结构参数对波纹管内液氮流动与能量损失的影响  

Influence of structure parameters on LN_2 flow and energy losses in bellows

作　　者：汤涛[1] 闫畅迪 黄永华[2] Tang Tao Yan Changdi Huang Yonghua(Shanghai Electric Cable Research Institute, Shanghai 200093, China Shanghai Jiao Tong University, Shanghai 200240, China)

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11期23-27,57,共6页Cryogenics and Superconductivity

摘　　要：高温超导电缆通常浸泡在采用真空多层绝热保护的双层波纹管内程管的液氮中。液氮在超导电缆内流动的压力损失和冷却效果是其运行系统设计的重要参数。对不同直径的波纹管进行了不同流量下的CFD仿真计算,结果表明流量越大、直径越小,压降越大;波高直径比与波高波距比不变时,波纹管的达西流动阻力系数与波纹管的直径基本无关;波纹管直径对超导电缆的沿程温升几乎没有影响;增大波纹管的直径能够大幅降低超导电缆的沿程能量损耗。该文结果为超导电缆设计过程中波纹管的选取提供了理论依据。High temperature superconducting cable（ HTC ）is generally immersed in LN2 coolant flow in pipe -in -pipe casing bellows with high vacuum and multilayer insulation protection. Pressure drop and temperature rise of the LN2 flow in the bellows with high temperature superconducting cable installed are most important parameters for designing the cooling loop system. Simulations by Computational Fluid Dynamics （CFD） were performed on such bellows with different structure geometries. The result shows that the pressure drop rises with the increasing flowrate, while the friction factor goes down. The friction factor is nearly independent on the diameter when the ratio of wave height either over diameter or wave length of the bellows keeps constant. The diameter has little effeet on the temperature rise along the distance. To reduce the energy loss, the diameter of the bellows is suggested to be enlarged. The present results can have significance for the optimal design of the cireulated cooling system for high temperature superconducting cable.

关 键 词：超导电缆 CFD仿真 流动压降 升温 沿程损失 

分 类 号：TQ116.15[化学工程—无机化工]