超导电缆循环过冷液氮温度场模拟

摘要

A model was established that the sub-cooled liquid nitrogen was forced to flow and cool the superconducting cable in cryostat. For 30 m long superconducting cable, the liguid nitrogen temperature field was simulated by using Fluent as the flow, terminal heat leak, or AC loss varied. The results show that the terminal heat leak and AC loss are constant, the maximum liguid nitrogen temperature at the outlet cross-section will decrease as the flow increases;the flow and AC loss are constant, the maximum liguid nitrogen temperature at the outlet cross-section will increase as the terminal heat leak increases. If the flow and terminal heat leak are constant, the maximum liquid nitrogen temperature at the outlet cross-section has no visual variation as the AC loss varies.%建立了循环过冷液氮在恒温器内迫流冷却超导电缆的模型,利用Fluent软件模拟了30 m电缆系统内液氮温度场在不同流量、终端漏热、交流损耗等工况条件下的变化情况.仿真结果表明,在终端漏热和交流损耗一定时,液氮出口断面的最高温度随流量的增大而降低；在流量和交流损耗一定时,液氮出口断面的最高温度随终端漏热的增大而升高；在流量和终端漏热一定时,液氮出口断面的最高温度随交流损耗的变化不明显.