U型脉冲管制冷机中冷头连接管的影响  

Influences of connecting tube at cold head on performance of a U-shape pulse tube refrigerator

作　　者：张祥镇 胡剑英[1,3] 崔浩[1,2] 张丽敏[1] 罗二仓[1] 

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]航天低温推进剂技术国家重点实验室,北京100190

出　　处：《低温工程》2014年第1期1-5,共5页Cryogenics

基　　金：国家自然科学基金项目(No.51276187);国家基础研究计划项目(No.2010CB227303);NSFC-云南联合基金重点项目(No.U1137606)

摘　　要：研究了U型脉冲管制冷机冷头连接管直径、连接管长度、连接管两端锥管长度和脉管导流结构参数对制冷性能的影响,计算分析了连接管最佳参数随制冷温度、压比的变化情况。结果表明,连接管的直径对制冷性能具有显著的影响,并且存在最佳直径;连接管长度、压比和制冷温度的变化将对连接管最佳直径产生一定的影响;层流时,脉管导流结构中较小的丝网目数对制冷性能有改善,连接管两端设置较短的锥管对制冷性能有提高。A pulse tube refrigerator with a U-shape connecting tube was simulated to study the influ- ences of connecting tube, the cones and the flow straightener on the performance of the refrigerator. The in- fluence of the refrigerating temperature and pressure ratio on the best dimensions of connecting tube was also simulated. According to the simulation, the diameter of connecting tube influences the performance quiet much. The optimum dimensions of the connecting tube are affected by the pressure ratio and refrigerating temperature. When the flow is laminar, the performance will be improved by using flow straightener with less mesh screens and cones with shorter length.

关 键 词：U型脉冲管制冷机 冷头连接管 导流结构 

分 类 号：TB651[一般工业技术—制冷工程]