CIESC Journal

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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

孙海燕; 王卫京; 毛在砂   

  1. 中国科学院过程工程研究所
  • 出版日期:2002-11-25 发布日期:2002-11-25

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

SUN Haiyan;WANG Weijing;MAO Zaisha   

  • Online:2002-11-25 Published:2002-11-25

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 .

Abstract: 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.