各向异性k-ε湍流模型在Rushton桨搅拌槽三维流场整体数值模拟中的应用  

NUMERICAL SIMULATION OF WHOLE THREE-DIMENSIONAL FLOW FIELD IN STIRRED TANK WITH ANISOTROPIC TURBULENCE MODEL

作　　者：孙海燕[1] 王卫京[1] 毛在砂[1] 

机构地区：[1]中国科学院过程工程研究所,北京100080

出　　处：《化工学报》2002年第11期1153-1159,共7页CIESC Journal

基　　金：国家自然科学基金资助项目 (No .2 9792 0 74)~~

摘　　要：根据搅拌槽内的流动呈各向异性的特点 ,引入适用于强旋转流场的各向异性k -ε湍流模型 ,用改进的内外迭代法对有挡板的Rushton桨搅拌槽进行了整体数值模拟 .利用文献中对搅拌槽内流场测定结果 ,给出了适用于Rushton桨搅拌槽的各向异性湍流黏度系数值 .模拟计算得到了搅拌槽内的流场分布和脉动速度分布 ,并同标准k -ε湍流模型计算结果及文献数据进行比较 .结果表明 ,各向异性k -ε湍流模型能成功反映Reynolds应力、湍流动能等湍流特征量 ,明显优于标准k -ε湍流模型 .In accordance with anisotropic feature of turbulent flow,an anisotropic k-ε turbulence model is used to predict the turbulent flow field and turbulent intensity generated by a Rushton disc turbine with the improved inner-outer iterative procedure considering the feature of flow swirl in the stirred tank.The predicted flow patterns are compared with experimental data and the simulation results with the standard k-ε turbulence model.The anisotropic k-ε turbulence model gives better prediction than the standard k-ε turbulence model.The predicted turbulent flow field is in agreement with to experimental data and the trend of the turbulence intensity can be effectively reflected in the simulation.

关 键 词：k-ε湍流模型 Rushton浆搅拌槽 三维流场 整体数值模拟 内外迭代法 

分 类 号：TQ051.72[化学工程] TQ0