低温推进剂贮箱气冷屏复合绝热结构综合优化设计  

Comprehensive Optimization Design of VCS Composite Thermal Insulation Structure for Cryogenic Propellant Tank

作　　者：余建榕 张强[2] 康慧芳 章丹亭 YU Jianrong;ZHANG Qiang;KANG Huifang;ZHANG Danting(Institute of Thermal Engineering,School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Aerospace Propulsion Institute,Beijing 100076,China)

机构地区：[1]北京理工大学机械与车辆学院热能工程研究所,北京100081 [2]北京航天动力研究所,北京100076

出　　处：《真空与低温》2021年第2期165-170,共6页Vacuum and Cryogenics

基　　金：装备预研航天科技联合基金(6141B06260404)。

摘　　要：气冷屏复合绝热(VSC)结构可以有效减少低温推进剂蒸发损耗。目前尚缺乏对气冷屏复合绝热结构的综合优化设计,现有的研究方法不能准确反映出漏热量与多层变密度材料导热性能及冷屏屏位之间的关系。为此,考虑多层变密度材料导热系数随冷屏位置的变化,对复合绝热结构进行综合优化设计,研究冷屏位置和多层变密度结构的相互影响规律,分析了最佳层密度与最佳屏位。结果表明,加入气冷屏后,降低中密度区层密度,增加高密度区层密度可以进一步减少漏热量。对于不同的层密度组合,存在一个最佳屏温,当冷屏处于该温度时漏热量最小。The VCS composite insulation structure can effectively reduce the evaporation loss.At present,there is still no comprehensive optimization design for the VCS composite insulation structure.The existing research methods cannot accurately reflect the accurate relationship among the heat flux and the thermal conductivity of the Variable-Density Multilayer Insulation(VD-MLI)and the cold screen position.This paper considers the thermal conductivity of VD-MLI with the change of cold screen position,studies the interaction law of VCS position and VD-MLI,and analyzes the best density of VD-MLI and the best position of VCS.The research results indicate that after adding the air-cooled screen,reducing the density of the medium-density layer and increasing the density of the high-density layer can further reduce the heat leakage.For different combinations of layer densities,there is an optimum screen temperature that minimizes heat leakage when the cold screen is at this temperature.

关 键 词：气冷屏复合绝热 变密度多层绝热 漏热量 层密度 屏位 

分 类 号：TB611[一般工业技术—制冷工程]