Two-Dimensional Anisotropic Model of YBCO Coated Conductors
Two-Dimensional Anisotropic Model of YBCO Coated Conductors
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DOI：
10.1109/tasc.2014.2341180
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发表时间：
2015-02
影响因子：
1.8
通讯作者：
M. Casali;M. Breschi;P. Ribani
中科院分区：
文献类型：
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作者：
M. Casali;M. Breschi;P. Ribani
第二代YBCO涂层导体（CC）带材在高温下传输高电流密度的能力，即，高达77 K，并且在非常高的磁场下，即，20 T以上，正在推动这些磁带在各种应用中的使用，从磁铁到电力系统技术。精确研究它们的失超行为对于设计和安全使用这种陶瓷超导材料制造的电缆和磁体是强制性的。为此，在COMSOL Multiphysics环境下建立了一个新的二维有限元数值失超模型，即YBCO超导体各向异性失超模型。用有限元法模拟YBCO带材的最困难的问题之一是，由于YBCO层的厚度非常小，约为1 μm，因此它们的高纵横比。在开发的模型中，高纵横比的磁带的问题是通过乘以一个常数因子的磁带厚度，然后通过引入材料的各向异性特性补偿热和电平衡方程来解决的。最小淬火能量和正常区扩展速度的有限元模型与文献实验数据进行了比较，验证。
The ability of second-generation YBCO coated conductor (CC) tapes to transport high current densities at high temperature, i.e., up to 77 K, and at very high magnetic fields, i.e., above 20 T, are pushing the use of these tapes in various applications, from magnet to power system technologies. An accurate study of their quench behavior is mandatory for the design and safe use of cables and magnets manufactured with this ceramic superconducting material. A new 2-D finite-element method (FEM) numerical quench model, which is called anisotropic model of YBCO CCs, was built for this purpose in the COMSOL Multiphysics environment. One of the most difficult issues in the modeling of the YBCO tapes with the FEM is their high aspect ratio due to the very small thickness of the YBCO layer, about 1 μm. In the model developed, the problem of the high aspect ratio of the tape is tackled by multiplying the tape thickness by a constant factor and then compensating the heat and electrical balance equations through the introduction of material anisotropic properties. The FEM model is validated by comparison with literature experimental data on minimum quench energy and normal zone propagation velocity.