冰晶对极地船海水冷却管路两相流换热规律的影响

摘要

According to the computational fluid dynamics ( CFD) method, the formation of ice jams is prevented by the opti-mal average operating ice packing factor ( IPF) control range in the tube of the seawater cooling system for a 14 500 t bulk carri-er .The numerical simulation on the flow characteristics of the seawater-ice crystals two-phase in the part level tube of the seawa-ter cooling system is carried out to reveal the velocity and average Nusselt number distribution in the piping system , and the aver-age range is obtained that there is no occurrence of ice jams .CFD simulation results show that ice jams is caused because IPF is more than 7%.The reliability of the method is validated by comparing the simulation value with the reference one .It is found that the optimum average IPF range does exist in the seawater cooling pipe , and that is 2%~6%.%针对极地运输船海水冷却管路不同含冰率情况下冰塞形成问题，运用计算流体力学（ CFD）数值模拟方法，计算分析14500 t散货船部分水平海水冷却管路两相流流动特征，揭示管内冰晶运动速度分布与平均努塞尔数大小变化及管内是否存在不发生冰塞的平均含冰率区间。仿真结果表明，冷却管路平均含冰率超过7％会造成管内冰塞。与以往实验数据对比说明，极地航行时该散货船海水冷却管路确实存在最优含冰率区间，其最优平均含冰率控制区间为2％～6％。