Utilizations of Statistics on Optimizing Parameters in Compact Spinning with Pneumatic Groove

The compact spinning with pneumatic groove utilizes transverse air force and mechanical force of the pneumatic groove to condense fiber bundles to eliminate the spinning triangle.Range analysis and var...     

网眼罗拉型集聚纺集聚区须条集聚机理分析

为深入研究网眼罗拉型集聚纺系统中纤维须条在流场作用下的运动规律,建立了集聚区域的计算流体动力学(CFD)模型,并运用Fluent软件对该区域的流场进行数值计算,然后建立了纤维微元在气流场中的动力学模型,利用自编的Matlab程序对其进行求解,最后获得了纤维在集聚区的运动轨迹.研究结果表明不同初始位置的纤维运动轨迹能够反映须条的集聚规律;气流的横向作用力能够使须条在集聚方向上发生集聚;上层纤维较网眼罗拉表面的纤维集聚速度快;y轴向气流力使须条贴伏在网眼罗拉表面.     

Study on Airflow Field of Condensing Zone in Compact Spinning System with Perforated Drum

Negative pressure plays a very important role in compact spinning system. To know airflow field and its distribution is helpful to look into the condensing principle of fiber bundle. Therefore, computational fluid dynamics (CFD) software was used to simulate airflow field in this paper. Airflow velocity distributions both in different fiber layers and under different negative pressures were discussed. The results indicate that airflow velocity in upper layer of the fiber bundle is greater than that in lower layer.Airflow velocities in both X and Y axis directions have a positive correlation with negative pressure. It can provide a theoretical base to make high quality compact yarns in productive practice.     

气流槽聚型集聚纺纱系统集聚过程及机理分析

为了探讨气流槽聚型集聚纺纱系统的集聚过程和机理,首先分析了集聚过程的气流流动状况,然后利用Matlab模拟了须条在集聚气流场中的运动轨迹,并分析了气流对须条的集聚效果.研究结果表明:须条进入凹槽入口前,只受气流集聚作用,当进入凹槽后,受到气流集聚及凹槽形状集聚共同作用;气流对须条边缘纤维具有集聚作用,吸气负压大小影响气流对须条边缘纤维的集聚宽度;不同厚度须条的纤维受气流作用位置发生变化,在须条截面内发生内外转移现象.     

Characterizing and Analyzing the Airflow Field inside the Nozzle Block of Murata Vortex Spinning

A three-dimensional computational fluid dynamics model is developed by software Fluent 6.2, to simulate the flow field inside the nozzle block of the Murata vortex spinning. The flowing state and the distribution law of static pressure and velocity are characterized and analyzed. The relationship between the flowing state and the structure of the vortex spun yarn is also discussed. The research results can enhance the understanding of the yarn formation principle from viewpoint of the airflow field law inside the nozzle block of Murata vortex spinning.     

气流槽聚型集聚纺纱系统三维流场的数值研究

采用三维计算流体动力(3D CFD)技术建立了气流槽聚型集聚纺纱系统集聚区域的计算流体动力学模型,应用软件Fluent 6.3对集聚区域内流场进行了并行计算,表征了集聚区域流场的流动情况,解析了集聚区域内流场的静压分布及速度分布规律.研究结果表明气流槽聚型集聚系统的集聚原理由气流集聚与形状集聚组成;接近凹槽底部时静压及气流速度的波动幅度较大,其波动次数等于集聚区圆孔的数目;气流的X轴向分量对须条进行集聚,Y轴向分量利于须条滑入凹槽底部,从而对须条进行形状集聚.