摘要
冲刷腐蚀是船舶管路损伤失效的重要原因,而管道内介质的流动速度是影响冲刷腐蚀速率的关键因素。基于数值模拟方法,对90°弯管不同位置的液相介质速度分量进行了计算与分析,发现管道冲刷腐蚀速率并非由介质流动合速度决定,而是由与管道轴向垂直的横截面内的速度分量(Dean涡强度)决定。横截面内的Dean涡强度越大,介质与壁面金属基材之间的传质过程越快,越容易导致管道冲刷腐蚀加速。
Erosive corrosion is an important cause of damage and failure of ship pipelines,and the flow velocity of the medium in the pipeline is a key factor affecting the rate of erosive corrosion.Based on numerical simulation method,the velocity components of the liquid medium at different positions of the 90°elbow pipe are calculated and analyzed,and it is found that the erosive corrosion rate of the pipeline is not determined by the combined velocity of the medium flow,but determined by velocity component(i.e.the Dean vortex strength)in the cross section perpendicular to the axial direction of the pipeline.The greater the Dean vortex strength in the cross section,the faster the mass transfer process between the medium and the metal substrate on the wall,and the easier to accelerate the erosive corrosion of the pipeline.
作者
吕文超
陈培红
徐亮
LV Wen-chao;CHEN Pei-hong;XU Liang(School of Marine Engineering,Jiangsu Shipping College,Nantong 226010,China)
出处
《江苏航运职业技术学院学报》
2022年第1期53-58,共6页
Journal of Jiangsu Shipping College
基金
江苏省高校自然科学基金项目(21KJD470001)
南通市基础研发项目(JCZ21003)。
关键词
冲刷腐蚀
弯管
Dean涡
数值计算
erosive corrosion
elbow pipe
Dean vortex
numerical calculation