流速和弯曲角度对弯头腐蚀行为影响仿真研究  

Simulation Study on Influence of Flow Velocity and Bending Angle onCorrosion Behavior of Elbow

作　　者：郑斐 邢少华[2] 何华 高荣杰[1] 许立坤[2] ZHENG Fei;XING Shao-hua;HE Hua;GAO Rong-jie;XU Li-kun(Ocean University of China,Qingdao 266100,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang ship Material Research Institute,Qingdao 266237,China;Dalian Shipbuilding Industry Group Engineering and Research Institute Co.,Ltd,Dalian 116000,China)

机构地区：[1]中国海洋大学,山东青岛266100 [2]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室,山东青岛266237 [3]大连船舶重工集团设计研究院有限公司,辽宁大连116000

出　　处：《装备环境工程》2020年第6期18-23,共6页Equipment Environmental Engineering

摘　　要：目的研究不同弯度的铜镍合金管道在海水冲刷下的腐蚀规律,为弯头腐蚀控制奠定基础。方法以铜镍合金在海水中的极化曲线作为边界条件,通过k-ε湍流模型模拟30°、45°和90°三种弯头在不同流速下的腐蚀行为。结果流体进入弯头后,内侧流速明显加快,外侧流速减小,导致内管壁腐蚀严重。内侧局部强腐蚀区随弯曲角度的增大而后移,相应的腐蚀速率也会增加。同时,随着入口流速的增加,弯头管壁的腐蚀速率会加快,但不改变弯头内的最大腐蚀部位。结论弯头腐蚀速率与流速、弯曲角度密切相关。流速越高,弯曲角度越大,管壁的腐蚀速率越大。The paper aims to study the corrosion law of copper-nickel alloy pipes with different curvature under seawater scouring, to lay a foundation for elbow corrosion control. The corrosion behavior of three elbows of 30°, 45° and 90° at different flow rates was simulated by the k-ε turbulence model using polarization curves of copper-nickel alloy as boundary conditions. After the fluid entered the elbow, the flow velocity of inner side was obviously accelerated, and that of outer side was reduced, resulting in serious corrosion of the inner pipe wall. The corresponding corrosion rate increased with the increase of the bending angle;and at the same time, the serious corrosion zone moved backward. Meanwhile, as the inlet flow rate increased, the corro- sion rate of the elbow wall was increased, but the maximum corrosion location within the elbow was not changed. The elbow corrosion rate is closely related to the flow rate and bending angle. The higher the flow rate and the greater the bending angle, the greater the corrosion rate of the tube wall.

关 键 词：弯头 腐蚀 弯曲角度 流速 

分 类 号：TG172.5[金属学及工艺—金属表面处理]