摘要
为明确喷气涡流纺纱的纺纱机理,研究喷嘴中喷孔数量、喷孔倾角和供气压力对喷气涡流纺内流场的影响情况,文章采用Fluent软件进行喷气涡流纺的内流场模拟分析。通过结果对比分析发现:喷孔数量和供气压力对喷嘴内流场的气流旋转运动影响较为显著,随着喷孔数量和供气压力的增加,喷嘴内气流的旋转运动显著增强,对纱线自由端纤维的加捻效果也增强;喷孔倾角大小对喷孔出口气流速度影响较小,但随着倾角增大,进入涡流管内的气流切向速度分量增大,对自由端纤维的加捻效果增强,纱线包缠越紧密,其强度也越高;喷孔数量、倾角和供气压力的变化都不会改变流场速度分布规律,只是改变了其值的大小,且随着气流的螺旋推进运动,气流速度不断衰减,说明气流在对纱线加捻的过程中要消耗大量的动能。
Air-jet vortex spinning is a new spinning technology,which uses high speed rotating airflow to twist free-end fibers into yarns in the air twisting chamber.This technology emitting the roving process integrates spinning,winding and winding molding processes,shortening the spinning process and making itself the most advanced and promising new spinning technology in the world.At present,air-jet vortex spinning machines are mainly imported from Japan.The main reason is that the twisting mechanism of air-jet vortex spinning has not been fully grasped by Chinese.Thus,many scholars have carried out relevant studies which mainly focus on the influence of structure and process parameters of nozzles and hollow spindles on the flow field characteristics and yarn forming performance,the motion characteristics of the fibers in the flow field,as well as the influence of the numbers and inclination angles of jet orifices on the flow field.There are few studies on the influence of numbers,inclination angles of jet orifices and air supply pressures on the internal flow field of air-jet vortex spinning.In view of this,the influence of these three parameters on the internal flow field of air-jet vortex spinning is studied in detail in this paper.It can provide a theoretical reference for the design of air-jet vortex spinning nozzles.Based on numerical method and single variable method,the influence of numbers and inclination angles of jet orifices as well as air supply pressures on the internal flow field of nozzles and twist characteristics were studied.Values of the three parameters of the reference configuration selected in this study were 5,70°and 0.5 MPa.And the three parameters could change as[4,5,6],[65°,70°,75°]and[0.3,0.4,0,5]MPa,respectively.The structure modeling,meshing and numerical simulation of the seven combined states were carried out respectively,and the velocity vector diagram and flow diagram obtained by simulation were compared and analyzed.There are four conclusions obtained.Firstly,as the number of jet o
作者
王青
叶明露
梁高翔
盛晓超
高帅
WANG Qing;YE Minglu;LIANG Gaoxiang;SHENG Xiaochao;GAO Shuai(School of Mechanical and Electrical Engineering,Xi’an Polytechnic University,Xi’an 710048,China)
出处
《丝绸》
CAS
CSCD
北大核心
2022年第4期39-44,共6页
Journal of Silk
基金
陕西省教育厅自然科学一般专项科学研究计划项目(20JK0644)。
关键词
喷气涡流纺
喷嘴参数
数值模拟
流场特性分析
纺纱机理
加捻效果
air-jet vortex spinning
nozzle parameters
numerical simulation
flow field characteristic analysis
spinning mechanism
twisting effect
