Numerical simulation of swirling airflow dynamics in vortex spinning

Abstract

In this paper, a computational fluid dynamics model has been established and a three-dimensional numerical simulation of the flow characteristics of airflow in a vortex spinning nozzle has been carried out. A realizable k-ɛ model is used to simulate the turbulence of airflow in the nozzle. Unstructured tetrahedral grids which have good adaptability to complex boundaries are used in this paper to mesh the computational region. The computational model of the airflow field is solved and the characteristics of airflow in a vortex spinning nozzle are obtained. The results show that the flow principle of the airflow is determined by the pressure distribution of the airflow. The airflow field in the nozzle can be divided into external and internal areas, according to the flow characteristics and functions of airflow. The trajectory of swirling airflow from the jet orifices has a regular rotational motion within the twisting chamber, but the trajectory of swirling airflow from nozzle inlet is complex and backflow occurs; finally, these two strands of airflow are fused together as a regular rotational motion.