Numerical Study on Effect of Suction Slot Geometric Parameters on Airflow Field in Compact Spinning

doi:10.1007/s12204-022-2521-7

Abstract

Abstract: The airflow field in the condensing zone is crucial as it affects the fiber condensing, additional twists, and consequently yarn properties. Parameters of spinning and suction slot geometric were found to be key factors influencing the airflow characteristics. To develop a better understanding of the complex airflow field within the pneumatic compact spinning system with lattice apron, a 3D numerical simulation model was built and the influence of negative pressure and geometric of suction slot was investigated. The results reveal that the accelerating air from the top of the suction slot generates transverse condensing force and downward pressure on the fiber strand. The inclination angle has a small effect on airflow velocity. The absolute z-velocity and x-velocity in the positive x-axis were both increased with increasing the slot width from 1.0 mm to 1.5 mm. An arc suction slot increased the absolute z-velocity and x-velocity compared with a linear one, thus benefiting fiber condensing. By decreasing the outlet negative pressure to −3 kPa, the airflow velocity increased significantly.

Key words: suction slot, airflow, compact spinning, simulation

摘要： 集聚区的气流场影响纤维的集聚和附加捻度，从而影响纱线的性能。纺纱参数和吸风槽几何参数是影响气流特性的关键因素。为了更好地理解带网格圈的气动紧密纺系统内部复杂的气流场，建立了三维数值模拟模型，研究了负压和吸风槽几何形状对系统内部复杂气流场的影响。结果表明，吸风槽顶部的加速气流对纤维束产生横向的集聚力和向下的压力。倾角对气流速度的影响较小。当槽宽从1.0 mm增加到1.5 mm时，正x轴的z、x向速度均增加。与线性吸风槽相比，弧形吸风槽增加了z、x向速度，有利于纤维集聚。通过降低出口负压至−3 kPa，气流速度显著增加。

关键词: 吸风槽，气流，紧密纺，模拟

CLC Number:

TS111

LIN Huiting^1,2 (杨娜), WANG Jun^1∗ (张淑霞), ZHANG Yongfa³ (白牡丹). Numerical Study on Effect of Suction Slot Geometric Parameters on Airflow Field in Compact Spinning[J]. J Shanghai Jiaotong Univ Sci, 2024, 29(2): 245-251.

References

[1] HOSSAIN M, ABDKADER A, CHERIF C, et al. Innovative twisting mechanism based on superconducting technology in a ring-spinning system [J]. Textile Research Journal, 2014, 84(8): 871-880.
[2] WEI L, HUANG S P, ZHU T, et al. Research on shape of spinning triangles in the ring spinning system [J]. The Journal of the Textile Institute, 2016, 107(4): 420-430.
[3] KHURSHID M F, NADEEM K, ASAD M, et al. Comparative analysis of cotton yarn properties spun on pneumatic compact spinning systems [J]. Fibres & Textiles in Eastern Europe, 2013, 21(5): 30-34.
[4] ALMETWALLY A A, MOURAD M M, HEBEISH A A, et al. Comparison between physical properties of ring-spun yarn and compact yarns spun from different pneumatic compacting systems [J]. Indian Journal of Fibre and Textile Research, 2015, 40(1): 43-50.
[5] CHENG K P S, YU C. A study of compact spun yarns [J]. Textile Research Journal, 2003, 73(4): 345-349.
[6] BASAL G, OXENHAM W. Comparison of properties and structures of compact and conventional spun yarns [J]. Textile Research Journal, 2006, 76(7): 567-575.
[7] FU T, YANG J P, CHENG G W, et al. Mechanical modeling of an arc-shaped suction slot for compact spinning and analysis of additional twists [J]. Textile Research Journal, 2018, 88(21): 2499-2505.
[8] ALTAS S, KADOGLU H. Comparison of conventional ring, mechanical compact and pneumatic compact yarn spinning systems [J]. Journal of Engineered Fibers and Fabrics, 2012, 7(2): 155892501200700.
[9] YANG J P, WANG J, BU H G, et al. Mechanical analysis on constant cross-section segment of fiber band in condensing zone during compact spinning [J]. The Journal of the Textile Institute, 2012, 103(2): 117-123.
[10] SU X Z, GAO W D, LIU X J, et al. Numerical simulation of a three-dimensional flow field in compact spinning with a perforated drum: Effect of a guiding device [J]. Textile Research Journal, 2013, 83(19): 2093-2108.
[11] LIU X Y, LIU X J. Numerical simulation of the threedimensional flow field in four pneumatic compact spinning using the Finite Element Method [J]. Textile Research Journal, 2015, 85(16): 1712-1719.
[12] ZHANG X C, ZOU Z Y, CHENG L D. Numerical study of the three-dimensional flow field in compact spinning with inspiratory groove [J]. Textile Research Journal, 2010, 80(1): 84-92.
[13] G?KTEPE F, YILMAZ D, G?KTEPE ?. A comparison of compact yarn properties produced on different systems [J]. Textile Research Journal, 2006, 76(3): 226-234.
[14] KRIFA M, ETHRIDGE M D. Compact spinning effect on cotton yarn quality: Interactions with fiber characteristics [J]. Textile Research Journal, 2006, 76(5): 388-399.
[15] YILMAZ D, USAL M R. A comparison of compact-jet, compact, and conventional ring-spun yarns [J]. Textile Research Journal, 2011, 81(5): 459-470.
[16] ZOU Z Y, DE ZHU Y, HUA Z H, et al. Studies of flexible fiber trajectory and its pneumatic condensing mechanism in compact spinning with lattice apron [J]. Textile Research Journal, 2010, 80(8): 712-719.
[17] HAN C C, WEI M Y, XUE W L, et al. Numerical simulation and analysis of airflow in the condensing zone of compact-siro spinning [J]. Textile Research Journal, 2015, 85(14): 1506-1519.
[18] HAN C C, GAO W D, CHEN L F. Numerical simulation of the condensing effect of different suction slots on fiber strands in a compact siro spinning machine with lattice apron [J]. Autex Research Journal, 2020, 20(1): 1-10.
[19] SATY M Y, AKANKWASA N T, WANG J. Threedimensional simulation and experimental investigation of three-dimensional printed guiding devices on latticeapron compact spinning [J]. Textile Research Journal, 2021, 91(11/12): 1389-1398.
[20] SATY M Y H, AKANKWASA N T, WANG J. Numerical simulation and analysis of airflow in the condensing zone of compact spinning with lattice apron [J]. Autex Research Journal, 2022, 22(3): 258-263.
[21] FU T, ZHANG Y Z, AKANKWASA N T, et al. Study on the model of semi-open-end twist in compact spinning with lattice apron [J]. Textile Research Journal, 2021, 91(5/6): 467-479.
[22] LIU X J, LIU W L, ZHANG H, et al. Research on pneumatic compact spun yarn quality [J]. The Journal of the Textile Institute, 2015, 106(4): 431-442.