Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (02): 100-105.doi: 10.13475/j.fzxb.20240906601

• Textile Engineering • Previous Articles     Next Articles

Simulation of flow field and fiber straightening in reconstructed fiber transport channel in rotor spinning

ZHANG Dingtiao1, WANG Qianru1, QIU Fang2, LI Fengyan1,2()   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. United Testing Services (Jiangsu)Co., Ltd., Suzhou, Jiangsu 215228, China
    3. Zhejing Haoyu Technology Co., Ltd.,Shaoxing, Zhejiang 312369, China
  • Received:2024-09-26 Revised:2024-11-29 Online:2025-02-15 Published:2025-03-04
  • Contact: LI Fengyan E-mail:fengyanli@tiangong.edu.cn

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Abstract:

Objective The geometry of the fiber transport channel in rotor spinning will change the distribution of the internal airflow field, and the airflow field greatly influences morphological changes in fiber movement. To study the influence of the fiber transport channel on the straightening effect of hooked fiber, the distribution state of the airflow field in the channel before and after reconstruction was simulated by using the fluid mechanics numerical simulation method.

Method A Laval tube fiber transport channel model was designed using SolidWorks software, and airflow motion state inside the reconstructed channel was simulated by Fluent, and the flexible hooked fiber model was established by EDEM. Based on the airflow field data obtained from Fluent simulation calculation, combined with the solid-liquid two-phase flow coupling method in EDEM, the shape change of hooked fibers in the airflow of the fiber transport channel was simulated to study the effect of different types of hooks on the straightening process of hooked fibers.

Results The maximum air velocity difference between the reconstructed fiber transport channel and the original is 6.63%, but high-speed airflow in the reconstructed fiber channel is relatively large, especially the area of high-speed airflow L3 section near the outlet is obviously larger than the original fiber channel outlet. When improving the movement of fibers in the fiber transport channel, the hooked fiber reached the high-speed airflow area earlier and the speed of the fiber head was increased, beneficial to the straightening of the hooked fiber. The hooked fiber in the reconstructed fiber channel was basically straight, while the fiber in the original fiber channel was not straight even when fiber reached the exit. According to the result of the straightness, the airflow field distribution in the reconstructed fiber transport channel was more conducive to the straightening of the hooked fiber. In comparison with the tradiational fiber transport channel, straightness of trailing right hooked fibers Ⅱ is increased from 88.70% to 97.80%.

Conclusion The airflow field of the reconstructed fiber transport channel in rotor spinning has a larger area of high-speed airflow compared with that of the original channel, which is more effective in accelerating the straightening of hooked fibers. Hooked fibers in the reconstructed fiber transport channel reach the channel outlet earlier and straighten better than in the original channel. The straightening effect of the reconstructed channel on the trailing hooked fiber is more obvious. The study analyzed the hooked fiber straightening process through numerical simulation, which guides the design of key components such as rotor-spinning fiber transport channels.

Key words: rotor spinning, fiber transport channel, hooked fiber, fiber straightness, numerical simulation

CLC Number: 

  • TS103.2

Fig.1

Geometric model of fiber transport channel"

Tab.1

Simulation parameters of airflow field in fiber transport channel"

模拟参数 类型 数值
网格单元 四面体网格 84 677
输纤通道入口 速度入口 10 m/s
输纤通道出口 压力出口 -8 000 Pa
输纤通道壁面 无滑移边界 —
湍流模型 RNG k-ε —

Fig.2

Hooked fiber model"

Tab.2

Fiber transport channel and fiber parameters"

类别 密度/(kg·m-3) 弹性模量/GPa 泊松比
纤维 1 540 7 0.4
输纤通道 7 850 210 0.3

Fig.3

Diagram of 3 sections of front(a) and back(b) hooked fiber"

Fig.4

Velocity distribution of airflow field in fiber transport channel. (a) Airflow velocity distribution in improved fiber transport channel; (b) Airflow velocity distribution in original fiber transport channel"

Fig.5

Straightening morphology of railing hooked fibers before and after fiber transmission channel improvement. (a)Fiber Ⅰ; (b)Fiber Ⅱ"

Fig.6

Velocity of trailing hooked fibers in fiber transport channel before and after reconstruction. (a) Fiber I in reconstructed channel; (b) Fiber I in original channel; (c) Fiber Ⅱ in reconstructed channel; (d) Fiber Ⅱ in original channel"

Fig.7

Straightening morphology of leading hooked fibers. (a) Fiber Ⅲ; (b)Fiber Ⅳ"

Fig.8

Velocity of leading hooked fibers in fiber transport channel before and after reconstruction. (a) Fiber Ⅲ in resconstructed channel; (b) Fiber Ⅲ in original channel; (c) Fiber Ⅳ in resconstructed channel; (d) Fiber Ⅳ in original channel"

Fig.9

Simulated fiber straightness test chart"

Tab.3

Comparison of simulated fiber straightness"

弯钩纤维
类别		 模拟时间/s 伸直度/%
改进前 改进后
Ⅰ 0.008 83.15 87.65
0.008 5 87.00 91.40
0.009 91.20 97.50
Ⅱ 0.008 82.00 88.15
0.008 5 83.25 93.35
0.009 88.70 97.80
Ⅲ 0.008 83.00 98.40
0.008 5 85.80 98.60
0.009 88.60 98.10
Ⅳ 0.008 85.10 96.50
0.008 5 86.85 97.25
0.009 91.25 96.85
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