大颗粒流化床上升管内两相流动的数值模拟  

Numerical Simulations of the Two-phase Flow in a CFB Riser

作　　者：张少峰[1] 梁冀平[1] 刘燕[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《河北工业大学学报》2007年第5期39-44,共6页Journal of Hebei University of Technology

基　　金：河北省自然科学基金(202016)

摘　　要：以欧拉双流体模型和两相流体动力学理论为基础,采用湍流模型对上升管内固液两相流流化过程中两相速度分布、流场特性以及局部压力变化进行了模拟.结果表明管内颗粒存在非定型团聚现象,并对液固管流流场进行了分析.颗粒团聚及破散运动是导致管内局部压力波动和液相能量变化的主要原因.在同一条件下,模拟结果能够与实验结果较好地吻合,为进一步研究多相流化床和优化设计提供了有力的依据.CFD model of multiphase flow can be realized by the combination of Euler-Euler model and kinetic theory of multiphase flow, Based on these theories, modeling was used to simulate a liquid-solid flow, distributions of velocity and characteristic of two phase flow was calculated in a vertical pipe. The results show that clusters exist in the pipe and liquid-solid two phase flow was analysised. The main causation of the pressure fluctuation and energy dissipation were caused by the formation, movement and decomposition of the clusters. The results are in a good agreement with experimental data and provide theory direction for advanced research of multiphase flow fluidized bed.

关 键 词：数值模拟 流化床 大颗粒 计算流体力学 两相流 

分 类 号：TQ022.4[化学工程]