放射性粉末物料洒落事故气溶胶分布特性CFD研究  

CFD study on aerosol distribution characteristics of radioactivepowder material scattering accident

作　　者：陈佳辰 王彦[1] 廉冰[1] 杨洁[1] 岳琪 蒙滨驰 CHEN Jiachen;WANG Yan;LIAN Bing;YANG Jie;YUE Qi;MENG Binchi(China Institute for Radiation Protection,Taiyuan 030006)

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《辐射防护》2024年第5期562-572,共11页Radiation Protection

摘　　要：基于CFD方法,研究密闭厂房内发生放射性粉末物料洒落事故后室内空气流动以及颗粒运动情况,并分析了颗粒粒径、洒落速度、洒落高度的影响。结果表明:颗粒运动主要受密闭空间内部气体环流的影响,大部分颗粒沉积到地面或附着于壁面而被捕捉,少部分颗粒后期将在室内飘散悬浮,随气流运动;不同洒落速度造成的气溶胶运动及分布情况区别很小;小粒径颗粒更容易受周围气体的曳力影响而从主流区域脱离出来形成散射粉尘,因此,颗粒粒径越小,洒落后造成的沉积范围越大。Based on CFD method,this paper studied the indoor air flow and particle movement after the radioactive powder material scattering accident in a closed workshop,and analyzed the influence of particle size,scattering speed and scattering height.The results show that the particle movement is mainly affected by the gas circulation inside the confined space.Most of the particles are deposited on the ground or attached to the wall and captured,and a small part of the particles will be floating and suspended indoors in the later period and move with the airflow.There is little difference in aerosol motion and distribution caused by different scattering velocities.Particles with small particle size are more likely to be separated from the mainstream area and form scattered dust under the influence of the drag force of the surrounding gas.Therefore,the smaller the particle size is,the larger the deposition range caused by the spraying lag is.

关 键 词：CFD方法 洒落事故 气溶胶颗粒 

分 类 号：X591[环境科学与工程—环境工程]