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.
出处
《动力工程》
CSCD
北大核心
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)
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
power and mechanical engineering
circulating fluidized bed (CFB)
dense two-phase flow
clusters
numerical simulation
