高温锂热管三相耦合数值模拟  

Numerical Simulation of Three-Phase Coupling for High-Temperature Lithium Heat Pipe

作　　者：毛赏 周涛 刘文斌[1,2,3] 魏东 薛春辉 Mao Shang;Zhou Tao;Liu Wenbin;Wei Dong;Xue Chunhui(Department of Nuclear Science and Technology,School of Energy and Environment,Southeast University,Nanjing,210096,China;Institute of Nuclear Thermal-hydraulic Safety and Standardization,Nanjing,210096,China;National Engineering Research Center of Power Generation Control and Safety,Nanjing,210096,China)

机构地区：[1]东南大学能源与环境学院核科学与技术系,南京210096 [2]核热工安全与标准化研究所,南京210096 [3]大型发电装备安全运行与智能测控国家工程研究中心,南京210096

出　　处：《核动力工程》2022年第6期37-42,共6页Nuclear Power Engineering

基　　金：国家重点研发计划(2020YFB1901700);2021年江苏省“双创人才”(JSSCRC2021500);“双一流”学科建设专项资金(教师启动基金3203002104A2)。

摘　　要：为了研究锂热管的传热机理,推动锂热管在小堆中的应用。采用COMSOL Multiphysics软件,建立了管壁、吸液芯和管内蒸气腔室的固液气三相耦合模型,对热管的温度分布、压力分布和速度分布进行计算。结果表明:当蒸发段的热流从13.9 kW增加到20.8 kW时,管壁温度、蒸气温度、蒸气压力以及吸液芯内部的液体压力、液体轴向速度随着加热功率的增加而增加,蒸气轴向速度随着加热功率的增加先增加后降低。在稳态运行时,管壁温度呈现阶梯形下降,而蒸气温度和压力基本保持不变,表明了锂热管具有良好的等温性。To study the heat transfer mechanism of lithium heat pipes and to improve their application in small reactors,a solid-liquid-gas three-phase coupled model of the tube wall,the wick and the vapor chamber inside the tube is developed using COMSOL Multiphysics software.The results show that when the heat flow in the evaporation section increases from 13.9 kW to 20.8 kW,the pipe wall temperature,steam temperature,steam pressure,liquid pressure inside the wick,and liquid axial velocity increase with the increase of heating power,while the steam axial velocity first increases and then decreases with the increase of heating power.In the steady-state operation,the pipe wall temperature decreases step by step,while the vapor temperature and pressure remain basically unchanged,indicating that the lithium heat pipe has good isothermality.

关 键 词：高温热管 锂热管 耦合模型 数值模拟 

分 类 号：TL333[核科学技术—核技术及应用]