四罗拉集聚纺纱系统三维流场模拟与分析

为探究四罗拉集聚纺纱系统集聚区域负压气流对须条集聚效果的影响,使用ICEM CFD软件创建了四罗拉集聚纺纱系统集聚区域的流体动力学模型,采用ANSYS Fluent Release 16.0软件对集聚区域的流场情况进行数值计算,表征了集聚区域的气流分布情况,给出了速度分布规律的数值表征,最后设置不同压强的集聚区负压来纺制纱线进行测试研究。结果表明:吸风槽6°的斜度没有对入口处的横向静压产生影响,吸风槽横向的静压成“U”型分布;不同轴向的速度分量对须条的作用效果不同;横向聚集方向气流对须条有加捻的作用;吸风槽负压增大时,纱线的强力增大,断裂伸长降低,毛羽减少,条干不匀率增加。

Simulation and analysis of three-dimensional flow field in four-roller compact spinning system

In order to investigate the compacting effect produced by airflow in four-roller compact spinning, the fluid dynamics model which is in the compact region of the four-roller compact spinning system was established by using ICEM CFD software. The software ANSYS Fluent Release 16.0 was adopted to calculate the flow field and characterize the airflow distribution in the compact region. The distribution of flow field and the velocity distribution rule in the compact region were also characterized. Finally different pressures in the compact region was arranged to spin yarn for testing. The results show that the slope of 6 degrees of the compact region has no effect on the horizontal static pressure at the inlet. The horizontal static pressure of the compact region is U-shaped. The effects of velocity components of different axial directions on the fiber bundles are different, and the airflow of lateral compacting direction also can twist the fiber bundles. As the static pressure increases, the breaking strength and evenness of composite yarn increase, while the breaking elongation and hairiness of composite yarn decrease.