基于计算流体动力学的改进型三斜叶-Rushton组合桨搅拌釜内流场研究

Study on Flow Field in the Stirred Tank of Improved Three-pitched Blade-Rushton Combination Impeller Based on Computational Fluid Dynamics

聚合反应过程中的搅拌操作直接影响聚合产物的质量。采用计算流体动力学技术对改进型三斜叶-Rushton组合桨搅拌釜内流场进行数值模拟,研究了不同转速下该组合桨搅拌釜内的流体速度分布和湍动能分布,并将其与三斜叶-Rushton组合桨进行对比研究。研究结果表明,与三斜叶-Rushton组合桨相比,改进型三斜叶-Rushton组合桨搅拌釜轴向高度z/H=0.205横截面的速度分布更有利于釜内流体的混合,转速100 r/min时搅拌釜内流体速度分布更合理;改进型三斜叶-Rushton组合桨桨叶间区域湍动能分布的连续性更好,轴向高度z/H=0.205横截面搅拌轴和搅拌釜内壁处的湍动能比三斜叶-Rushton组合桨的更高。研究结果可为改进型三斜叶-Rushton组合桨在聚合反应工业的应用提供参考。

The quality of the polymerization product is directly affected by the stirring operation during the polymerization reaction process.Numerical simulation of the flow field in the stirred tank of improved three-pitched blade-Rushton combination impeller was studied by computational fluid dynamics technology,velocity distribution and turbulent kinetic energy distribution in the stirred tank at different stirring speeds were studied,and the flow field of improved three-pitched blade-Rushton combination impeller was compared and studied with that of three-pitched blade-Rushton combination impeller.The results show that the velocity distribution at the axial height z/H=0.205 in the stirred tank shows that the improved three-pitched blade-Rushton combination impeller is more conducive to mixing in the stirred tank than three-pitched blade-Rushton combination impeller,when the rotation speed is 100 r/min,the velocity distribution in the stirred tank is more reasonably.The continuity of the turbulent kinetic energy distribution works well,and the turbulent kinetic energy of the stirring shaft and the inner wall of the stirred tank is better than three-pitched blade-Rushton combination impeller at the axial height z/H=0.205.The research results can provide a reference for the application of improved three-pitched blad-Rushton combination impeller in the polymerization reaction industry.