摘要
低温分配阀箱的多层绝热传热性能对稳态强磁场实验装置的正常运行至关重要。对真空多层绝热,进行了多层绝热材料的选择,然后采用逐层分析模型,并引入层密度这一变量,利用Visual Fortran编程计算,获得多层绝热辐射传热、固体导热以及总热流密度随层密度的变化情况。针对层间真空度对总热流密度的影响进行了分析计算。得出低温分配阀箱多层绝热的最佳层密度为19层/cm,总层数为30层,层间真空度至少要达到0.01 Pa,此时的热流密度为每立方米0.49瓦。
The performance of multilayer insulation is very important for the normal operation of the cryogenic distribution valve box. For vacuum muhilayer insulation, the material of multilayer insulation was chosen firstly. Then with the layer density as a variable the layer-by-layer model was adopted. Using the Visual Fortran program to do the calculation, to find out how the radiation heat transfer , solid conduction and the total heat flux change. With the changes of the interstitial vacuum, the analysis of the total heat flux was carried out. The results showed that for the multilayer insulation of the cryogenic distribution valve box the optimum layer density is 19 layers/cm, and the number of the total layers is 30, and the requirement of the interstitial vacuum degree is higher than 0.01 Pa. At last the heat flux is 0.49 watt per cubic meter
出处
《低温工程》
CAS
CSCD
北大核心
2013年第5期41-45,共5页
Cryogenics
关键词
低温分配阀箱
多层绝热
层密度
真空度
cryogenic distribution valve box
multilayer insulation
layer density
vacuum degree
