四斜叶穿流式搅拌器固液悬浮特性数值模拟  

Numerical Simulation of Solid-liquid Suspension Performance with a Four-pitched-blade Punched Turbine

作　　者：陈建国[1] 栾德玉[1] 周慎杰[2] 陈颂英[2] 

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061 [2]山东大学机械工程学院,山东济南250061

出　　处：《石油化工设备》2011年第6期29-34,共6页Petro-Chemical Equipment

摘　　要：利用CFD FLUENT6.3软件,在直径为0.1m搅拌槽内对四斜叶穿流式搅拌器的固液悬浮特性进行研究。选用固相体积分数为15%、粒径250μm的玻璃球-水作为固液两相体系,计算域用四面体网格离散,采用标准k-ε及滑移网格法模拟液相流动,利用欧拉多相流模型模拟悬浮过程,分析了开孔孔径和开孔率对速度场、湍动能及搅拌功耗的影响。结果表明,在适宜的开孔孔径和开孔率范围内,穿流式搅拌器能够提高流体的湍动能及其耗散率,从而降低固液体系的临界悬浮转速。由于减少了桨叶在旋转方向上的投影面积,因此还可降低搅拌功耗。以开孔率12.4%、开孔直径d=1.Computational fluid dynamics （CFD） method was applied to the study of solid-liquid suspension performance in a stirred tank with diameter of 0. 1 m equipped with a four-pitchedblade punched turbine. The two-phase system studied consisted of globose glass beads and water. Solid particle volume fraction was 15%, and the particle diameter 250 μm. Standard turbulent model and sliding mesh method were used to simulate the liquid phase flow field, and the unsteady solid-liquid suspension process was simulated with the Eulerian multiphase model. The effects of two factors （aperture and porosity） on velocity field, turbulent kinetic energy and dissipation rate and power consumption were extensively analyzed. The results show that, at the better scope of aperture and porosity, the punched agitator can not only strengthen the level of turbulent kinetic energy and dissipation rate, lower critical suspension velocity of solid-liquid system accordingly, but also reduce the power consumption by diminishing the projection area in the direction which the paddles round. It is indicated that the punched agitator is a better configuration with porosity of 12.4% and aperture size of 1.3 mm.

关 键 词：穿流式搅拌器 固液悬浮 湍动能 数值模拟 

分 类 号：TQ027.2[化学工程]