Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (09): 33-38.doi: 10.13475/j.fzxb.20191206806

• Textile Engineering • Previous Articles     Next Articles

Flow simulations of ring swirl nozzle under different inlet pressure conditions

CHU Xi1,2, QIU Hua1,2()   

  1. 1. Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
    2. College of Textile Science and Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2019-12-31 Revised:2020-06-05 Online:2020-09-15 Published:2020-09-25
  • Contact: QIU Hua E-mail:qiuhua@jiangnan.edu.cn

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Abstract:

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.

Key words: swirl nozzle, numerical simulation, hairiness, airflow field, STAR-CCM+, spinning

CLC Number: 

  • TS104.7

Fig.1

Structure diagram of swirl nozzle"

Fig.2

Volume grid diagram of swirl nozzle"

Fig.3

Trace diagram of airspeed in swirl nozzle"

Fig.4

Velocity trace at inlet (a) and exit (b) of swirl nozzle"

Fig.5

Velocity vector distribution in swirl nozzle"

Fig.6

Three dimensional velocity distribution of air flow on the axis of swirl nozzle"

Fig.7

Distribution of air pressure in xy plane"

Fig.8

Distribution of velocity in z direction(a) and y direction(b) of yz section"

Fig.9

Cloud chart of pressure field of yz section"

Fig.10

Pressure distribution on four straight lines under different pressure conditions. (a) Line a; (b) Line b; (c) Line c; (d) Line d"

Fig.11

Comparison of hairiness index between ring swirl spinning and ring spinning"

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