稠密气固两相流动过程模拟的改进模型与应用  

Improved Model of Dense Gas-Particle Two-Phase Flow

作　　者：刘向军[1] 徐旭常[2] 

机构地区：[1]北京科技大学热能系,北京100083 [2]清华大学煤的清洁燃烧技术国家重点实验室,北京100084

出　　处：《动力工程》2004年第2期234-239,共6页Power Engineering

基　　金：国家重点基础研究专项经费资助(No.G1999022208-8)

摘　　要：提出了模拟稠密气固两相流动的改进模型。湍流流场采用改进的k-ε-εe模型,颗粒的聚合效应采用聚合力的当量直径折算模型计算。将颗粒团作为离散相,研究颗粒团的运动、碰撞、破碎与合并。应用上述模型数值模拟了循环流化床内的稠密气固两相流动。得到了床内气相速度、颗粒团分布、颗粒浓度分布及颗粒团大小分布等详细两相流场信息。计算结果合理,与前人实验结果相符。模拟结果详细揭示了循环流化床内稠密气固两相流动的基本特征。Improved models regarding dense gas-particle two-phase flow are proposed. The two-phase turbulent flow is studied by k-ε-ε_e model. The impact of particle clustering is calculated by equivalent-diameter-converting model. The cluster motion, collision, break-up and reforming models are then obtained by treating particle cluster as one discrete phase. Reasonable results on cluster structure, cluster size, bed vodiage, gas velocity, and particle velocity in a circulating fluidized bed (CFB) are obtained. These results are in good agreement with experiment ones, and present the characteristics of dense two-phase flow in a CFB detailedly. Figs8,tables2 and refs 8.

关 键 词：动力机械工程 循环流化床 稠密气固两相流动 颗粒团 数值模拟 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]