大口径低温管道变工况漏热特性分析与优化  

Analysis and optimization of heat leakage characteristics of large diameter cryogenic tube under variable working conditions

作　　者：崔晨[1,2] 郑建朋 陈六彪 郭嘉[1] 周远[1] 王俊杰[1,2] Cui Chen;Zheng Jianpeng;Chen Liubiao;Guo Jia;Zhou Yuan;Wang Junjie(Chinese Academy of Science Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院低温工程学重点实验室(理化技术研究所),北京100190 [2]中国科学院大学,北京100049

出　　处：《低温工程》2019年第3期25-28,共4页Cryogenics

基　　金：航天低温推进剂技术国家重点实验室基金课题(No.SKLTSCP1903);中国科学院前沿科学重点研究计划(QYZDY-SSW-JSC028)

摘　　要：建立了一个包含辐射漏热、固体导热和残余气体导热分析的复合热力学模型,对高真空绝热低温管道在热边界温度(环境温度)变化、冷边界温度变化(压力变化或者改变流体)和真空度变化等变工况的漏热特性开展了研究。结果表明,热边界温度(环境温度)对漏热量的影响显著高于冷边界温度改变(流体种类改变或者管道内压力变化)导致的影响;当真空度为10-10^-2Pa区间,随着真空的改善,漏热量明显变小,不过当真空度优于10^-3Pa时,真空的进一步改善对漏热量的影响不再显著。With the development of cryogenic technology, the application of low temperature tube has become more and more extensive. A comprehensive thermodynamic model containing radiation leakage heat, solid heat conduction and residual gas heat conduction is established. The cryogenic heat leakage characteristics, such as hot boundary temperature(ambient temperature) change, cold boundary temperature change(pressure change or changing fluid type) and vacuum degree change, have been investigated. The results show that the effect of hot boundary temperature(ambient temperature) on heat leakage is significantly higher than that caused by cold boundary temperature change(change of fluid type or fluid pressure in tube);when the vacuum degree is in the range of 10-10^-2Pa, the heat leakage increases rapidly with the increase of the vacuum degree;However, When the vacuum is below 10^-3 Pa, the vacuum change has little effect on the leakage heat.

关 键 词：低温管道 变工况 漏热 绝热 

分 类 号：TB657[一般工业技术—制冷工程] TB66