Flow Simulations of Swirl Nozzle Under Different Inlet Pressure Conditions

To explore the distribution of flow field inside the swirl nozzle under different inlet pressure conditions, the model and numerical simulation analysis of the nozzle are carried out by fluid analysis softwares named STAR-CCM+ and ANSYS CFX, and the cloud chart of velocity and pressure distribution in the swirl nozzle during spinning is obtained. The results show that the flow mechanism of air into the swirl nozzle through inlet follows the vortex flow effect, and the swirling flow to both sides can slightly untwist the yarn and further paste the hairiness. The flow field inside the nozzle under different inlet pressure conditions was obtained. It is concluded that the inlet pressure has no effect on the distribution of yarn stress, but the fluctuation amplitude of air pressure increases with the increase of inlet pressure. The larger the fluctuation amplitude is, the better the fuzzy yarn is wrapped, but the excessive air pressure will cause more fiber loss.