弧叶搅拌器不同桨叶直径下混合性能受转速和高度的影响程度分析OA北大核心CSTPCD

In order to explore the influence of rotational speed height and installation on the mixing performance of different impeller diameters,the Realizable k-ε turbulence model and the Euler multiphase flow model were used for numerical calculation.The mixing time,mixing energy per unit volume,power,solid particle distribution,turbulent kinetic energy and velocity flow field distribution of different impeller diameters at different installation heights and rotational speeds were compared and analyzed.The results showed that when the diameter of the impeller increased,the influence of the rotational speed on the mixing time and the movement of the solid particles decreased first and then increased,and the influence on the power,turbulent kinetic energy and medium flow rate increased,and there was no obvious effect on the mixing energy per unit volume.When the diameter of the impeller increases,the influence of the installation height on the mixing time and the movement of the solid particles decreased first,then increased and then decreased.When the diameter of the impeller was 400mm,the influence was the greatest,and there was no significant effect on the power,turbulent kinetic energy and medium flow rate.When the installation height was lower than H/3,the degree of influence of height on the mixing energy per unit volume increased and then decreased as the diameter of the mixing paddle increased,and conversely,the degree of influence of height on the mixing energy per unit volume increased.On the contrary,the influence of height on the mixing energy per unit volume increased.This study can explain the influence of the impeller diameter on the flow field to a certain extent when the design parameters changed.It could provide theoretical guidance for mechanical stirring and had certain engineering application significance.