四罗拉紧密纺气流导向装置应用研究

Application research of airflow guiding device in four-roller compact spinning system

采用Fluent软件对带有气流导向装置的四罗拉紧密纺系统集聚区流场进行数值仿真模拟,得到气流导向装置在不同安装位置下集聚区内的气流动动规律,为该系统气流导向装置的优化设计提供了理论依据。研究表明:加装气流导向装置后,集聚区的负压作用区域明显增大,有利于须条的横向聚集,可有效防止单纤维扩散而不集聚到纱体中,保证了各纤维以平行的状态实现完美聚集;不同气流导向装置位置下的集聚区的流速分布不同,在合适的高度范围内,气流导向装置位置越低,须条集聚方向风速越大,须条输出方向风速越小,须条厚度方向风速略微减小。低位置的气流导向装置更适合纺制线密度较小的纱线,高位置则更适合纺线密度较大的纱线。通过实验对模拟结果进行了验证。

In this paper, the numerical studies of three-dimensional flow field in four-roller compact spinning with airflow guiding device are investigated by using Fluent Software. The laws of airflow in fiber-converying zone are given with three different installation position of airflow guiding device, which provides a theoretical support for product development and optimal design of four-roller compact spinning system. It is shown that the effective range of negative pressure in four-roller compact spinning with guiding device enlarges significantly and negative pressure use efficiency improves correspondingly, which is benefit for improving fiber compacting effect, and prevents dispersion of fiber strands. It is also show that flow velocity distribution is different under different airflow guide device installation positions. In the appropriate height range, the smaller of distance between guiding device and lattice apron, the larger of flow velocity on fiber strand transverse converying direction, the smaller of flow velocity on fiber strand output direction. The small distance is suitable for yarn spinning with low linear density; the large distance is suitable for yarn spinning with high linear density. Finally, the theoretrical results obtained are illustrated by experiments.