摘要
为建立碱金属高温热管启动瞬态和运行稳态工作特性预测方法,本研究采用有限体积法(FVM)建立管壁导热模型、吸液芯流动传热模型和蒸气区模型。基于C语言开发并验证了碱金属高温热管的冷态启动瞬态分析程序,最大相对偏差为9.8%。仿真模拟了单根水平钠热管启动瞬态并开展敏感性分析,结果显示:对于本研究中使用的热管,在固定输入功率为1 000 W的环境条件下,启动开始后700 s热管蒸气区完全进入连续流态,到达稳态总用时为3 000 s,启动过程中工质熔化阶段吸液芯内部压力相对值逐渐增大,熔化完成后压力相对值略有降低;稳态运行下热管等温性良好,外壁面轴向温差稳定在22.5 K,吸液芯内部压降约为47 Pa;环境温度升高会延长热管到达稳态所需时间,并对稳态蒸气压力和流速分布产生一定影响;绝热段长度增加同样延长了热管启动到达稳态时间,同时对吸液芯内流体压力和速度分布存在一定影响。
In recent years,heat pipe has been widely used as an efficient heat transfer equipment in fuel chemistry,electronic communication and so on.The main structure of a heat pipe mainly includes the vacuum tube containing alkali metal working fluid and the composite mesh wick on the inner wall of the tube.In the axial direction,heat pipes are generally divided into three parts:evaporation section,adiabatic section and condensation section.Heat is input into the heat pipe through the evaporation section and output through the condensation section.The adiabatic section only plays a role in connecting and mass transfer.The length of each area can be flexibly arranged.In the radial direction,heat pipes are generally divided into outer wall surface,wick and vapor area.Alkali metal high-temperature heat pipes show broad application prospects in the nuclear reactor cooling and other aspects because of their strong heat transfer capacity and inherent safety at high temperature.Because the working fluid of these heat pipes is solid at room temperature,and whose saturated vapor pressure relatively low,their frozen start-up has a complex phase change process of the working fluid,so it brings some difficulties to the study of the frozen start-up of the high-temperature heat pipes.For different application scenarios,it is necessary to study the transient and steady-state operating characteristics of high-temperature heat pipes,to provide support for the application of high-temperature heat pipes in a variety of applicable scenarios.To establish a method for predicting the transient start-up and steady-state operation characteristics of alkali metal high-temperature heat pipes,this study utilized the finite volume method(FVM)to establish the pipe wall heat conduction model,the wick flow heat transfer model,and the vapor zone model.A frozen start-up transient analysis program for alkali metal high-temperature heat pipes was developed and verified using the C programming language,with a maximum relative deviation of 9.8%.Transient st
作者
赵昊城
张泽秦
王成龙
秋穗正
田文喜
苏光辉
ZHAO Haocheng;ZHANG Zeqin;WANG Chenglong;QIU Suizheng;TIAN Wenxi;SU Guanghui(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《原子能科学技术》
EI
CSCD
北大核心
2024年第1期50-59,共10页
Atomic Energy Science and Technology
基金
国家自然科学基金(U2067208)。
关键词
高温热管
数值模拟
冷态启动
有限体积法
high-temperature heat pipe
numerical simulation
frozen start-up
finite volume method
