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利用FLUENT软件对不同桨径比下立式三轴搅拌釜内单相和固-液两相混合过程分别进行三维数值模拟,对流场分析可知增大桨径比能改善立式三轴搅拌釜内流场的结构。利用修正速度判据得出不同桨径比下搅拌釜的临界悬浮转速,并通过计算临界悬浮转速下的搅拌功率,初步得出立式三轴搅拌釜桨径比的最佳取值范围在0.1～0.125之间。
The three-dimensional numerical simulation of single-phase and solid-liquid two-phase mixing process in vertical three-axis stirred tank with different propeller diameters was carried out by using FLUENT software. The analysis of the flow field shows that increasing the ratio of the propeller shaft can improve the vertical three- Internal flow field structure. The critical suspension speed of the stirred tank under different propeller diameters was obtained by using the modified velocity criterion. The optimum range of the vertical three-shaft stirred tank propeller diameter ratio was obtained by calculating the stirring power at the critical suspension speed. ~ 0.125 between.