鼓泡床内气固两相流的变尺度格子气模拟  

Simulation of Gas-Solid Two-Phase Flow in a Bubbling Fluidized Bed with Variable-Scale Lattice Gas Automata

作　　者：林亮成[1] 郑忠[1] 张晋[1] 陈伟[1] 李东耀[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]中国电力工程顾问集团东北电力设计院,长春130021

出　　处：《计算物理》2011年第5期705-712,共8页Chinese Journal of Computational Physics

基　　金：教育部留学回国人员科研启动基金项目(教外司留[2008]890-10)资助项目

摘　　要：基于格子气自动机的建模思想,建立气固两相流的变尺度格子气模型,用微观层次的气固作用规则描述两相流的宏观行为.二维流场空间被离散成两层不同尺度的正六边形网格,固体颗粒和气体粒子分别在各自的网格上运动;在格子气自动机基本规则基础上设计气固相作用规则和附加演化规则;确定模型宏观物理量的统计计算方法,并根据相似原理建立模型物理量与真实物理量之间的转换关系.用建立的模型对鼓泡床内气固流动行为进行模拟,通过比较发现,变尺度格子气模型的模拟结果与文献中的实验结果和双流体模型的模拟结果吻合较好,且平均相对误差更小,表明建模方法的正确性和模型的有效性.A variable-scale lattice gas automata model for gas-solid two-phase flow is established based on lattice gas automata （LGA） in which macroscopic behavior is described with microscopic gas-solid interactions. A two-dimensional flow field is divided into two-deck hexagon lattices with different scales, where solid particles and gas pseudo-particles are aligned in lattices for solid and gas respectively. In addition to basic LGA rules, collision and propagation rules are specifically designed for gas-solid systems, as well as additional evolution rules. A statistical method of macroscopic properties and conversion between model parameters and hydrodynamic properties based on similarity principle are established. Simulations of dynamic behaviors of gas-solid two-phase flow in a bubbling fluidized bed with this model show good agreement with experiments as well as simulation results with a two-fluid model. It has less average deviation, which validates the proposed model.

关 键 词：变尺度 格子气自动机 气固两相流 鼓泡床 模拟 

分 类 号：TQ018[化学工程] O359[理学—流体力学]