倾斜角度对管内液氮流动阻力系数的影响  

Effect of changing the tilt on the friction coefficient of liquid nitrogen flowing in pipes

作　　者：喻志广[1] 闫畅迪 黄永华[2] 

机构地区：[1]上海电缆研究所,上海200093 [2]上海交通大学制冷与低温工程研究所,上海200240

出　　处：《低温与超导》2016年第10期20-25,48,共7页Cryogenics and Superconductivity

摘　　要：高温超导电缆大都采用带真空多层绝热保护的双层波纹管作为冷却电缆的液氮套管。波纹管内含有超导电缆时液氮的流动压力损失是其低温系统设计的重要参数。超导电缆根据实际布置需要,存在按一定角度倾斜排布的情况。对倾斜角度的波纹管进行了液氮流动实验,考察倾斜角度和流动阻力系数的关系。同时,也对光滑圆管进行不同倾斜角度的CFD仿真,考察光滑圆管内液氮流动受到不同角度下重力作用的影响。通过上述两方面的研究,得出结论认为在超导电缆实际应用中,电缆的倾斜不会对液氮的流动压力损失造成明显影响。High temperature superconducting（HTS） cable mostly uses pipe -in -pipe casing bellows with high vacuum and multilayer insulation protection for holding the coolant LN2. Pressure drop of the LN2 flow in the bellows with high temperature superconducting cable installed is one of the most important parameters for designing the cooling loop system. Some incline of the bellows is necessary in the engineering implementation of cable arrangement. Experiments were performed on an inclined bellows to investigate how the friction factor changes with the tilt angle. A batch of turbulent flow in pipes at different tilt angle was simulated by Computational Fluid Dynamics（CFD）. A conclusion could be drawn upon the results that the tilt angle has little affection on friction factor.

关 键 词：液氮 管内流动 倾斜角 流动阻力系数 实验测量 CFD仿真 

分 类 号：TQ569[化学工程—炸药化工]