Numerical simulation and analysis of three dimensional flow field inside swirl nozzle based on STAR-CCM

To investigate the effect of air flow characteristic inside the swirl nozzle on the yarn surface,STAR-CCM + software was adopted to establish a fluid calculation model,and the air flow inside the swirl nozzle was numerically simulated and calculated. According to the calculation results,when the cross directions and tangent point positions of the nozzle airway and the yarn path were different,the velocity distribution rules of radial,tangential and axial air flows in the nozzle airway were analyzed and compared,and the action effect of airflow on yarns was analyzed in combination with the distribution characteristic of airflow in the yarn path. It was drawn from the simulation results that the tangency point of the yarn path and airway of the swirl nozzle along the X axis negative direction had a length of 14 mm,and when the cross direction of the nozzle airway and the yarn way are upwards,and the formed airflow is more conductive to the reduction of the majority of forward hairs.