CAJ | 학술논문

为研究船舶冷却水管路流动冲蚀失效过程，明晰冷却水管路易发生腐蚀破损的薄弱部位，建立船舶冷却水系统管路数理模型，采用基于CFD数值模拟的方法研究冷却水管路系统压力场和流速场运行特性，结合引发流动冷却水冲蚀管道的机理，得到弯头、三通管等易损部位的流速、湍动能、剪切应力和压力的参数分布。分析冷却水管路内流场，判定三通管流出支管易遭受冲击腐蚀和冲刷腐蚀，三通管焊缝区域易遭受空泡腐蚀，弯管中游靠内壁区域受冲击腐蚀、冲刷腐蚀和空泡腐蚀。
위연구선박냉각수관로류동충식실효과정，명석냉각수관로역발생부식파손적박약부위，건립선박냉각수계통관로수리모형，채용기우CFD수치모의적방법연구냉각수관로계통압력장화류속장운행특성，결합인발류동냉각수충식관도적궤리，득도만두、삼통관등역손부위적류속、단동능、전절응력화압력적삼수분포。분석냉각수관로내류장，판정삼통관류출지관역조수충격부식화충쇄부식，삼통관한봉구역역조수공포부식，만관중유고내벽구역수충격부식、충쇄부식화공포부식。
For the study of ship cooling water flow erosion failure process, weak position coming from corrosion damages for cooling water pipe were cleared.The mathematical and physical models of ship cooling water pipeline are established.The opera-tion characteristics with pressure and velocity field for the cooling water pipeline are analyzed by using CFD simulation.Three mechanisms comprised impingement corrosion, brush corrosion and cavitation erosion, which could induce pipeline erosion by flowing cooling water are inserted.The key predicting parameter such as local velocity, turbulence kinetic energy, wall shears and pressure around T-junction and elbow regions are obtained.Based on the analysis of flow field within the cooling water pipe-line, the calculated results indicated that impingement corrosion and brush corrosion are easy to come up.Cavitation erosion is easy to take place at the region of weld joint for T-junction.All of impingement corrosion, brush corrosion and cavitation erosion can happen midstream elbow rely on inner wall region.