摘要
基于多通道液氦低温传输管线的结构设计与理论建模,分析了不同温区下真空多层绝热材料层数、层密度对热流密度和表观导热系数的影响.模拟了同轴液氦低温传输管线直管段和弯管段的温度场和漏热量分布.对比了不带辐射屏和带辐射屏的液氦低温传输管线漏热量.结果表明:在4.5~293.0 K,选取层数50层、层密度为25层/cm多层绝热材料,表观导热系数为0.119 mW/(m·K);在4.5~77.0 K,选取层数50层、层密度为30层/cm多层绝热材料,表观导热系数为0.028 mW/(m·K);当不带辐射屏时,单个双棱支撑漏热量为0.207 W,直管段和弯管段多层绝热材料漏热量分别为0.471和0.460 W/m.对比不带辐射屏和带辐射屏的液氦低温传输管线,漏热量分别为0.581和0.029 W/m,带液氮辐射屏的液氦低温传输管线漏热量减少了95%.
Structural design and theoretical model of multi-channel liquid helium cryogenic transfer line were proposed.The effects of number of layer and layer density of multilayer insulation materials(MLI)on heat flux density and apparent thermal conductivity were calculated and analyzed.The temperature and heat leakage distributions of straight and elbow pipes of coaxial liquid helium cryogenic transfer line were simulated.Heat leakages of liquid helium cryogenic transfer lines without radiation shield and with radiation shield were compared.Theoretical and simulation results show that apparent thermal conductivity of multi-layer insulation(MLI)is 0.119 mW/(m·K)for 50 layers and 25 layers/cm at temperature range of 4.5~293.0 K.The apparent thermal conductivity is0.028 mW/(m·K)for 50 layers and 30 layers/cm at temperature range of 4.5~77.0 K.The heat leakage of two-plate support is 0.207 W,and the heat leakage of MLI in straight pipe and elbow pipe is 0.471 and 0.460 W/m,respectively.The heat leakage of liquid helium cryogenic transfer lines without radiation shield and with radiation shield is 0.581 and 0.029 W/m respectively,and the heat leakage of liquid helium cryogenic transfer line with radiation shield is reduced by 95%compared without radiation shield.
作者
邓笔财
谢秀娟
杨少柒
李青
DENG Bicai;XIE Xiujuan;YANG Shaoqi;LI Qing(State Key Laboratory of Technologies in Space Cryogenic Propellants,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第2期6-10,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家重大科研装备研制资助项目(ZDYZ2014-1).
关键词
多通道液氦低温传输管线
结构设计
漏热量
绝热支撑
多层绝热材料
multi-channel liquid helium cryogenic transfer line
structural design
heat leakage
adiabatic support
multi-layer insulation
作者简介
邓笔财(1991-),男,博士研究生,E-mail:bcdeng@mail.ipc.ac.cn.
