网格尺度、时间步长和颗粒堆积率对射流床CFD模拟的影响

›› 2008, Vol. 8 ›› Issue (6): 1057-1063.

网格尺度、时间步长和颗粒堆积率对射流床CFD模拟的影响

裴培王其成张锴文东升

中国石油大学（北京）中国石油大学（北京）中国石油大学(北京) 伦敦大学玛利女王学院工程系

收稿日期:2008-07-08 修回日期:2008-10-07 出版日期:2008-12-20 发布日期:2008-12-20
通讯作者: 张锴

Effects of Grid Scale, Time Step and Maximum Solid Volume Fraction on CFD Simulation in a Jetting Fluidized Bed

PEI Pei WANG Qi-cheng ZHANG Kai WEN Dong-sheng

State Key Laboratory of Heavy Oil Processing, China University of Petroleum State Key Laboratory of Heavy Oil Processing, China University of Petroleum State Key Laboratory of Heavy Oil Processing, China University of Petroleum Department of Engineering, Queen Mary University of London, Mile End

Received:2008-07-08 Revised:2008-10-07 Online:2008-12-20 Published:2008-12-20
Contact: ZHANG Kai

摘要/Abstract

摘要： 采用欧拉-欧拉双流体模型，在CFX4.4软件上增加用户自定义子程序模拟了高2.0 m、宽0.3 m的二维射流床内空气和玻璃珠体系的流体动力学特性. 考察了网格尺度、最大颗粒堆积率和时间步长对射流的形成及发展过程、射流穿透深度及射流频率的影响，并与实验数据进行了对比. 结果表明，对于本研究的气固体系，当床层下部纵向网格数为100、时间步长0.0005 s时，不仅可以满足网格尺度和时间步长的无关性要求，而且模拟的射流穿透深度和射流频率与实验测量值的误差分别为5.7%和3.8%. 最大颗粒堆积率在本研究范围对模拟结果的影响可以忽略.

关键词: 时间步长, 最大颗粒堆积率, 气固射流床, 实验测量, 多相流计算流体动力学模型, 网格尺度

Abstract: Based on the Eulerian-Eulerian two-fluid model, the hydrodynamics was simulated in a two-dimensional jetting fluidized bed with 2.0 m height and 0.3 m width. Air and glass bead were chosen as gas and solid phases, respectively. The effects of grid scale, time step and maximum solid volume fraction on jetting parameters, such as jet revolution, jet penetration depth and jet frequency, were investigated numerically with CFX4.4 by adding User-defined Fortran subroutines. The computational results are independent of mesh size and time step for the gas-solid system used, when vertical grid number is 100 in the lower part of the bed and time increment 0.0005 s. The relative errors of simulated jet penetration depth and jet frequency with their corresponding experimental measurements are 5.7% and 3.8%, respectively. The influence of the maximum solid volume fraction on numerical data can be ignored in the range of this study.

Key words: time step, maximum solid volume fraction, jetting fluidized bed, experimental measurement, computational fluid dynamics simulation, grid scale

中图分类号:

TQ018

裴培王其成张锴文东升. 网格尺度、时间步长和颗粒堆积率对射流床CFD模拟的影响[J]. , 2008, 8(6): 1057-1063.

PEI Pei WANG Qi-cheng ZHANG Kai WEN Dong-sheng. Effects of Grid Scale, Time Step and Maximum Solid Volume Fraction on CFD Simulation in a Jetting Fluidized Bed[J]. , 2008, 8(6): 1057-1063.