Analysis of heat transfer characteristics of (6+1)-structure MgB2 cable

IF 1.8 3区 工程技术 Q3 PHYSICS, APPLIED
Yifeng Li, Shaotao Dai, Tao Ma, Lei Hu
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引用次数: 0

Abstract

MgB2 superconducting material has a wide range of application prospects for its high transition temperature, favorable structural characteristics and low cost. When using MgB2 to produce superconducting energy storage magnets, it is necessary to twist superconducting wires into cables to increase their current carrying capacity. One typical cable is made of 6 MgB2 superconducting wires wrapped around 1 central copper wire, forming a (6+1) structure. MgB2 coils used for energy storage require solid impregnation and can be cooled by liquid hydrogen or solid nitrogen. Due to the need for fast charging and discharging of energy storage coils and low thermal conductivity of commonly used epoxy resin impregnation and solid nitrogen, it is necessary to consider the temperature variation characteristics caused by AC loss and eddy current loss during operation process. A coil with 8 turns in each layer and 4 layers is simulated using the (6+1)-structure cable. In order to obtain better temperature distribution results while reducing the time required for simulation operation, the simulation time is set to 1 s. The impact of epoxy resin properties and surrounding environments on the coil are then analyzed. The results indicate that increasing the thermal conductivity of epoxy resin can significantly reduce the maximum temperature of the coil, while only changing the cooling method is unhelpful in dealing with the problem of local overheating of the coil.

(6+1)- 结构 MgB2 电缆的传热特性分析
超导材料具有较高的转变温度、良好的结构特性和较低的成本,因此具有广泛的应用前景。在生产超导储能磁体时,有必要将超导线扭绞成缆,以提高其载流能力。一根典型的电缆由 6 根超导线缠绕在 1 根中心铜线上,形成(6+1)结构。用于储能的线圈需要固体浸渍,可以用液氢或固态氮冷却。由于储能线圈需要快速充放电,而常用的环氧树脂浸渍和固态氮的导热率较低,因此有必要考虑运行过程中交流损耗和涡流损耗引起的温度变化特性。使用 (6+1) 结构电缆模拟了每层 8 匝、共 4 层的线圈。为了获得更好的温度分布结果,同时减少模拟运行所需的时间,模拟时间设定为 1 秒。结果表明,提高环氧树脂的导热系数可显著降低线圈的最高温度,而仅改变冷却方式无助于解决线圈局部过热的问题。
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来源期刊
Cryogenics
Cryogenics 物理-热力学
CiteScore
3.80
自引率
9.50%
发文量
0
审稿时长
2.1 months
期刊介绍: Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics
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