Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (10): 56-61.doi: 10.13475/j.fzxb.20180908906

• Textile Engineering • Previous Articles     Next Articles

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

QIAN Cheng, LIU Yanqing(), LIU Xinjin, XIE Chunping, XU Bojun   

  1. Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2018-09-30 Revised:2019-05-28 Online:2019-10-15 Published:2019-10-23
  • Contact: LIU Yanqing E-mail:yqljndx@126.com

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Abstract:

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.

Key words: spinning frame, four-roller compact spinning, flow field simulation, compacting device

CLC Number: 

  • TS101.2

Fig.1

Four-roller spinning drafting system"

Fig.2

Four-rollers compact area"

Fig.3

Label of suction sunken(Line 1-5)"

Fig.4

Airflow velocity profile"

Fig.5

Flow speed vector illustration of compact area. (a)Inlet surface of suction sunken; (b)Profile of suction sunken"

Fig.6

Static pressure distributions in different position of suction sunken"

Fig.7

Static pressure distributions up different areas of Line4"

Fig.8

Component velocity distributions in suction sunken(pressure_outlet). (a)X axial;(b)Y axial;(c)Z axial"

Fig.9

Component velocity distributions of the Line5. (a)X axial;(b)Y axial;(c)Z axial"

Tab.1

Test results of yarn properties"

编号 负压值/Pa 气流速度/(m·s-1) 强力/cN 断裂伸长率/% 3 mm以下毛羽根数 条干CV值/% 捻度/(捻·(10 cm)-1)
1 -2 800 69.8 417.2 8.19 10 421 10.44 103.2
2 -3 000 74.6 425.7 7.73 9 918 10.63 104.6
3 -3 200 79.5 428.1 7.62 9 623 10.83 105.0
4 -3 400 85.3 469.1 7.59 8 921 10.94 106.5
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