温度回路-小孔脉管制冷中的新现象  

TEMPERATURE LOOP, A NEW PHENOMENON IN A GM-TYPE ORIFICE PULSE TUBE REFRIGERATOR

作　　者：甘智华[1] 

机构地区：[1]浙江大学制冷与低温研究所,浙江杭州310027

出　　处：《工程热物理学报》2005年第3期388-390,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目资助(No.50106013)德国学术交流中心DAAD回访计划资助

摘　　要：一台可工作在双向进气模式和小孔模式下的单级脉管制冷机,当双向进气方式采用并联双阀双向进气时,最低制冷温度为19.3K,50K以下的制冷量变化约为2W/K;当双向进气阀门关闭时,制冷机就工作在小孔模式下,最近的研究工作发现,当制冷机工作在小孔模式下时出现了一个新的现象-脉管冷端温度存在温度回路,该特点与脉管冷端的热负荷及小孔开度的调节方法有关,该现象的发现对于理解双向进气模式下温度不稳定问题提供了一个新的思路。The lowest temperature was 19.3 K and 60.4 W at 48.5 K in a GM type pulse tube cooler in which the double-inlet mode was consist of two parallel-placed needle valves with opposite flow direction instead of conventional single-valved configuration. In recent experiments a new phenomenon, temperature loop, was found when the cooler working in orifice mode. This phenomenon depends on the heat load and on the adjustment of the needle valve connecting the pulse tube warm end with the buffer volume. It will give a new way to understand the temperature instability which sometimes happens in double-inlet mode of pulse tube cryocoolers.

关 键 词：脉管制冷 双向进气 稳定性 小孔型 温度回路 

分 类 号：TB661[一般工业技术—制冷工程]