搅拌反应器流场的数值模拟  

Numerical Simulation of Flow Field in a Stirred Reactor

作　　者：魏新利[1] 任杰[1] 王定标[1] 孟祥睿[1] 

机构地区：[1]郑州大学化工学院,河南郑州450002

出　　处：《郑州大学学报（工学版）》2006年第2期52-55,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省自然科学基金资助项目(004031500);国家"211工程"重点学科建设资助项目

摘　　要：使用数值模拟的方法研究了一种搅拌反应器的流场特点,采用k-ε两方程湍流模型分析流场,采用多重参考系法处理搅拌桨区域.结果显示:改进的弧形叶桨形成的流场具有典型的径向流特点,而且轴向流动有所加强;标准k-ε模型和RNG k-ε模型均能较准确地预测搅拌槽内轴向的最大速率,但RNG k-ε模型所得结果更为准确;搅拌槽内的湍流能量主要产生于桨叶周边区域和槽近壁区域;但是桨叶下方区域受循环流动的影响比较弱,而且k值比较小,应该使桨叶更接近槽底部,或者采用带45°倾角的折叶桨,从而加强桨叶的轴向输送能力,改善混合效果.The flow field feature in a stirred reactor has been studied by numerical simulation. This study uses k - ε Two- Equation turbulent model, and disposes the area around stirring impeller with multi - reference frame method. As the results show, the flow field generated by the improved arc blade impeller has typical radial flow feature, and the axial flow has been enhanced. The turbulent model of Standard k - ε and RNG k - ε both can accurately predict axial maximum velocity in stirred tank, and the outcome of RNG k - ε model is more accurate. The turbulent energy in stirred tank is mainly generated in the area around er and near tank wall. But the area under stirring impeller is influenced by circular flow more weakly, and the parameter k is smaller. So the stirring impeller should be located more near towards the bottom of stirred tank, or should use folding blade impeller with 45 degree pitch angle, in order to enhance the axial delivering capability of stirring impeller and improve the mixing effect.

关 键 词：数值模拟 搅拌反应器 湍流模型 多重参考系法 

分 类 号：TQ051.8[化学工程]