热扰动冲击下的高温超导电缆失超恢复特性  

Numerical Analysis on the Quench and Recovery of the High Temperature Superconducting Cable Subjected to Thermal Disturbance

作　　者：祝乘风 厉彦忠[1] 谭宏博[1] 史佳敏 聂杨 Zhu Chengfeng;Li Yanzhong;Tan Hongbo;Shi Jiamin;Nie Yang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an,710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《电工技术学报》2021年第18期3884-3890,共7页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2018YFB0904400)。

摘　　要：高温超导(HTS)电缆在运行过程中,不可避免会遇到热扰动冲击,当热扰动能量足够大时会引起高温超导电缆的局部失超,并沿着电缆轴向传播。该文通过建立等效电路模型和一维传热模型,实现电场和温度场的耦合求解,得到高温超导电缆在热扰动冲击下的失超恢复特性,并考虑热流脉冲和液氮流速对电缆失超恢复过程的影响。结果表明:当热扰动能量低于临界恢复能量时,高温超导电缆在液氮冷却下逐渐恢复至超导态;否则,电缆的失超段将沿着轴向传播,导致电缆整体失超。随着努塞尔数的增大,临界恢复能量呈指数增大。电缆恢复时间与液氮流速呈幂律关系。该文计算结果对高温超导电缆的正常运行具有指导意义。During the operation of HTS cable,it is inevitable to encounter thermal disturbance.If the thermal disturbance is large enough,local quench will occur and spread along the cable.By establishing the equivalent circuit model and one-dimensional heat transfer model,the coupling solution of electric field and temperature field was realized in this paper.The quench and recovery characteristics in the superconducting cable were obtained,and the influence of liquid nitrogen flow rate and heat pulse energy on the quench propagation was considered.The results show that when the thermal disturbance energy is lower than the critical recovery energy,the cable returns to superconducting stage by the cooling of liquid nitrogen.Otherwise,the local quench will propagate,leading to the whole quench of HTS.With the increase of Nusselt number,the critical pulse energy of recovery increases exponentially.The recovery time has a power law relationship with the liquid nitrogen flow rate.The analysis results provide the theoretical basis for the stable operation of HTS cables.

关 键 词：高温超导电缆 电磁热耦合 失超传播 热扰动 流动换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TM725[动力工程及工程热物理—热能工程]