销钉机筒挤出机螺杆圆周展开面内物料流动与混合的数值分析与实验  

NUMERICAL AND EXPERIMENTAL ANALYSIS OF FLOW AND DISTRIBUTIVE MIXING IN UNFOLDED SURFACE OF SCREW IN PIN BARREL EXTRUDER

作　　者：魏新利[1] 董卫刚[1] 李培宁[2] 董其伍[1] 

机构地区：[1]郑州大学化工学院,河南郑州450002 [2]华东理工大学机械工程学院,上海200237

出　　处：《化工学报》2003年第11期1619-1626,共8页CIESC Journal

摘　　要：在一定简化条件下 ,对销钉机筒挤出机螺杆圆周展开面内的流场及分布混合效果以及销钉个数对流场和分布混合效果的影响进行了数值与实验研究 .提出了流场中某点混合效果、整个流场平均混合效果以及混合效果统计分布的数值计算与评价方法 .数值分析结果与实验结果具有较好的一致性 .结果表明 ,销钉及螺棱切槽对物料具有明显的强化流动与混合的作用 ;6个销钉结构模型混合效果好于 3个销钉结构模型 ,3个销钉结构模型好于有切槽无销钉结构模型 ,有切槽无销钉结构模型好于无切槽无销钉结构模型 ;有销钉结构较无销钉结构的平均混合效果提高 30 %～ 4 0 % ;有销钉结构随着时间的延长 ,混合效果不断提高 ,无销钉结构随着时间的延长 。Based on the reasonable simplified model of the pin barrel extruder, numerical and experimental analyses were carried out to investigate the flow field and distributive mixing effect on the unfolded surface of the screw. Meanwhile the influence of pins on flow and mixing effect was also discussed. A method of numerical analysis and evaluation of the mixing effect at a certain point, the average mixing effect and the statistical distribution of the mixing effect in the whole fluid field was developed. The numerical results were in good agreement with the experimental results. The following conclusions are obtained. First, the introduction of pins and slices into the screw flights can greatly improve the flow and mixing effect. Second, the unfolded surface of the screw with six pins has better mixing ability than the surface with three pins. The surface with three pins has better mixing ability than the surface with slices and without pins. The surface with slices and without pins has better mixing ability than the surface without slices and pins. Third, compared with the unfolded surface of the screw without slices and pins, the average mixing effect on the unfolded surface of the screw containing pins is increased by 30%-40%. Fourth, the mixing effect on the unfolded surface containing pins is continuously increased with time, but the mixing effect on the unfolded surface without pins can not be increased with time when the mixing effect reaches a certain value.

关 键 词：流场 混合 挤出机 销钉机筒挤出机 

分 类 号：TQ021.1[化学工程] TQ027.3