运用CFD模拟高效牵伸装置的气流特征

Characterization of airflow in high-performance drafting systems using CFD simulation

现代新型纺纱工艺的发展,要求提高前道牵伸的速度。喷气纺纱中高效牵伸装置的生产速度可达450 m/min。新型纺纱工艺代替传统纺纱,要求新的纺纱系统必须具有足够的加工稳定性。由于前罗拉的高速旋转,牵伸装置产生的气流场可能对牵伸装置中的纤维通道产生反作用,进而影响成纱质量。德国亚琛工业大学纺织技术研究所(ITA)采用流体仿真模拟方法表征罗拉输出的气流。通过检测不同的生产速度来研究其对牵伸装置中气流的影响。

The development of today's alternative spinning processes requires an increase in the speed of the upstream drafting. In particular,high-performance drafting equipment is used in air-jet spinning and can achieve production speeds of up to 450 m /min. In order to establish these new spinning processes as an alternative to conventional spinning processes,the new system must have sufficient process stability. Due to the high speeds of the front rollers,the drafting system generates air currents that may have a negative influence on the fiber transport in the drafting system and thus on the yarn quality. At the ITA,Aachen /Germany,the air currents produced by the output of the high-performance rollers were characterized by means of flow simulation. Various production speeds were examined to investigate their influence on the airflow in drafting units.