浮动式反应堆事故多舱室气溶胶扩散泳沉积与三维流动的耦合数值模拟  

Coupled Numerical Simulation of Aerosol Diffusion Deposition and Three Dimensional Flow in Multi-cabin of Floating Reactor Accidents

作　　者：刘哲 杨亚鹏[1,2] 冯宗洋 李国强[1,2] LIU Zhe;YANG Yapeng;FENG Zongyang;LI Guoqiang(China Institute for radiation protection,Taiyuan of Shanxi Prov.030006,China;China Institute for radiation protection,CNNC Key Laboratory for Radiation Protection Technology,Taiyuan Prov.030006,China)

机构地区：[1]中国辐射防护研究院核应急与核安全研究所,山西太原030000 [2]中国辐射防护研究院中核辐射防护技术重点实验室,山西太原030000

出　　处：《核科学与工程》2024年第4期929-941,共13页Nuclear Science and Engineering

摘　　要：基于计算流体力学方法对浮动式反应堆破口事故在壁面冷却条件下水蒸气冷凝及壁面冷凝引起的气溶胶扩散泳沉降进行仿真分析,并与静态条件下气溶胶扩散泳沉积对比,发现:所采取的冷凝模型经实验对比能很好地预测水蒸气冷凝;静态条件下气溶胶扩散泳沉积速度与气溶胶粒径几乎无关,与集总参数法的规律一致,此外湍流沉积会使气溶胶衰减因子增大约3×10^(-4)。非均匀流场在冷凝环境下会产生大范围的回转流动。气流曳力会使衰减因子产生量级上的增加,同时曳力作用对于气溶胶粒径不敏感;冷凝使堆舱出现很大的湍流强度,会增强扩散泳的沉积效果,增强效果对小粒径颗粒更明显,使1μm颗粒衰减因子明显大于堆舱中的10μm颗粒衰减因子,最大可达0.035。Based on the computational fluid dynamics method,the simulation analysis of water vapor condensation and aerosol diffusion migration sedimentation caused by wall condensation in the floating reactor break accident under the condition of wall cooling was carried out.Under static conditions,the deposition rate of aerosol diffusion is almost independent of the particle size of the aerosol,which is consistent with the law of the lumped parameter method.In addition,turbulent deposition increases the aerosol attenuation factor by about 3×10-4.Non uniform flow fields can generate large-scale rotational flow in condensing environments.The drag force of the airflow will increase the attenuation factor on an order of magnitude,and the drag effect is not sensitive to the particle size of the aerosol.Condensation causes significant turbulence intensity in the reactor compartment,which enhances the sedimentation effect of diffusion swimming.The enhancement effect is more pronounced for small particle sizes,resulting in the attenuation factor of 1μm particles is significantly greater than the 10μm particles in the reactor compartment,with a maximum of 0.035.

关 键 词：浮动式反应堆 计算流体力学 多舱室 水蒸气冷凝 扩散泳 三维流动 

分 类 号：U664.156[交通运输工程—船舶及航道工程]