Three-dimensional flow field analysis of a progressively accelerating single screw with kneading blocks

Abstract

Objective: In order to improve the mixing performance and work speed of a single screw extruder increase. Methods: A coaxial gradual acceleration single screw using planetary wheel assemblies and mixing elements was designed. Using ansys/cfx to conduct the three-dimensional flow field analysis of the flow channel, the macro pressure field, speed vector diagram, speed streaming diagram and axial speed changes, were finished, which was compared to the only traditional pillar. Results: As the speed of the pillar continues to increase, the time for the material to stay in the barrel becomes shorter, and the extrusion efficiency of the gradual acceleration screw can be improved by 20% to 25%, so that the energy consumption is greatly reduced, due to the presence of the kneading block, the material is repeatedly squeezed at the kneading block, so that the gradual acceleration of the single screw in the increase in production capacity at the same time the mixing performance can be guaranteed. Conclusion: The coaxial gradual acceleration of the single screw high-speed rotation of the kneading block can make the material mix more fully, and can shorten the residence time of the material in the screw, improve the output.

Keywords

• single screw extruder
• three-dimensional flow field
• kneading block
• planetary wheel assembly