基于Ansys/Fluent软件对速分球曝气生物滤池内一组速分球的气液两相流动进行三维数值模拟,模拟采用双流体的Mixture模型和多孔介质的渗流模型.模拟获得速分球生物滤池系统中速分球内基质的不同孔隙率对速分流场的影响,以及渗流对基质内部流场的影响.根据模拟结果对比分析基于渗流理论的不同孔隙率的多孔介质对气液两相速分流场速度场的影响,以确定最适合微生物生长的基质孔隙率.研究表明,速分球基质孔隙率为0.6时,最适合生物膜的生长.%Based on Ansys/Fluent software, three-dimensional numerical simulation of gas-liquid two phase flow in a group of velocity discrete spheres in biological aerated filter was carried out. The Mixture model of two-fluid and the seepage model of porous media were adopted.The influence of different porosity of the matrix in the velocity discrete biofilter on the velocity discrete flow field and the influence of seepage on the internal flow field of the matrix were determined through the simulation. According to the simulation results, the influence of porous media with different porosity based on seepage theory on the velocity field of the gas-liquid two phase velocity discrete flow field were compared and analyzed to determine the porosity of the matrix which is most suitable for microbial growth. The results of the study showed that, porosity of the velocity discrete sphere was selected to be 0.6,for it is the most suitable value for the biofilm growth.
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