浮动式反应堆事故多舱室三维流动对气溶胶重力沉降影响的数值模拟  

Simulation of the Effect of Three-dimensional Flow on Gravity Aerosol Deposition in the Floating Reactor Accident of Multi-cabins

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 of Shanxi 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904-915,共12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静态流场及三维流动情况下的气溶胶重力沉降进行仿真分析,可得到如下结论:多舱室的气溶胶输运受热工水力影响,在由堆舱输运至机舱时被水蒸气裹挟主要分布在机舱上部,不均匀性使机舱内重力去除效率逐渐增加。静态下的CFD重力沉降计算结果与集总参数法计算误差在20%之内,但静态下重力沉降高度不断下降,不能假设均匀分布。三维流场的湍流效应会增加重力沉降速率,对于大粒径颗粒来说,主导作用依然是重力沉降,然而小粒径颗粒的主导作用变为湍流沉积,同时沉降特征曲线由线性分布变为指数分布。Based on the computational fluid dynamics method,the aerosol gravity sedimentation of floating reactor break accident under the static flow field and three-dimensional flow conditions is simulated and analyzed.The following conclusions can be drawn:the aerosol transport in multiple compartments is affected by thermal hydraulics,and when transported from the reactor compartment to the engine room,it is mainly trapped by water vapor in the upper part of the engine room.The non-uniformity makes the gravity removal efficiency in the engine room gradually increase.The error between the CFD gravity settlement calculation results under static conditions and the lumped parameter method is within 20%,but the gravity settlement height continuously decreases under static conditions,and uniform distribution cannot be assumed.The turbulent effect of the three-dimensional flow field will increase the rate of gravitational sedimentation.For large size particles,the dominant role is still gravitational sedimentation,while the dominant role of small size particles becomes turbulent sedimentation.At the same time,the sedimentation characteristic curve changes from linear distribution to exponential distribution.

关 键 词：浮动式反应堆 计算流体力学 多舱室 重力沉降 三维流动 湍流沉积 

分 类 号：U664.156[交通运输工程—船舶及航道工程]