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仲-正氢转化对蒸气冷屏组合结构绝热性能提升研究

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为探究蒸气冷屏-变密度多层绝热组合绝热结构中耦合不同仲-正氢转化类型对液氢储罐绝热性能的提升效果,建立了采用连续转化与绝热转化的组合绝热结构稳态传热模型,并分析了蒸气冷屏屏位与仲-正氢转化器位置对组合绝热结构性能的影响.研究表明:与绝热转化相比,采用连续转化时绝热结构的性能更优,其最小漏热热流密度为 0.1175 W·m-2,与不采用仲-正氢转化相比减少了 13.48%;若采用绝热转化,当仲-正氢转化器到VCS盘管入口的距离与盘管总长度之比为30%~77.5%时,漏热热流密度达到最小值0.1210 W·m-2,比不采用仲-正氢转化减少了 10.30%;转化器安装在盘管中间附近位置,可提高绝热转化的起始温度与仲-正氢转化吸热量,对抵消外界热流、改善绝热性能有益.研究结果为液氢温区组合绝热结构的设计提供定量的理论依据和技术指导.
Study on Performance Improvement of Composite Thermal Insulation Structure Combining Vapor Cooled Shield by Integrating Para-ortho Hydrogen Conversion
To explore the effect of integrating different types of para-ortho hydrogen conversion with the Variable Den-sity Multilayer Insulation(VDMLI)structure combining one Vapor Cooled Shield(VCS)on thermal insulation perfor-mance improvement of liquid hydrogen storage tanks,a steady-state heat transfer model for the composite insulation struc-ture with the continuous and adiabatic para-ortho hydrogen conversion was established.The influence of the VCS position and the para-ortho hydrogen converter position on the insulation performance of the composite insulation structure was ana-lyzed.The results show that the performance of the insulation structure with the continuous conversion is better than that with the adiabatic conversion.The minimum heat leakage of the structure with the continuous conversion is 0.1175 W·m-2,13.48%less than that without para-ortho hydrogen conversion.If the adiabatic conversion is used,the minimum heat leakage can reach 0.1210 W·m-2 with a reduction of 10.30%compared with that without para-ortho hydrogen conversion,when the ratio of the distance between the converter and the VCS tube inlet to the total length of the VCS tube is 30%to 77.5%.When the converter is installed near the middle of the tube,the initial temperature of the adiabatic conversion and the heat absorp-tion during the conversion can be increased,which is beneficial to offset the external heat flux and improve the thermal insu-lation performance.This study provides quantitative theoretical basis and technical guidance for the design of the composite insulation structure in liquid hydrogen temperature range.

VCSVDMLIpara-ortho hydrogen conversionthermal insulation performanceconverter position

许张良、谭宏博、吴昊

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西安交通大学 制冷与低温技术研究所,西安 710049

蒸气冷屏 变密度多层绝热 仲-正氢转化 绝热性能 转化器位置

国家重点研发计划

2020YFB1506203

2024

真空与低温
中国航天科技集团公司第五研究院510研究所

真空与低温

CSTPCD
影响因子:0.567
ISSN:1006-7086
年,卷(期):2024.30(4)