基于改进集总参数法的锂热管稳态性能分析  

Steady state performance analysis of lithium heat pipe based on improved lumped parameter model

作　　者：胡崇举 李斌 余大利 张秀香 梅华平[2] 李桃生[2] 王红艳[1] HU Chongju;LI Bin;YU Dali;ZHANG Xiuxiang;MEI Huaping;LI Taosheng;WANG Hongyan(Suzhou University,Suzhou 234000,China;Institute of Nuclear Safety Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Taiyuan North Permanent Magnet Motor Technology Co.,Ltd,Taiyuan 030003,China)

机构地区：[1]宿州学院,宿州234000 [2]中国科学院合肥物质科学研究院核能安全技术研究所,合肥230031 [3]太原北方永磁电机科技有限公司,太原030003

出　　处：《核技术》2024年第12期129-139,共11页Nuclear Techniques

基　　金：安徽省自然科学基金(No.2308085MA21);安徽省重点研究与开发计划项目(No.2022107020018);合肥市自然科学基金项目(No.2022032);宿州学院科研平台开发课题(No.2022ykf07);宿州学院博士启动基金(No.2024BSK010);安徽省教育厅中青年教师带头人培育项目(No.DTR2023054)资助。

摘　　要：高温热管在空间核动力和小型可移动核电源中具有广泛的应用前景,由于内部机理复杂,开发物理模型较完整而求解简单的计算方法一直是研究的热点。本文提出了一种改进的集总参数数值热管模型,该模型考虑不同流动形态与马赫数对蒸汽流动的影响以及吸液芯工质的变化,并分析了HP-STMC空间堆超长锂热管的流动与传热特性。针对固体和流体区域,建立了基于环空丝网吸液芯的热管集总参数微分方程组,使用Python程序进行求解并与其他程序对比验证,采用该模型模拟了在定热沉和定工作温度下锂热管运行参数的变化。结果表明:1)该程序具有良好的精度;2)定热沉下,随着加热功率增加,热阻、蒸汽流速以及吸液芯干燥度下降;3)定工作温度下,当蒸汽未达到湍流时总热阻及蒸汽热阻变化很小,而当蒸汽进入湍流时热阻快速增加,且蒸汽流速和吸液芯干燥度上升,而液体工质不会达到湍流且流速很小,最大雷诺数和流速分别约为260 m·s^(-1)和0.12m·s^(-1);4)对于超长锂热管在1800K及以下工作时蒸汽热阻约占总热阻的3.9%。本文研究结果对以锂热管为代表的碱金属热管应用提供了理论基础。[Background]High-temperature heat pipes,as heat transfer components with high efficiency,safety,and the advantage of not requiring additional power,have broad applications in space nuclear power and small,mobile nuclear power sources.Due to the complexity of the internal mechanisms of high-temperature heat pipes,steady state performance analysis is important for design and operation of lithium heat pipe.[Purpose]This study aims to develop an improved lumped parameter numerical heat pipe model with a more complete physical model and a simpler solution for steady state performance analysis of lithium heat pipe.[Method]First of all,the physical operation of the high-temperature heat pipe was considered to be composed of heat transfer cycles and fluid flow cycles,and the influence of different flow forms,compressibility,and Mach numbers on steam flow,as well as the variation of the liquid core working fluid,were taken into account into the fluid flow cycle.Then,the high-temperature heat pipe was divided into the evaporation section,adiabatic section,and condensation section,each consisting of solid,liquid,and vapor regions,and each part was treated as a node,with physical parameters concentrated on the nodes.Subsequently,thermal conduction differential equations,fluid flow differential equations,and thermodynamic differential equations were established for each node as needed,combining all the differential equations to form a system of differential equations based on the lumped parameter heat pipe with a combined annular and mesh wick.Thereafter,the finite difference method was employed to discretize the system of differential equations,and a Python program was used for solving these equations.Finally,the above-mentioned model was employed to analyze the flow and heat transfer characteristics of the ultra-long lithium heat pipe in the HP-STMC space reactor,and simulate the variations in operating parameters of the lithium heat pipe under fixed heat sink and working temperature conditions.[Results]The research results

关 键 词：集总参数法 锂热管 PYTHON 流动与传热 超高温 数值模型 

分 类 号：TL331[核科学技术—核技术及应用]