转杯纺旁路通道设计对成纱质量的影响
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摘要
为减小或消除在输纤通道入口处产生的气流漩涡以降低其对纤维形态产生的不良影响,通过在输纤通道长轴一侧设置旁路通道向输纤通道补气,并采用数值模拟方法研究设置有旁路通道的气流场分布,结合纺纱试验和纤维形态测试,研究该旁路通道对改善气流场分布及转杯成纱性能的效果。结果表明:采用旁路通道进行补气可消除输纤通道入口处的气流漩涡,提高纤维剥取区的气流速度,从而提高纤维剥离牵伸倍数;设置有旁路通道的转杯纺纱器对提高成纱断裂强度具有良好的作用,对降低凝聚槽中弯钩纤维的数量有一定的效果,说明消除气流漩涡和提高纤维剥离牵伸倍数有助于纤维形态的改善,从而提高成纱断裂强度。
In order to reduce or eliminate the vortices generated at the transport channel inlet so as to decrease its adverse effect on fiber configuration, a bypass channel located on the extension of the long side of the transport channel was introduced as an air supply channel. The numerical simulation method was adopted to study the airflow dynamics of the modified transport channel. Combining with the spinning tests and fiber configuration tests, the effectiveness of the bypass channel in improving the airflow field and rotor spun-yarn properties was evaluated. The results show that by adopting the bypass channel, the vortices generated at the transport channel can be eliminated, and the air velocity in fiber separation area is increased, thus increasing the fiber peeling-drawing ratio. The rotor spinning machine with the bypass channel has a positive effect on improving the yarn tenacities as well as decreasing the number of hook fibers in the rotor groove. This indicates that eliminating the vortices and increasing the fiber peeling-drawing ratio are beneficial to fiber morphology, thus improving the yarn fracture strength.
In order to reduce or eliminate the vortices generated at the transport channel inlet so as to decrease its adverse effect on fiber configuration, a bypass channel located on the extension of the long side of the transport channel was introduced as an air supply channel. The numerical simulation method was adopted to study the airflow dynamics of the modified transport channel. Combining with the spinning tests and fiber configuration tests, the effectiveness of the bypass channel in improving the airflow field and rotor spun-yarn properties was evaluated. The results show that by adopting the bypass channel, the vortices generated at the transport channel can be eliminated, and the air velocity in fiber separation area is increased, thus increasing the fiber peeling-drawing ratio. The rotor spinning machine with the bypass channel has a positive effect on improving the yarn tenacities as well as decreasing the number of hook fibers in the rotor groove. This indicates that eliminating the vortices and increasing the fiber peeling-drawing ratio are beneficial to fiber morphology, thus improving the yarn fracture strength.
引文
[1] DAS A, ALAGIRUSAMY R. Fundamental principles of open end yarn spinning [J]. Advances in Yarn Spinning Technology, 2010: 79-101.
[2] LAWRENCE C A, CHEN K Z. A study of the fibre-transfer-channel design in rotor-spinning: part II: optimization of the transfer-channel design [J]. Journal of the Textile Institute, 1988, 79(3): 393-408.
[3] LAWRENCE C A, CHEN K Z. A Study of the fibre-transfer-channel design in rotor-spinning: part I: the fibre trajectory [J]. Journal of the Textile Institute, 1988, 79(3): 367-392.
[4] 张礼会, 张百祥. 转杯纺纤维输送管道的研究 [J]. 中国纺织大学学报, 1991, 17(6): 16-24.ZHANG Lihui, ZHANG Baixiang. A study of fiber transfer channel in rotor spinning [J]. Journal of China Textile University, 1991, 17(6): 16-24.
[5] KONG L X, PLATFOOT R A. Two-dimensional simulation of air flow in the transfer channel of open-end rotor spinning machines [J]. Textile Research Journal, 1996, 66(10): 641-650.
[6] LIN H T, BERGADA J M, ZENG Y C, et al. Rotor spinning transfer channel design optimization via computational fluid dynamics [J]. Textile Research Journal, 2018, 88(11): 1244-1262.
[7] KONG L X, PLATFOOT R A. Fibre transportation in confined channel with recirculations [J]. Computers & Structures, 2000, 78(1): 237-245.
[8] KONG L X, PLATFOOT R A. Computational two-phase air/fiber flow within transfer channels of rotor spinning machines [J]. Textile Research Journal, 1997, 67(4): 269-278.
[9] 上海市纺织科学研究院. 气流纺纱理论与实践 [M]. 上海: 上海科学技术出版社, 1984:35-62.Shanghai Institute of Textile Science. Theory and Practice of Rotor Spinning [M]. Shanghai: Shanghai Scientific and Technical Publishers, 1984: 35-62.
[10] LAWRENCE C A, JIANG R K. A study of the mechanics of fibre-straightening during deposition in the disc-spinning process. part I: theoretical conside-ration [J]. Journal of the Textile Institute, 1996, 87(1): 23-36.
[11] LAWRENCE C A, CHEN K Z. 16-high-speed photographic studies of the fibre configuration during transfer from the opening roller of a rotor-spinning unit [J]. Journal of the Textile Institute, 1986, 77(3): 201-211.
[2] LAWRENCE C A, CHEN K Z. A study of the fibre-transfer-channel design in rotor-spinning: part II: optimization of the transfer-channel design [J]. Journal of the Textile Institute, 1988, 79(3): 393-408.
[3] LAWRENCE C A, CHEN K Z. A Study of the fibre-transfer-channel design in rotor-spinning: part I: the fibre trajectory [J]. Journal of the Textile Institute, 1988, 79(3): 367-392.
[4] 张礼会, 张百祥. 转杯纺纤维输送管道的研究 [J]. 中国纺织大学学报, 1991, 17(6): 16-24.ZHANG Lihui, ZHANG Baixiang. A study of fiber transfer channel in rotor spinning [J]. Journal of China Textile University, 1991, 17(6): 16-24.
[5] KONG L X, PLATFOOT R A. Two-dimensional simulation of air flow in the transfer channel of open-end rotor spinning machines [J]. Textile Research Journal, 1996, 66(10): 641-650.
[6] LIN H T, BERGADA J M, ZENG Y C, et al. Rotor spinning transfer channel design optimization via computational fluid dynamics [J]. Textile Research Journal, 2018, 88(11): 1244-1262.
[7] KONG L X, PLATFOOT R A. Fibre transportation in confined channel with recirculations [J]. Computers & Structures, 2000, 78(1): 237-245.
[8] KONG L X, PLATFOOT R A. Computational two-phase air/fiber flow within transfer channels of rotor spinning machines [J]. Textile Research Journal, 1997, 67(4): 269-278.
[9] 上海市纺织科学研究院. 气流纺纱理论与实践 [M]. 上海: 上海科学技术出版社, 1984:35-62.Shanghai Institute of Textile Science. Theory and Practice of Rotor Spinning [M]. Shanghai: Shanghai Scientific and Technical Publishers, 1984: 35-62.
[10] LAWRENCE C A, JIANG R K. A study of the mechanics of fibre-straightening during deposition in the disc-spinning process. part I: theoretical conside-ration [J]. Journal of the Textile Institute, 1996, 87(1): 23-36.
[11] LAWRENCE C A, CHEN K Z. 16-high-speed photographic studies of the fibre configuration during transfer from the opening roller of a rotor-spinning unit [J]. Journal of the Textile Institute, 1986, 77(3): 201-211.