立式捏合机桨叶结构参数对混合釜流场影响的仿真分析

为揭示立式捏合机桨叶几何结构参数与混合釜流场之间的关系,以1 L两桨立式捏合机为研究对象,采用计算流体力学ANSYS Fluent 14.5软件对立式捏合机进行了三维模型仿真研究,分析了桨叶结构参数(桨桨间隙、桨叶螺旋角)的改变对混合物料挤压应力和剪切应力的影响。结果表明,增大桨桨间隙可减小桨叶对混合物料的挤压应力和剪切应力,空心桨螺旋角分别为40°、45°、50°,桨桨间隙由1.0 mm增加到3.0 mm,挤压应力、剪切应力分别平均减小了82.4%、57.23%;增大桨叶螺旋角可增大桨叶对混合物料的挤压应力和剪切应力,空心桨间隙分别为1.0、2.0 mm,桨叶螺旋角由35°增加到55°,挤压应力、剪切应力分别平均增加了92.8%、55.7%。

Numerical analysis on effects of geometrical parameters of blades on flow field in mixing tank of vertical planetary kneading mixers

In order to reveal the relationship between geometric parameters of blades and characteristics of flow field inside mix-ing tank, a double-blade vertical planetary kneading mixer was studied to analyze the effects of geometrical parameter of blades ( blade-blade clearance, helical angle) on extrusion and shear stress on mixing materials, of which the mixing volume was 1 L, via computational fluid dynamics software ANSYS Fluent 14.5. The results show that increasing blade-blade clearance can decrease ex-trusion and shear stress;when helical angle is 40°, 45°, and 50°, extrusion and shear stress decrease by 82.4% and 57.23% aver-agely along with the increment of blade-blade clearance from 1.0 mm to 3.0 mm, respectively. Increasing helical angle can increase extrusion and shear stress;when blade-blade clearance is 1.0 mm and 2.0 mm, extrusion and shear stress increase by 92.8% and 55.7% averagely along with the increment of helical angle from 35° to 55°, respectively.