首页|基于Ω漩涡识别方法探究转杯凝聚槽漩涡对纺纱质量的影响

基于Ω漩涡识别方法探究转杯凝聚槽漩涡对纺纱质量的影响

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
为了更为准确地识别与分析转杯纺转杯内复杂多变流场中的涡流情况，提出了一种结合Ω漩涡识别方法和图像处理的漩涡识别技术。文章对Fluent仿真得到的转杯流场进行了分析，得到了凝聚槽平面的漩涡数量与面积，并进一步探究了凝聚槽内漩涡分布对纱线质量的影响。结果表明:Ω漩涡识别方法对凝聚槽漩涡有较好的捕捉效果，经过图像处理后可以定量化分析转杯内部气流流场的涡流情况;凝聚槽内漩涡主要分布在输纤通道出口处以及背后气流交汇处;随着转速的提升，转杯凝聚槽内细小漩涡面积增加，不利于纱线聚合;较大直径转杯凝聚槽部位漩涡面积更小，有利于纤维聚合。文章通过图像识别的方式探究转杯内流场的漩涡分布特征，为优化转杯纺结构提供了一定理论支持。
Influence of vortexes within the rotor's condensation slot on yarn quality based on Ω vortex identification method
Rotor spinning utilizes airflow as a driving force to achieve operations such as fiber transport and aggregation.The characteristics of the airflow field during the spinning process directly impact the spinning results.The article employs simulation software to model the movement of airflow within the rotor,investigating the correlation between the airflow field inside the rotor and the quality of yarns.The research provides valuable guidance for enhancing the structure of rotor spinning.To more accurately identify and analyze the vortex patterns within the complex and dynamic flow field inside the rotor in air-jet spinning,a vortex identification method combining the Ω vortex determination criteria with image processing was proposed.The method involved analyzing the flow field within the rotor obtained through simulation with FLUENT.,provideing insights into the number and area of vortexes in the condensation slot.The properties of these vortexes were further discussed.The simulation analysis results indicate that the distribution of static pressure values on the rotor's surface is uneven,leading to varying pressures at different locations across the rotor.Within the fiber delivery channel,the static pressure gradually increases to-7 kPa as the channel diameter decreases.Notably,there is a substantial static pressure gradient change on the wall surface near the channel outlet.Inside the rotor,the fastest airflow velocity observed at the location of the condensation slot forms a circular ring of high velocity.The middle section of the rotor experiences slower airflow velocities,extending to the entrance of the yarn guide tube.On the side of the rotor closer to the fiber delivery channel,there is a long strip-like region with higher airflow velocity.By observing the vortexes identified using the Ω method,it is evident that this approach has a superior ability to capture vortexes within the plane.It not only captures the larger vortexes displayed in streamline plots but also effectively captures smaller vortexes within the condensation slot that may not be discernible in streamline plots.Additionally,vortexes within the condensation slot are primarily concentrated at the outlet of the fiber delivery channel and at the intersection of airflow behind it.This phenomenon arises due to the relatively complex airflow movement in these two positions.As the rotational speed increases,the area of smaller vortexes inside the rotor's condensation slot also increases.The vortex area increases from 14.1 mm2 to 18.5 mm2,and the yarn coefficient of variation increases from from 15.33 to 15.99,resulting in decreased overall yarn uniformity.The increase in rotational speed also leads to an increase in the number of coarse and fine nodes on the yarn,resulting in a decline in yarn quality.When the rotor diameter is increased,the area of vortexes within the rotor's condensation slot decreases.The vortex area reduces from 15.6 mm2 to 10.7 mm2,representing a reduction of 31.4%.The coefficient of variation decreases from 15.53 to 15.02,indicating enhanced yarn uniformity and improved spinning results.The Ω vortex identification method exhibits excellent capturing capability for vortexes on the plane of the condensation slot.After undergoing image processing,this method allows for the quantitative analysis of the vortex patterns within the internal airflow field of the spinning cup.Vortexes within the condensation slot are mainly concentrated at the outlet of the fiber delivery channel and at the intersection of airflow behind it.Lowering the spinning cup's rotational speed and increasing its diameter can enhance the quality of the yarn.

rotor spinningnumerical simulationairflow fieldΩ vortex identification methodimage processing

钱淼、杨振斌、石焕强、向忠、张建新

展开 >

浙江理工大学浙江省现代纺织装备技术重点实验室,杭州 310018

浙江泰坦股份有限公司,浙江新昌 312500

转杯纺 数值模拟 气流场 Ω漩涡识别方法 图像处理

国家自然科学基金项目浙江省"尖兵""领雁"研发攻关计划项目浙江省"尖兵""领雁"研发攻关计划项目浙江省"尖兵""领雁"研发攻关计划项目

621733072023C011582022C011882022C01065

2024

10.19398/j.att.202401004

现代纺织技术
浙江理工大学 浙江省纺织工程学会

现代纺织技术

CSTPCD北大核心
影响因子：0.31
ISSN：1009-265X
年,卷(期)：2024.32(7)
  • 17