Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (03): 160-167.doi: 10.13475/j.fzxb.20180304708

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Numerical simulation of airflow field in vortex spinning process

SHANG Shanshan1,2,3, YU Chongwen1,2, YANG Jianping1,2(), QIAN Xixi1,2   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China
    3. Shanghai University of Engineering Science, Shanghai 201620, China
  • Received:2018-03-21 Revised:2018-12-13 Online:2019-03-15 Published:2019-03-15
  • Contact: YANG Jianping E-mail:jpyang@dhu.edu.cn

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Abstract:

In order to explicit the discipline of airflow generation and development in yarn formation process under the action of high speed airflow and overcome shortcomings in the current research, three-dimensional numerical simulation of the airflow characteristics during the whole vortex spinning process, including the initial state of yarn drawing-in process and the normal stable process, were obtained and analyzed. Spinning experiments, with the aid of scanning electron microscope, were adopted to verify the results of the numerical simulation. The results show that the state of airflow field is steady, which has less turbulence phenomenon at the beginning of the process, the air streamlines move orderly, the negative pressure produces a strong suction force facilitating drawing fiber bundle into nozzle successfully, and the numerical simulation speculates that the fibers cluster is better, and the wrapped effect is worse, which is consistent with the spinning experiments. The turbulence phenomenon in normal spinning process is more obvious, the trajectory of airflow is complex, the vortex and reflux phenomenon appear, the upstream airflow provides an extra tension for the yarn and may improve yarn strength, the numerical simulation speculates the fiber wrapped effect is better, and the yarn tenacity is predicted higher in numerical simulation results and verified by the spinning experiment results.

Key words: vortex spinning, spinning process, airflow field, numerical simulation

CLC Number: 

  • TS101.2

Fig.1

Three-dimensional computational model of airflow field inside the nozzle"

Fig.2

Computational grid of nozzle. (a) Whole nozzle grid; (b) Grid refinement of twisting chamber and hierarchical grid of boundary layer and narrow place; (c) Refinement of jet orifice grid of vortex tube; (d) Refinement and optimization of jet orifice grid of doffing tube"

Fig.3

Vortex yarn forming mechanism"

Fig.4

Airflow field simulation results of initial state of vortex spinning process. (a) View of velocity volume rendering; (b) View of turbulent kinetic energy volume rendering;(c)View of velocity vector;(d) Streamline diagram of nozzle inlet; (e) Streamline diagram of jet orifice inlet of vortex tube;(f) Streamline diagram of jet orifices inlet of doffing tube; (g) View of velocity vector of cross-sections S1, S2, S3 and S4, respectively"

Fig.5

Airflow field simulation results of normal state of vortex spinning process. (a)View of velocity volume rendering; (b) View of turbulent kinetic energy volume rendering; (c) View of velocity vector;(d) Streamline diagram of nozzle inlet; (e) Streamline diagram of jet orifice inlet of vortex tube;(f) Streamline diagram of jet orifices inlet of doffing tube; (g) View of velocity vector of cross-sections S1, S2, S3 and S4, respectively"

Tab.1

Yarn tenacity test results"

管纱
编号		 成纱强度/(cN·tex-1)
初始纺纱过程值 正常纺纱过程值
1 8.26 10.59
2 7.32 10.61
3 7.43 9.96
4 7.21 10.67
5 7.34 10.53
平均值 7.51 10.47

Fig.6

Structure of viscose vortex yarn under SEM. (a) First viscose vortex yarn segments of initial state of yarn drawing-in spinning process; (b) Second viscose vortex yarn segments of initial state of yarn drawing-in spinning process; (c) First viscose vortex yarn segments of normal stable spinning process; (d) Second viscose vortex yarn segments of normal stable spinning process"

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