Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (03): 168-175.doi: 10.13475/j.fzxb.20210203109

• Machinery & Accessories • Previous Articles     Next Articles

Effect of yarn's initial position on yarn tucked-in in pneumatic tucked-in selvedge apparatus

LIU Yisheng1(), ZHOU Xinlei1, LIU Dandan2,3   

  1. 1. School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou, Zhejiang 310027, China
    3. Academia Sinica, United Science & Technology Co., Ltd., Hangzhou, Zhejiang 310051, China
  • Received:2021-02-15 Revised:2021-06-22 Online:2022-03-15 Published:2022-03-29

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Abstract:

In order to improve the structural design of the pneumatic tucked-in selvedge apparatus and increase the yarn tucked-in efficiency and stability, a combination of numerical simulation and experiment is used to explore the mechanism of the yarn's initial position on the yarn tucked-in. Based on the one-way weak fluid-structure interaction algorithm, a numerical model suitable for simulating the behavior of a yarn from oblique-blowing to tucked-in is proposed and the movement of a single yarn with one end fixed and the other free end in different initial positions being subjected to oblique-blowing and tucked-in sequence is explored. A visual experimental bench was built to record the movement of the yarn through a high-speed camera. By comparing the results of numerical simulation with experimental data, the accuracy of the one-way weak fluid-structure interaction algorithm is verified. The results show that: the time and the elongation of the yarn tucked-in are related to its initial position, and the tucked-in effect of the yarn is related to its initial ordinate. The yarns in different initial positions can all tucked-in within 7.425 ms.

Key words: pneumatic tucked-in selvedge apparatus, oblique-blowing, yarn tucked-in, folding-in airflow, fluid-structure interaction, numerical simulation

CLC Number: 

  • TS183.92

Fig.1

Tucked-in and oblique-blowing three-dimensional airflow field fluid model"

Fig.2

Working principle diagram of visual experiment bench"

Fig.3

Schematic diagram of ducts"

Fig.4

Contours of velocity and pressure of flow field. (a) Oblique-blowing airflow field; (b) Folding-in airflow field"

Fig.5

Diagram of velocity and pressure for displacement. (a) Oblique-blowing airflow field; (b) Folding-in airflow field"

Fig.6

Oblique-blowing movement state of yarn at different time steps in airflow field. (a) Group A; (b) Group B; (c) Group C; (d) Group D; (e) Group E"

Tab.1

Elongation of yarn and aerodynamic force of beam element node whose X coordinate is 0.012 5 m at different time steps"

组别 时间/ms 伸长量/mm 气动力/kN
A 0 0 3.57
1 0.171 3.37
2 0.375 1.44
2.725 0.696 —
B 0 0 3.57
1 0.107 3.23
2 0.270 3.20
3 0.462 2.60
3.5 0.762 —
C 0 0 3.57
1 0.014 3.52
2 0.041 3.46
3 0.087 3.41
4 0.191 3.35
5 0.364 3.17
5.925 0.752 —
D 0 0 3.76
1 0.103 3.30
2 0.264 3.28
3 0.452 2.62
3.562 5 0.760 —
E 0 0 3.52
1 0.109 3.14
2 0.274 3.10
3 0.468 2.53
3.475 0.764 —

Fig.7

Tucked-in movement state of yarn at different time steps in airflow field. (a) Group A; (b) Group B; (c) Group C; (d) Group D; (e) Group E"

Tab.2

Elongation of yarn and aerodynamic force of beam element node whose Y coordinate is 0.013 95 m at different time steps"

组别 时间/ms 伸长量/mm 气动力/kN
A 0 0 1.67
0.5 0.201 1.60
1 0.493 1.92
1.5 1.037 —
1.525 1.068 —
B 0 0 1.64
0.5 0.158 1.64
1 0.366 1.61
1.5 0.834 —
1.562 5 0.905 —
C 0 0 1.49
0.5 0.154 1.05
1 0.361 1.24
1.5 0.754 —
D 0 0 1.61
0.5 0.230 0.79
1 0.419 —
1.225 0.521 —
E 0 0 1.64
0.5 0.153 1.65
1 0.361 1.69
1.5 0.722 2.25
1.887 5 1.132 —

Fig.8

Tucked-in trajectory of yarn in experiment. (a) Group A; (b) Group B; (c) Group C; (d) Group D; (e) Group E"

Tab.3

Total elongation of yarn"

组别 数值模拟
总时间/ms		 数值模拟总
伸长量/mm		 实验总伸
长量/mm		 数值模拟
总伸长比/%		 实验总
伸长比/%
A 4.25 1.764 1.86 17.64 18.6
B 5.062 5 1.665 1.77 16.65 17.7
C 7.425 1.506 1.62 15.06 16.2
D 4.787 5 1.281 1.38 12.81 13.8
E 5.362 5 1.896 2.00 18.96 20.0

Fig.9

Motion trajectory diagram of numerical simulation and experimental results of three nodes. (a) Group A; (b) Group B; (c) Group C; (d) Group D; (e) Group E"

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