低温超导线圈失超过程中力学及多场效应  

Mechanical responses and multi-field effects during quench process in LTS coil

作　　者：焦若姗 童玉锦 关明智[1,2] Jiao Ruoshan;Tong Yujin;Guan Mingzhi(Key Laboratory of Mechanics on Westem Disaster and Environment,Ministy of Education,College of Civil Engieing and Mehanics,Lanzhou Universty Lanzhou 73000,China 2.Institute of Modem PhysicsChinese Academy of Seiences,Lanzhou 73000,China)

机构地区：[1]兰州大学土木工程与力学学院西部灾害与环境力学教育部重点实验室,兰州730000 [2]中国科学院近代物理研究所,兰州730000

出　　处：《低温与超导》2022年第9期16-22,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金(12172357,11932008);中国科学院青年创新促进会会员基金(2019404)资助。

摘　　要：开展了5 T分体式超导组合磁体中NbTi低温超导主线圈结构失超过程中力学及多场行为分析,建立了考虑瞬态效应的二维电磁-力-热耦合的控制方程,采用COMSOL Multiphysics耦合场分析模块对其进行求解,得到了失超过程中超导线圈中的电压、温度、应力-应变和应变率的演化规律。结果表明:失超过程中,在超导磁体到达临界温度前,径向应变会出现极值点;应变率有规律性的突变行为,其突变峰值正好对应临界温度到达时刻;超导线圈应力/应变会随着局部温度的升高而增大,并在失超保护过程中达到峰值。The mechanical and its multi-field behavior analysis of a NbTi superconducting main coil in 5 T split superconducting magnet during the quench process were carried out. A two-dimensional electromagnetic-mechanical-thermal coupling governing equation was established considering the transient effect.The COMSOL multiphysics coupled field analysis module was used to solve it. The evolution laws of voltage, temperature, stress-strain and strain rate in the superconducting coil were obtained.The results show that during a quenching, the radial strain will have an extreme point before reaching the critical temperature, the regular mutation behaviors are observed on corresponding strain rate, and its peak corresponds to the moment when the critical temperature is reached;axial and radial stress or strain in superconducting coils increases with local temperature and peaks during quench protection.In addition, the increase of the copper ratio and inner diameter of the coil can significantly reduce its stress or strain during quenching.

关 键 词：低温超导磁体 失超保护 多场行为 应变及应变率 

分 类 号：O343.6[理学—固体力学]