摘要
^(220)Rn子体源箱是^(220)Rn室可靠调控的重要组成部分,对其进行优化设计是建立高水平^(220)Rn室的关键技术之一。本文在南华大学现有^(220)Rn子体源箱和前期研究的基础上,采用计算流体力学方法建立了^(220)Rn子体源箱数值模型,分析了入口流率、箱体轴向长度和换气率等对^(220)Rn子体源箱性能的影响,进行了性能模拟结果与实验对比,最后开展了源箱的优化分析。结果表明:模拟和实验所获得的规律一致,模拟结果与实验结果相对误差保持在11%以内;增大入口流率能有效改善源箱^(220)Rn子体的均匀性和稳定性,并增大源箱子体气溶胶的输出能力;当轴向长度一定时,入口流率均从1 L/min增加至10 L/min后,^(220)Rn子体气溶胶浓度达稳定状态的时间最大可缩短66.41%,^(220)Rn子体气溶胶活度输出率最大可增加20.25%,^(220)Rn子体源箱的均匀性先变差后变好,且在入口流率为4 L/min时均匀性最差;增加源箱轴向长度对^(220)Rn子体的均匀性和稳定性影响不明显,但能有效提高^(220)Rn子体气溶胶活度输出率;当入口空气流率设置为1~10 L/min且保持不变时,轴向长度从100 cm增至140 cm,^(220)Rn子体气溶胶浓度达稳定状态的时间变化不明显,^(220)Rn子体气溶胶活度输出率最大可增加48.51%,^(220)Rn子体源箱的均匀性先变差后变好。
The aging chamber is an important part of the reliable control of the^(220)Rn chamber,and its optimized design is one of the key technologies to establish a high-level^(220)Rn chamber.Based on the existing the aging chamber of University of South China and previous studies,this paper uses computational fluid dynamics to establish the aging chamber numerical model,and analyzes the effect of the inlet flow rate,the axial length of the aging chamber and the air exchange rate on the performance of the aging chamber.The performance simulation results were compared with experiments,and finally the optimization analysis of the aging chamber was carried out.The results show that:The laws obtained by simulation and experiment are consistent,and the relative error between simulation results and experimental results is kept within 11%;Increasing the inlet flow rate can effectively improve the uniformity and stability of the aging chamber,and increase aerosol activity output rate of the progeny of^(220)Rn of the aging chamber;When the axial length is constant,the inlet flow rate increases from 1 L/min to 10 L/min,and the time for the aerosol concentration of the progeny of^(220)Rn of the aging chamber to reach a steady state can be shortened by 66.41%at the maximum.The aerosol activity output rate of the progeny of^(220)Rn of the aging chamber can increase by 20.25%at the maximum.The uniformity of the aging chamber gets worse and then becomes better,and the uniformity is the worst when the inlet flow rate of the aging chamber is 4 L/min.Increasing the axial length of the aging chamber has little effect on the uniformity and stability of the the aging chamber,but it can effectively increase the aerosol activity output rate of the progeny of^(220)Rn of the aging chamber.When the inlet air flow rate of the aging chamber is set to 1-10 L/min and kept constant,and the axial length increases from 100 cm to 140 cm,the time for the aerosol concentration of the progeny of^(220)Rn to reach a steady state does not change significantly,and the aerosol activity output rate of the progeny of^(220)Rn can increase by 48.51%at the maximum.The uniformity of the aging chamber gets worse and then becomes better.
作者
胡少华
周青芝
李桂元
王倩
HU Shaohua;ZHOU Qingzhi;LI Guiyuan;WANG Qian(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2022年第9期1975-1986,共12页
Atomic Energy Science and Technology
基金
国家自然科学基金面上项目(1187051041)
湖南省研究生科研创新项目(CX20210944)
湖南省省级拨款科研课题(PC20K01)。
