基于DPM方法的安全壳内气溶胶输运特性初步研究  

A Preliminary Study on Aerosol Transport Characteristics in Containment Based on DPM Method

作　　者：王雨晴 翁炎运 倪木一 邓理邻[2] 谭怡[2] 张明昊 Wang Yuqing;Weng Yanyun;Ni Muyi;Deng Lilin;Tan Yi;Zhang Minghao(Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai,Guangdong,519082,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中山大学中法核工程与技术学院,广东珠海519082 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2024年第6期290-296,共7页Nuclear Power Engineering

基　　金：核反应堆系统设计技术重点实验室基金(HT-KFKT-24-2021008);南方海洋科学与工程广东省实验室(珠海)资助项目(SML2023SP224);广东省重点研发项目(2021B0101250002)。

摘　　要：核电厂在正常运行和发生严重事故时,气溶胶是放射性物质的主要泄漏途径。本文基于流体仿真软件FLUENT中欧拉-拉格朗日方法的离散相模型(DPM),针对铅基堆安全壳内气溶胶输运特性开展数值模拟研究。模拟结果显示静止流场中气溶胶小粒径颗粒受布朗力的驱动在不同壁面的沉降数量分布较均匀;大粒径颗粒受重力的驱动在不同壁面的沉降数量分布不均匀。同时,以PHEBUS FP T0实验的沉降阶段作为基准工况,验证了模型方法在安全壳环境下的适用性与准确性。最后,基于安全壳的二维轴对称简化模型,模拟了反应堆正常运行工况下从堆芯表面到安全壳中的气溶胶迁移和沉降过程。研究发现,在正常运行工况下,粒径0.1μm的气溶胶会随流线进行大范围的迁移并在安全壳上壁面和竖直壁面的交界附近被捕获,粒径3μm和10μm的气溶胶会滞留在安全壳下壁面附近或沉降到安全壳下壁面。基于本模型研究得到的初步结论,可为后续开展的气溶胶受力分析实验和安全壳内气溶胶迁移实验提供参考。Aerosols are the main leakage pathway of radioactive materials in nuclear power plants during normal operation and severe accidents.In this thesis,a numerical simulation study is carried out based on the Discrete Phase Model(DPM)of the Euler-Lagrange method in FLUENT for the aerosol transport characteristics in the containment of a lead-based reactor.The simulation results show that the number of aerosol small-size particles in the static flow field is uniformly distributed by Brownian force on different walls,and the number of large-size particles is unevenly distributed by gravity on different walls.Meanwhile,the applicability and accuracy of the modeling approach in the containment environment are verified by using the settling phase of the PHEBUS FPT0 experiment as a benchmark condition.Finally,based on a two-dimensional axisymmetric simplified model of a typical containment,the aerosol migration and settling processes from the core surface to the containment are simulated under the normal operating conditions of the reactor.It is found that under normal operating conditions,0.1μm aerosols will migrate widely with the flow line and be captured near the junction of the upper and vertical containment walls,while 3μm and 10μm aerosols will be retained near the lower containment wall or settle to the lower containment wall.The preliminary conclusions based on this modeling study can provide reference for the subsequent aerosol force analysis experiments and aerosol migration experiments in containment.

关 键 词：气溶胶 离散相模型(DPM) 安全壳 压水堆 铅基堆 

分 类 号：TL33[核科学技术—核技术及应用]