均匀布风鼓泡床内流体动力特性数值模拟研究

Numerical Study on Hydrodynamics of a Freely Bubbling Fluidized Bed

基于欧拉-欧拉双流体模型,数值模拟研究了底部均匀布风鼓泡流化床内气固两相流体动力特性。鼓泡床底部分别采用均匀进风和脉动项按正态分布的脉动进风速度边界条件,分别考察了不同进口边界条件对鼓泡床内气固两相流体动力特性的影响。模拟结果显示,采用脉动项按正态分布的脉动进风速度边界条件时,气体能够充分地与固体颗粒发生相互作用,表明在数值模拟中边界条件设置时考虑速度脉动可以更合理地预测床内气固两相流动特性。

Euler-Euler two-fluid model is used to numerically investigate the flow dynamics of gas-solid two-phase flow in a freely bubbling fluidized bed. Steady velocity inlet boundary condition and fluctuating distribution velocity inlet boundary conditions with normal distribution item are introduced to simulate the process of two-phase flow patterns in the bubbling fluidized bed. Numerical results indicate that when fluctuating inlet boundary condition is applied, gas can fully interact with solid phase. It is more reasonable to forecast the gas-solid two-phase characteristics with this kind of inlet boundary in the simulation.