圆盘式旋流纺纱输送管道结构的研究
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摘要
圆盘式旋流纺纱是在利用喷射气流加工纱线的技术、并针对克服喷气纺纱方法所存在问题的基础上发明的一种新型纺纱方法。它以梳辊牵伸机构代替喷气纺纱中的罗拉牵伸机构,具有牵伸速度快、效率高,牵伸部件磨损小等优点。输送管道是圆盘式旋流纺纱机上连接牵伸机构和凝聚机构的关键部件,它利用空气的输运作用来实现纤维的输运、伸直和分离等功能,其结构会直接影响到纺纱过程对短纤维的控制程度,因而会对纱线质量产生重大影响。
本文通过数值解析手段对圆盘式旋流纺纱的关键部件——输送管道的结构进行研究。分析了圆盘式旋流纺纱线形态,讨论了圆盘式旋流纺纱存在的问题及其关键部件,对圆盘式旋流纺纱的输送管道结构进行了纺纱正交试验,得到了全体水平组合中关于条干不匀率、断裂强度、抗剥离性和的可能好的水平组合:进口长度a=30mm,底面长度b=43mm,出口长度c=24mm,出口宽度d=9mm,进口宽度e=22mm,底面和进口面的夹角α=30°,顶面和进口面的夹角β=148°。建立了输送管道流场的控制方程和交错网格条件下经二阶迎风离散的三维有限体积法离散方程组,对比了用三角形/四面体网格和四边形/六面体网格两种单元划分输送管道流场的计算结果,分析结果表明,四边形/六面体网格单元划分方式适用于圆盘式旋流纺纱机的输送管道流场的数值模拟。对圆盘式旋流纺纱机输送管道建立了管道流场微分控制方程组,然后利用CFD技术对不同结构参数的输送管道(进口长度、出口长度、项面和进口面的央角、底面长度、输送管道的进口长度、出口长度及底面和进口面的夹角等)流场的变化规律做了数值模拟和分析,以及误差试验和纺纱试验,阐明了圆盘式旋流纺纱机的输送管道结构参数的变化对管道内部流场的影响。在对圆盘式旋流纺纱机输送管道结构气流场的CFD数值模拟和纺纱实验的基础上,提出了一个新型的输送管道结构设计方案,并通过数值模拟、误差试验和纺纱试验进行了对比分析,证明了新的管道结构能有效提高圆盘式旋流纺纱机的纺纱质量。
研究结果将为圆盘式旋流纺纱的研究提供重要的理论与实验依据,对于改进圆盘式旋流纺纱的工艺性能、提高成纱质量具有积极的指导意义。
Disc swirl spinning is a new spinning method, which makes use of jet air to process yarn to resolve the matters in air-jet spinning. It substitutes roller drafting system with combing roller drafting system, which ensures that the drafting system of disc swirl spinning has the advantages of high drafting speed, high drafting efficiency, and little wearing. Fiber conveyor is a key component of disc swirl spinning frame. It can straighten, parallel, and uniform fibers in it by transport effect of air. Its structure will affect the control level of fibers during disc swirl spinning. Hence, the structure of fiber conveyor will affect the yarn quality greatly.
The numerical simulation method is adopted to analyze the structure of fibre conveyor, which is a key component of disc swirl spinning frame. The structure of disc swirl yarn is analyzed. The questions and the key component of disc swirl spinning frame are discussed. The spinning orthogonal tests are made to determine the possible good level combination of the structure parameters of fiber conveyor of disc swirl spinning on unevenness of the sliver, tenacity and peeling-off resistance, which are inlet length a=30mm, bottom length b=43mm, outlet length c=24mm, outlet width d=9mm, inlet width e=22mm, the angle between the bottom and the inletα=30°, the angle between the top and the inletβ=148°. The flow field control equations of fiber conveyor are setup, and the second-order discrete upwind Scheme under the condition of 3-D staggered grid is got with the method of FVM. The fiber conveyor are meshed by triangle/tetrahedron cells and square/hexahedron cells respectively, and the calculation results of these two kinds of meshes are compared, which indicate that square/hexahedron cell is suitable for numerical simulation of flow field of disc swirl spinning fiber conveyor. The differential flow field control equations of disc swirl spinning fiber conveyor are got, and the flow field in fiber conveyors are investigated by CFD, error tests and spinning tests. Results show the rules that the different structure parameters of fiber conveyor affect on the flow field, which are inlet length, bottom length, outlet length outlet width, inlet width, the angle between the bottom and the inlet, the angle between the top and the inlet. With the aid of the numerical simulation and analysis, a new design of the structure of the fiber conveyor is proposed, which is proved to be effective to raise the disc swirl spinning quality by numerical simulation, error tests and spinning tests.
The research results will provide important experimental and theory basis for the research of disc swirl spinning, which will result in the modification of disc swirl spinning machine and enhancing yarn quality.
本文通过数值解析手段对圆盘式旋流纺纱的关键部件——输送管道的结构进行研究。分析了圆盘式旋流纺纱线形态,讨论了圆盘式旋流纺纱存在的问题及其关键部件,对圆盘式旋流纺纱的输送管道结构进行了纺纱正交试验,得到了全体水平组合中关于条干不匀率、断裂强度、抗剥离性和的可能好的水平组合:进口长度a=30mm,底面长度b=43mm,出口长度c=24mm,出口宽度d=9mm,进口宽度e=22mm,底面和进口面的夹角α=30°,顶面和进口面的夹角β=148°。建立了输送管道流场的控制方程和交错网格条件下经二阶迎风离散的三维有限体积法离散方程组,对比了用三角形/四面体网格和四边形/六面体网格两种单元划分输送管道流场的计算结果,分析结果表明,四边形/六面体网格单元划分方式适用于圆盘式旋流纺纱机的输送管道流场的数值模拟。对圆盘式旋流纺纱机输送管道建立了管道流场微分控制方程组,然后利用CFD技术对不同结构参数的输送管道(进口长度、出口长度、项面和进口面的央角、底面长度、输送管道的进口长度、出口长度及底面和进口面的夹角等)流场的变化规律做了数值模拟和分析,以及误差试验和纺纱试验,阐明了圆盘式旋流纺纱机的输送管道结构参数的变化对管道内部流场的影响。在对圆盘式旋流纺纱机输送管道结构气流场的CFD数值模拟和纺纱实验的基础上,提出了一个新型的输送管道结构设计方案,并通过数值模拟、误差试验和纺纱试验进行了对比分析,证明了新的管道结构能有效提高圆盘式旋流纺纱机的纺纱质量。
研究结果将为圆盘式旋流纺纱的研究提供重要的理论与实验依据,对于改进圆盘式旋流纺纱的工艺性能、提高成纱质量具有积极的指导意义。
Disc swirl spinning is a new spinning method, which makes use of jet air to process yarn to resolve the matters in air-jet spinning. It substitutes roller drafting system with combing roller drafting system, which ensures that the drafting system of disc swirl spinning has the advantages of high drafting speed, high drafting efficiency, and little wearing. Fiber conveyor is a key component of disc swirl spinning frame. It can straighten, parallel, and uniform fibers in it by transport effect of air. Its structure will affect the control level of fibers during disc swirl spinning. Hence, the structure of fiber conveyor will affect the yarn quality greatly.
The numerical simulation method is adopted to analyze the structure of fibre conveyor, which is a key component of disc swirl spinning frame. The structure of disc swirl yarn is analyzed. The questions and the key component of disc swirl spinning frame are discussed. The spinning orthogonal tests are made to determine the possible good level combination of the structure parameters of fiber conveyor of disc swirl spinning on unevenness of the sliver, tenacity and peeling-off resistance, which are inlet length a=30mm, bottom length b=43mm, outlet length c=24mm, outlet width d=9mm, inlet width e=22mm, the angle between the bottom and the inletα=30°, the angle between the top and the inletβ=148°. The flow field control equations of fiber conveyor are setup, and the second-order discrete upwind Scheme under the condition of 3-D staggered grid is got with the method of FVM. The fiber conveyor are meshed by triangle/tetrahedron cells and square/hexahedron cells respectively, and the calculation results of these two kinds of meshes are compared, which indicate that square/hexahedron cell is suitable for numerical simulation of flow field of disc swirl spinning fiber conveyor. The differential flow field control equations of disc swirl spinning fiber conveyor are got, and the flow field in fiber conveyors are investigated by CFD, error tests and spinning tests. Results show the rules that the different structure parameters of fiber conveyor affect on the flow field, which are inlet length, bottom length, outlet length outlet width, inlet width, the angle between the bottom and the inlet, the angle between the top and the inlet. With the aid of the numerical simulation and analysis, a new design of the structure of the fiber conveyor is proposed, which is proved to be effective to raise the disc swirl spinning quality by numerical simulation, error tests and spinning tests.
The research results will provide important experimental and theory basis for the research of disc swirl spinning, which will result in the modification of disc swirl spinning machine and enhancing yarn quality.
引文
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