250 W@70 K单级G-M制冷机回热器优化及实验研究

Optimization and Experiment of Regenerator for 250 W Single-stage G-M Cryocooler at 70 K

摘要: 为满足高温超导电缆等超导应用的冷量需求，以250 W@70 K制冷量为研究目标，对G-M冷头回热器进行了设计优化及实验研究。采用数值模拟软件Regen分析了回热器结构尺寸、冷端质量流量以及蓄冷填料填充方式对制冷性能的影响。基于回热器设计参数，加工了一台样机并搭建了实验测试平台，测试结果表明，此单级G-M制冷机可以获得23.5 K的最低温度，70 K时可获得243 W的制冷量。

Abstract: To meet the demand of large cooling capacity for high temperature superconducting cable and other high temperature superconducting application equipment,the author takes the cooling capacity of 250 W@70 K as the research target, the design optimization and experimental research for the G-M regenerator are carried out.Based on the numerical simulation software Regen,the effect of the structure size of the regenerator,the mass flow of the cold end and the filling method of regenerator on the refrigeration performance are analyzed.The experimental system is setted up to test performance of prototype.The results show that this single-stage G-M cryocooler can obtain the lowest temperature of 23.5 K,and 243 W cooling capacity at 70 K.