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作 者:许张良 谭宏博[1] 吴昊[1] XU Zhangliang;TAN Hongbo;WU Hao(Institute of Refrigeration and Cryogenic Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
机构地区:[1]西安交通大学制冷与低温技术研究所,西安710049
出 处:《真空与低温》2024年第4期382-391,共10页Vacuum and Cryogenics
基 金:国家重点研发计划(2020YFB1506203)。
摘 要: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0.117 5 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0.121 0 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。To explore the effect of integrating different types of para-ortho hydrogen conversion with the Variable Density Multilayer Insulation(VDMLI) structure combining one Vapor Cooled Shield(VCS) on thermal insulation performance improvement of liquid hydrogen storage tanks,a steady-state heat transfer model for the composite insulation structure 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 analyzed.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 0.117 5 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 absorption during the conversion can be increased,which is beneficial to offset the external heat flux and improve the thermal insulation performance.This study provides quantitative theoretical basis and technical guidance for the design of the composite insulation structure in liquid hydrogen temperature range.
关 键 词: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
分 类 号:TB61[一般工业技术—制冷工程]
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