Numerical simulation of air flow structure inside nozzle of vortex spinning

A three-dimensional computational fluid dynamics model of the air flow structure inside the nozzle of vortex spinning is developed by Fluent software,and the influence of the number and orientation of inlet orifices,the gap between the spinning chamber and the hollow spindle,the strength of the negative pressure at the outlet of the gap,etc.on the flow structure and the yarn quality is investigated.The results show that when the flow is identical,the vortex strength and uniformity are determined by the number and orientation of inlet jet orifices and the gap between the spinning nozzle and the hollow spindle.Nearer the axial direction of inlet office to the cross-sectional direction of the spinning chamber and smaller the gap between spinning chamber and hollow spindle,stronger the vortex;and more the inlet jet orifices,more uniformity the vortex;and the strength of the negative pressure determines the flow axial speed which is governed by the variety and properties of yarns.