原子能科学技术2024，Vol.58Issue(1)：60-68,9.DOI:10.7538/yzk.2023.youxian.0057
基于多物理耦合的高温热管流动传热和力学特性研究
Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling
摘要
Abstract
Heat pipe cooled reactor has the advantages of simple structure,expandabili-ty,safety and reliability,and is one of the ideal choices for space and deep sea nuclear power.However,the thermal expansion effect of the heat pipe inside the core when operating under high temperature conditions can cause the heat pipe to deform,which affects the heat transfer capability and operating stability of the heat pipe.Therefore,it is important to study the flow,heat transfer and mechanical properties of the high tem-perature alkali metal heat pipe for the safety of heat pipe cooled reactor.In this work,a multiphysics coupled model of the high temperature heat pipe was constructed using COMSOL Multiphysics finite element software.The steady-state,weakly compressible laminar flow model was used for the gas part,and the porous medium model based on Darcy's law was used for the region of wick.The flow heat transfer characteristics of the working medium inside the heat pipe and the thermal expansion effect of the pipe wall were studied by numerical simulation.The results show that the relative error between the calculated results and the experimental values of the model is less than 1％,the flow heat transfer characteristics of the high temperature heat pipe can be accurately simulated by the model in this paper.The model can reveal the heat and mass transfer mechanism inside the alkali metal heat pipe more comprehensively and obtain the pres-sure and velocity information inside the heat pipe that can't be measured experimental-ly.The pressure gradient and temperature gradient along the axial direction during the operation of the heat pipe are small and have good isothermal properties.The high temperature of the heat pipe operation will cause the wall to expand,and there is a maximum 1.75％total deformation compared to the cold state at rated power.The vari-ation of the transmission power can significantly affect the distribution characteristics of the key parameters of the working medium inside the heat pipe.The increase of power leads to the decrease of the vapor flow rate and the increase of the liquid flow rate inside the heat pipe,which raises the operation temperature and increases the deformation of the wall at the same time.During engineering fabrication and assembly,improper control of heat pipe deformation may result in excessive stress values at the heat pipe and reactor core assembly connection,and the effect of heat pipe deformation needs to be considered to improve the operational stability of the heat pipe reactor.关键词
碱金属热管/两相流动传热/固体力学/多物理耦合Key words
alkali metal heat pipe/two-phase flow heat transfer/solid mechanics/multi-physical coupling分类
能源科技引用本文复制引用
焦广慧,代丽红,夏庚磊,王建军,彭敏俊..基于多物理耦合的高温热管流动传热和力学特性研究[J].原子能科学技术,2024,58(1):60-68,9.基金项目
哈尔滨工程大学博士生"核+X"联合创新基金(HLJ202207) （HLJ202207）
