带导流筒连续式搅拌槽固液混合特性的CFD研究  

CFD Research for Solid-Liquid Mixing Characteristics of Continuous Stirred Tank with Draft Tube

作　　者：贾慧灵[1] 马占敏 赵静[1] 李梅[2] JIA Hui-ling;MA Zhan-min;ZHAO Jing;LI Mei(College of Mechanical Engineering,Inner Mongolia University of Sciences and Technology,Inner Mongolia Baotou014010,China;College of Material and Metallurgy,Inner Mongolia University of Sciences and Technology,Inner Mongolia Baotou014010,China)

机构地区：[1]内蒙古科技大学机械工程学院,内蒙古包头014010 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《机械设计与制造》2020年第2期10-13,共4页Machinery Design & Manufacture

基　　金：国家杰出青年基金项目（51025416）;内蒙古自治区高等学校科学技术研究项目（No.NJZY14169)

摘　　要：利用CFD方法对带导流筒连续式搅拌槽内的固液混合特性进行数值模拟,考察了导流筒位置、长度和直径,进料口的轴向位置和径向位置对浓度标准差(?滓)、混合时间(T)、单位体积搅拌功率(Pr)和湍动能(k)的影响。结果表明:随着导流筒位置的升高,?滓逐渐减小,T先增大后减小,Pr和k减小;随着导流筒高度的增加,?滓和T先减小后增大,Pr和k减小;随着导流筒直径的增大,?滓逐渐减小,T增大,Pr和k增大。随着进料口距液面距离的增大,?滓先减小后增大,T减小,Pr和k减小;随着进料口距搅拌轴中心距离的增大,?滓增大,T先增大后减小,Pr和k减小。?滓和T越小,Pr和k越大,混合越均匀。综合考虑各因素,导流筒位置为15 mm,筒高比为0.333,筒径比为0.567-0.6,进料口的轴向和径向距离分别为50 mm和15 mm时,固液混合性能最好。Solid-liquid mixing characteristics in the continuous stirred tank with draft tube were numerically simulated using CFD method.This paper investigated the effects of the position,length and diameter of the draft tube,and the axial and radial position of the inlet on the concentration standard deviation(?滓),mixed time(T),stirring power per unit volume(Pr)and turb-ulent kinetic energy(k).The research results show that with the increase of the draft tube position,the?滓decreased,the T in-creased first and then decreased,the Pr and k decreased.With the increase of the draft tube height,the?滓and T decreased first and then increased,the Pr and k decreased.With the increase of the draft tube diameter,the?滓decreased,the T increased,the Pr and k increased.With the increase of the distance of between inlet and liquid level,the?滓decreased first and then increased,the T decreased,the Pr and k decreased.With the increase of the distance of between inlet and stirring shaft,the?滓decreased,the T increased first and then decreased,the Pr and k decreased.The smaller the?滓and T,and the bigger the Prand k,the more homogeneous mixing.Taking into account various factors,solid-liquid mixing performance is the best when the position,height ratio,and diameter ratio of the draft tube are 15mm,0.333,and 0.567~0.6,respectively,and the axial and radial position of the inlet are 50mm and 15mm,respectively.

关 键 词：导流筒 连续式 搅拌槽 固液混合 计算流体力学 

分 类 号：TH16[机械工程—机械制造及自动化] O35[理学—流体力学]