇涂层破损状态的水下腐蚀电场进行快速评估,基于电化学腐蚀原理和潜艇结构特点,建立潜艇涂层局部破损时的腐蚀电流等效电路,对潜艇涂层局部破损时的腐蚀电流强度进行估算,并基于点电流源对潜艇腐蚀电场建模,将潜艇涂层破损部位和裸露螺旋桨等效为点电流源,利用点电流源在分层介质中的电场计算公式对潜艇涂层破损时的腐蚀稳恒电场进行估算。与潜艇腐蚀电场商业有限元软件COMSOL仿真结果对比表明:该估算方法得到的潜艇表面腐蚀电流和不同路径电场分布曲线规律与COMSOL仿真结果基本一致,电流估算值相对误差不超过6.5%,电场各分量峰峰值相对误差不超过18%。

In order to quickly evaluate the underwater corrosion electric field in the damaged state of the submarine coating,the corrosion current equivalent circuit of submarine coating local damage was established based on the principle of electrochemical corrosion and the characteristics of submarine structure,and the corrosion current intensity of submarine coating local damage was calculated.The corrosion electric field of submarine was modeled based on the point current source.The damaged part of submarine coating and exposed propeller were equivalent to point current source.The calculation formula of electric field of point current source in layered medium was used to estimate the corrosion stable electric field in the damaged state of the submarine coating.Compared with the simulation results of the commercial finite element software COMSOL for the corrosion electric field of a certain submarine,the results show that the submarine surface corrosion current and the electric field distribution curves of different paths obtained by this estimation method are basically consistent with the simulation results of COMSOL,the relative error of current calculation value does not exceed 6.5%,and the relative error of peak to peak value of each electric field component does not exceed 18%.