三维CFD仿真软件GASFLOW气溶胶分析模块研发与应用  

Development and Application of Aerosol Analysis Module in 3D CFD Code GASFLOW

作　　者：王方年 肖建军 周志伟[2] WANG Fangnian;XIAO Jianjun;ZHOU Zhiwei(Karlsruhe Institute of Technology,Karlsruhe 76344,Germany;Tsinghua University,Beijing 100084,China)

机构地区：[1]卡尔斯鲁厄理工学院,德国卡尔斯鲁厄76344 [2]清华大学,北京100084

出　　处：《原子能科学技术》2023年第11期2138-2149,共12页Atomic Energy Science and Technology

基　　金：国家重点研发计划(2020YFB1901401)

摘　　要：反应堆严重事故下,放射性裂变产物以气溶胶的形式随水蒸气、氢气等一起大量释放至安全壳中。安全壳内气溶胶迁移与沉降受安全壳内热工水力深度影响。本文阐述了三维CFD仿真软件GASFLOW气溶胶分析模块研发方法,利用该方法实现了安全壳内气体相和气溶胶颗粒相的三维耦合仿真与并行计算,验证后的程序能准确评估气溶胶迁移、沉降及其在安全壳内的三维分布。大型先进压水堆典型事故序列下安全壳内气溶胶行为三维CFD分析表明:CFD计算时间可接受,具有较好工程实用性;气溶胶的沉积和积悬浮总量与系统程序结果吻合较好;气溶胶三维分布受气流场、浓度场、温度场影响;气溶胶吸湿增长是气溶胶自然去除的关键因素等。该软件模块可拓展至安全壳喷淋去除气溶胶、氢爆下气溶胶再悬浮等其他复杂热工水力工况下气溶胶行为研究。In the event of a severe nuclear reactor accident,the radioactive fission products in the form of aerosols will be released in large quantities into the containment along with steam,hydrogen,and other gases.The transport and deposition of aerosols in the nuclear containment are significantly influenced by the thermal-hydraulic conditions of the containment.The development approach of a three-dimensional computational fluid dynamics(CFD)code called GASFLOW is outlined,specifically tailored to analyze the thermal-hydraulics and behavior of aerosols in the containment during severe accidents.The Eulerian-Lagrangian approach enables the mass,momentum,and energy two-way coupling between the continuous gas and the dispersed particles.This approach is promising to model the behaviors of aerosols/droplets in 3D simulations of a full-scale nuclear containment.The particle group method is applied in the Lagrangian approach to track the particle trajectory.The ordinary differential equations,which couple the local heat and mass transfer between particles and the surrounding gas mixtures,are solved by the Runge-Kutta method.The GASFLOW aerosol analysis module is extensively validated by experiments,such as Gunn-Kinzer,Ranz-Marshall,CARAIDAS,and TOSQAN experiments,which respectively demonstrate good agreement with respect to each phenomenon:free-falling particles without heat and mass transfer,evaporation dynamics of an isolated stagnant droplet in dry air,the momentum and heat transfers of a single droplet under typical post-accident atmosphere conditions,and the gas mixing and depressurization in the containment by water spray.The validated program can accurately evaluate the three-dimensional distribution of aerosol transportation and deposition in the containment.The three-dimensional CFD analysis of aerosol behavior in the containment during a typical severe accident of a large advanced pressurized water reactor indicates that the CFD calculation time is acceptable and has good engineering practicality for large dry nucl

关 键 词：气溶胶 三维仿真 CFD 核电安全壳 安全壳热工水力 气溶胶自然去除 

分 类 号：TL364.4[核科学技术—核技术及应用]