摘要
为提高喷气织机辅助喷嘴的引纬效率,设计了3类多孔阵列式辅助喷嘴,揭示了多孔形状与阵列方式对合成气流速度分布和弹性纤维束运动位移的影响规律。建立了纤维束-气流耦合的动力学模型,基于任意拉格朗日-欧拉法数值模拟了三维瞬态流场分布及纤维束运动位移,并采用高速摄像机拍摄纤维束运动位移,验证了数值模拟结果的正确性。通过数值模拟得到了异形筘道内合成气流速度分布、速度梯度及纤维束头端运动位移。结果表明:异形筘道内合成气流速度梯度变化与纤维束头端位移具有相关性,合成气流速度梯度越小,纤维束运动位移也越小;三圆孔中心阵列辅助喷嘴形成的合成气流速度梯度最小,纤维束运动位移最小,适合用于弹力较大织物的引纬。
Objective In air jet looms,the weft yarn is propelled through a profiled reed channel by means of a synthetic airflow from a main nozzle and multiple relay nozzles.The structure of the relay nozzle directly affects the airflow speed,weft direction,and breakage rate during the insertion process.Although many researchers studied the fluid characteristics of single-hole relay nozzles,most of the published works ignored the interaction between airflow and the weft yarn.This paper aims to study the influences of structure parameters of multi-hole relay nozzles on the dynamic behavior of a clamp-free fiber bundle transformed by unsteady airflow in the profiled reed.Method Three types of multi-hole array auxiliary nozzles were designed.The Arbitrary Lagrangian-Euler method(ALE)was employed to simulate fluid-solid interaction between the unsteady airflow and an elastic fiber bundle.The three-dimensional transient airflow has been simulated using ANSYS Fluent 2020,in which the fiber bundle is solved simultaneously using coupled scheme.Then,the motion displacements of fiber bundle were captured by a high-speed camera to confirm the accuracy of the numerical simulation.The image capture rate was adjusted to 10000 frames′s to capture the motion of the yarn.The influences of outlet shape,array layout,and inlet pressure of the auxiliary nozzles on the airflow velocity pulsing and the bending deformation of the fiber bundle were revealed.Results The simulation results for the airflow velocity and bending deformation of fiber bundle were presented.In order to validate the numerical scheme,the motion deformation of the fiber bundle captured by the high-speed camera was compared with numerical simulation.As observed,a good agreement existed between the numerical and experimental values.Synthetic flow field-weft yarn coupling contour showed the velocity contour of synthetic airflow and motion deformation of the fiber bundle in different time steps for three types of relay nozzles.The influences of the outlet shape and array on ai
作者
方敬兵
沈敏
李俊祥
王真
余联庆
FANG Jingbing;SHEN Min;LI Junxiang;WANG Zhen;YU Lianqing(School of Mechanical Engineering&Automation,Wuhan Textile University,Wuhan,Hubei 430200,China;Hubei Key Laboratory of Digital Textile Equipment,Wuhan Textile University,Wuhan,Hubei 430200,China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2024年第3期194-201,共8页
Journal of Textile Research
基金
国家自然科学基金项目(51505344,11872048)
湖北省自然科学基金项目(2014CFB766)
湖北省数字化纺织装备重点实验室开放课题(2020001)
湖北省高等学校优秀中青年科技创新团队计划项目(T2022015)。
关键词
喷气织机
引纬效率
流固耦合
辅助喷嘴
合成气流
air-jet loom
weft insertion efficiency
fluid-solid coupling
relay nozzle
synthetic airflow
