计算流体动力学用于搅拌槽内对数螺旋导流板结构的优化  

Optimization of Design of Logarithmic Spiral Deflector in a Stirred Tank with CFD

作　　者：郝惠娣[1] 雷建勇[1] 马腾 秦佩[1] 冯荣荣[1] 杨斌[1] 

机构地区：[1]西北大学化工学院,陕西西安710069 [2]华陆工程科技有限责任公司,陕西西安710065

出　　处：《过程工程学报》2013年第6期921-925,共5页The Chinese Journal of Process Engineering

基　　金：陕西省科技厅工业攻关项目资助(编号:2011K10-21);陕西省教育厅科研项目资助(编号:11JK0619)

摘　　要：运用计算流体动力学方法对中心龙卷流型搅拌槽内部流场进行数值模拟,研究了对数螺旋导流板角度、极角角度、初始半径、导流板高度对搅拌槽内流场的影响,以优化设计用于生产纳米氧化镁的搅拌槽导流板结构.结果表明,对数螺旋导流板几何尺寸对宏观流场影响显著,当搅拌槽内径300 mm、桨叶为六直叶圆盘搅拌桨、对数螺旋导流板角度45°、极角角度60°、初始半径20 mm、导流板高度30 mm时,搅拌槽内整体流场形成2个循环流动,龙卷流效果明显,混合性能较好,并在纳米氧化镁制备实验研究中得到验证.The internal flow field characteristics in a central tornado flow stirred tank are simulated qualitatively based on the computational fluid dynamics, the effects of angle of logarithmic spiral deflector, degree of polar angle, initial radius and height of deflector on the flow field in the tank examined, and the deflector structure is optimized for production of nanometer magnesia with the tank. The results show that the dimensions of deflector have significant effect on the flow field. When the internal diameter of stirred tank is 300 mm, the six-straight-blade-disk turbine used, the angle of logarithmic spiral deflector 45~, the polar angle 60~, the initial radius 20 mm, and the height of deflector 30 mm, two circular flow patterns form, the effect of tornado flow is obvious and that of mixing better. Such optimization has been verified in the experimental preparation of nanometer magnesia.

关 键 词：中心龙卷流型搅拌槽 对数螺旋导流板 结构优化 数值模拟 氧化镁 

分 类 号：TQ027[化学工程]