不同压强条件下环锭旋流喷嘴内部流场模拟

为探究在不同环锭旋流喷嘴气道入口压强条件下喷嘴内部的流场分布规律,借助STAR-CCM+与ANSYS CFX流体分析软件建立旋流喷嘴模型并进行数值模拟分析,得到在纺纱过程中旋流喷嘴内部气流的速度和压力分布云图。结果表明:空气通入气道入口的流动机制遵循涡流效应,以旋流状向纱道两端流出,向两侧流出的旋流可对纱线进行轻微解捻和毛羽的进一步贴服;喷嘴内部流场对比示意图表明入口压强对纱线受力的分布并无影响,但气流压强波动幅度随入口压强的增大而增大,波动幅度越大越利于毛羽的包裹,对纤维束的包裹作用也更强烈,但过大的气流压强会造成更多纤维的流失。

Flow simulations of ring swirl nozzle under different inlet pressure conditions

In order to explore the distribution of flow field inside the swirl nozzle under different inlet pressure conditions, modeling and numerical simulation analysis of the nozzle were carried out by fluid analysis software STAR-CCM+ and ANSYS CFX. The velocity and pressure distribution cloud chart of the air flow in the swirl nozzle was obtained during spinning. The results show that the flow mechanism of the air through the inlet of the air passage follows the eddy current effect, and the airflow in the swirl shape flows out to both ends of the yarn passage, which slightly untwists the yarn and further reduces the hairiness. The comparison diagram of flow field inside the nozzle shows that the inlet pressure has no effect on the distribution of yarn stress, but the fluctuation amplitude of air pressure increases with inlet pressure is increased. The larger is the fluctuation amplitude, the more favorable it becomes for the wrapping of hairiness and the stronger is the wrapping effect on fiber bundles. However, it was found that the excessive air pressure will cause more fiber loss.