Abstract:

In order to study the influence of the inclined hole structure on hollow spindle on the properties of vortex spinning yarn, the 3-D model of twisting chamber was established by using CAD software-Solidworks and the computational fluid dynamics model was built by FLUENT15 software; the experiment simulated the flow field, studied the flow characteristic and obtained the distribution of pressure field and velocity field. Simulation results show that air is ejected from the jet orifice and pushed in a spiral manner, static pressure distributions in twisting chamber take on the U shape along nozzle radius; the negative pressure near the entrance of the hollow spindle is propitious to fibers being sucked into hollow spindle; the inclined hole on the outer surface of the hollow spindle is beneficial to increase the output of fibers’ axial velocity and effectively slow down the trend of axial velocity reduction; the angle of inclined hole will affect the axial velocity of fibers when they enter the twisting chamber, as the angle of inclined hole increases, the axial velocity increases first and then decreases; and the inclined hole can improve fibers’ twisting effect and ameliorate yarn properties.

Key words: air jet vortex spinning, hollow spindle structure, twisting chamber, mumerical simulation, flow field