基于MFIX开源程序下的气固两相流动特性的数值模拟  

Numerical Simulation of Gas-Solid Two-phase Flow Based on MFIX

作　　者：杨建蒙[1] 李斌[1] 王洪远 侯党员 YANG Jianmeng;LI Bin;WANG Hongyuan;HOU Dang yuan(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《动力工程学报》2020年第7期564-570,共7页Journal of Chinese Society of Power Engineering

摘　　要：基于MFIX开源程序建立了三维喷动床内气固两相流动模型,利用MFIX-离散单元法(DEM)模型对源程序进行不同曳力模型的数值模拟计算,得到颗粒在三维喷动床内的流动特性,同时结合实验对喷动床内0.2~2.0 s内的颗粒流动特性进行了分析。结果表明:数值模拟与实验结果相似度较高,Gidaspow模型床高与实验结果较接近,但该模型床高波动范围较大,而Syamlal-O’Brien模型相对较为接近实验结果;2种曳力模型下model B比model A的死区范围小,采用model B流动性更强;随着时间的推移,床高会出现一个极值点,在此点前后床高波动较大, model B的床高极值点比model A的高,且Syamlal-O’Brien模型比Gidaspow模型出现床高极值的时间点往后推移。Based on the open source program MFIX, a three-dimensional model was established for the gas-solid two-phase flow in a spouted bed, and subsequently numerical simulations were conducted for the source program with different drag models using MFIX-DEM method to obtain the flow characteristics of particles in the three-dimensional spouted bed. At the same time, the flow characteristics of particles in the spouted bed were analyzed within 0.2-2.0 s through experiments. Results show that the numerical simulations agree well with the experiments. The bed height of Gidaspow model is close to the experimental results, but the fluctuation range of the bed height of Gidaspow model is larger, while that of Syamlal-O’Brien model is relatively close to the experimental results. The dead area of model B is smaller than model A under two drag models, and the flow ability in model B is stronger. As time goes on, there will be an extreme point of bed height, before and after this point, the bed height fluctuates greatly;the extreme point of bed height in model B is higher than in model A, and the time point when the extreme value appears in Syamlal-O’Brien model is later than in Gidaspow model.

关 键 词：气固两相流动 MFIX-DEM 曳力模型 床高 数值模拟 

分 类 号：O35[理学—流体力学]