摘要
氦-氢分离床作为聚变堆氚工厂提取系统的重要部件,其压阻特性影响床体的吸附效率和系统阻力。本文通过开展径向吸附床压阻实验,获得过滤器和粉末多孔介质的压阻特性,并结合模拟软件拟合获得特性参数,进一步借助模型研究床体流动机理,指导结构设计和参数设置。获得的丝网过滤器压阻模型参数与实验结果对比,验证了模型的可靠性。当粉末颗粒度较大(Rp=125μm)时,Ergun模型参数可以较好地拟合床体实验压阻,但随着粉末粒度的减小,Ergun模型参数得到的压阻与实验值差距逐渐加大,需进一步修正模型参数。流动机理分析表明,丝网过滤器在实验测试条件下,压阻以惯性阻力项为主,随等效雷诺数的增加呈抛物线变化。床体粉末层压阻以黏性阻力项为主,随等效雷诺数的增加呈线性变化。
Helium-hydrogen separation bed is an important part of fusion reactor tritium extraction system.Its flow resistance characteristics affect the adsorption efficiency and system resistance.Radial adsorption bed structure can reduce the resistance.The main structure of the radial flow helium-hydrogen separation bed is composed of the central metal powder layer and the inner and outer filters that support the powder layer.The flow resistance of the bed is mainly composed of the central powder layer resistance and the inner-outer filter resistance.In this paper,the resistance characteristics of the filter and porous media were obtained by flow resistance experiment,and a two-dimensional numerical model of the fluid flow in a radial helium-hydrogen separation bed was developed using COMSOL software.The characteristic parameters were obtained by fitting the simulation software.The flow mechanism of fluidized bed was further studied by using this model to provide guidance for structural design and parameter optimization.The results show that combined with the experimental data of the single-layer sintered screen filter,the parameters of the screen filter resistance model are established,and the parameters of A 1 and B 1 are obtained(A 1=3.234×106,B 1=2.956×107),and the resistance model of the double-layer screen filter is also established and compared with the experimental data with good coincidence,which verifies the reliability of the mathematical model.During the validation of the powder layer resistance characteristics parameters,it is found that the Ergun model parameters could better fit the experimental resistance when the powder particle size is large(R p=125μm).However,with the decrease of the powder particle size,the difference between the resistance values obtained by the Ergun model parameters and the experimental values gradually increases,the model parameters should be further modified.When the fluid flows through the porous layer of the bed,the resistance pressure drop is mainly composed of the viscous and inertial components,which are changing with the inlet flow rate.The share of the viscous and inertial terms in the resistance pressure drop was calculated.Through the analysis of flow mechanism,it is found that the resistance of screen filter is mainly inertia resistance,which changes in parabola with the increase of equivalent Reynolds number.The bed powder resistance is mainly the viscous resistance,which varies linearly with the increase of equivalent Reynolds number.Brinkman mathematical model can better describe the physical variation law of fluid flow in different types of porous media,and can be used to analyze the variation law of viscous term and inertia term of porous media.
作者
丁卫东
占勤
杨洪广
连旭东
DING Weidong;ZHAN Qin;YANG Hongguang;LIAN Xudong(Reactor Engineering and Technology Research Institute,China Institute of Atomic Energy,Beijing 102413,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2023年第5期978-987,共10页
Atomic Energy Science and Technology
基金
国家重点研发计划(2017YFE0300305)。
关键词
径向床
多孔介质
压阻特性
数值模拟
radial adsorption bed
porous media
flow resistance characteristic
numerical simulation
