紧凑型托卡马克极向场磁体涡流损耗计算研究

Research on computation of eddy current loss of poloidal field magnets of compact Tokamak

采用商业化有限元计算软件COMSOL,针对紧凑型托卡马克实验装置理论样机中的极向场磁体金属结构件进行涡流仿真。通过偏微分方程(PDE)接口,解决了内置的磁场(MF)接口在暂态涡流仿真过程中无法设置内部接触边界绝缘的问题,并大大降低了计算时间。通过对金属结构件涡流特性的研究,提出两种涡流抑制方法:更换材料与开槽,并讨论了这两种方法对涡流损耗的抑制效果。结果表明,开断槽对涡流损耗的抑制效果尤为显著。

The commercial finite element calculation software COMSOL was used to carry out eddy current simulation for the metal structural components of the poloidal field magnets in the theoretical prototype of the compact Tokamak experimental de⁃vice.By using the partial differential equation(PDE)interface,the problem of the built-in magnetic field(MF)interface be⁃ing unable to set internal contact boundary insulation during transient eddy current simulation was solved,and the calculation time was greatly reduced.By studying the eddy current characteristics of metal structural components,two eddy current suppression methods were proposed:replacing materials and grooving,and the suppression effects of these two methods on eddy current losses were discussed.The results indicate that the effect of broken grooves on suppressing eddy current losses is particularly significant.