大直径球罐内液体闪烁体和超纯水置换数值模拟  

Numerical Simulation of Displacement Process of Liquid Scintillator and Ultrapure Water in a Large Diameter Spherical Tank

作　　者：赵宏伟 董瑞 李俊杰[1,2] 欧阳峥嵘[4] 衡月昆 Zhao Hongwei;Dong Rui;Li Junjie;Ouyang Zhengrong;Heng Yuekun(University of Science and Technology of China,Hefei,230026,China;Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei,230031,China;The Fourth Research and Design Engineering Corporation of CNNC,Shijiazhuang,050021,China;ShanghaiTech University,Shanghai,201210,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学技术大学,合肥230026 [2]中国科学院合肥物质科学研究院,合肥230031 [3]中核第四研究设计工程有限公司,石家庄050021 [4]上海科技大学,上海201210 [5]中国科学院高能物理研究所,北京100049

出　　处：《核动力工程》2024年第2期225-230,共6页Nuclear Power Engineering

摘　　要：中微子实验装置一方面需要屏蔽大量的宇宙射线和来自岩石、空气、灰尘的天然放射性;另一方面需要尽可能降低实验设施自身的放射性本底。本文利用计算流体动力学(CFD)软件模拟研究了中心探测器(大直径球罐)内液体闪烁体(简称液闪)和超纯水的置换过程,分析水中的放射性杂质进入液闪的情况,研究自然对流对置换过程中液闪本底的影响。通过模拟无自然对流和有自然对流2种工况,得到2种工况下液闪和水的相态与流态分布以及相含量随时间的变化情况,提取出相界面处竖直向上速度,并计算得出截面向上总流量,以判断自然对流对置换过程的影响。结果表明:在有自然对流工况下液闪向上的平均体积流量是小于无自然对流状态的,可知自然对流可以抑制水中放射性杂质进入液闪。On the one hand,the Neutrino experimental facility needs to shield a lot of cosmic rays and natural radioactivity from rocks,air and dust.On the other hand,it is necessary to reduce the radioactive background of the experimental facility as much as possible.In this paper,the displacement process of liquid scinulator(liquid flash)and ultrapure water in the central detector(large-diameter spherical tank)is studied by CFD simulation.The situation of radioactive impurities in the water entering the liquid scinulator is analyzed,and the effect of natural convection on the liquid flash background during the displacement is studied.By simulating the two conditions of"no natural convection"and"with natural convection",the phase and flow distribution under the two different conditions was obtained,and the changes in the phase content with time are also obtained.The vertical upward velocity at the phase interface was extracted,and the total upward flow of the section was calculated to judge the influence of natural convection on the displacement process.The results show that the upward average volume flow of the liquid scintillator in the natural convection is less than that under the condition of no natural convection,which shows that natural convection can inhibit radioactive impurities from entering the liquid scintillator.

关 键 词：大直径球罐 计算流体动力学(CFD) 置换 自然对流 

分 类 号：TL334[核科学技术—核技术及应用]