介绍了核空气净化系统过滤器小室流场模拟的基本方法 ,其中过滤器用多孔介质模拟 ,并简单介绍了多孔介质流体流动的基本特性和运动方程。对于模拟过程中所采用的参数和方法的选择给予分析比较 ,从而得到了比较符合实际气流分布的紊流模型、多孔介质参数 C,并利用该方法分析了有 3台过滤器的小室不同长度下的气流均匀性 ,小室长度越长 ,气流不均匀度越小 ,气流越均匀 ,并得出了符合气流均匀性要求的小室最小长度 The basic method for simulating the flow field in the filter cell of nuclear air purification system is introduced. The filter is simulated by porous media and the basic characteristics and equations of motion of porous media fluid are briefly introduced. The selection of parameters and methods used in the simulation process is analyzed and compared to obtain a turbulence model that is more in line with the actual airflow distribution and the parameter C of the porous medium. By using this method, Of the airflow uniformity, the longer the length of the cell, the smaller the airflow unevenness, the more uniform the airflow, and reached the minimum length of the chamber in line with the uniformity requirements of the airflow