Numerical Study of the Three-dimensional Flow Field in Compact Spinning with Inspiratory Groove

Self Cite

Compact-siro spinning is a new kind of spinning technique that combines compact spinning and siro spinning, and is widely put into practice. In this paper, a simulation and characterization of the flow field in the condensing zone are made by computational fluid dynamics software. It mainly includes the distribution rules of static pressure and velocity. According to the relative references and factory condition, several orthogonal and control experiments have been done. Through testing the strength, evenness and hairiness properties and analyzing and comparing the results with the data of three different suction slots, we select the compact-siro spinning suction device whose yarn has the best overall performance. The theory analysis gives foundation and explanation for the experiment, and also provides a theoretical basis for optimizing the properties of compact-siro yarn in production practice.Compact-siro spinning 1 is a new kind of spinning technique that combines compact spinning 2 and siro spinning, 3 and is widely put into practice. Siro spinning parallelly feeds two rovings with a certain pitch into the same drafting zone of the spinning frame. Then the two rovings are twisted on one spindle after the draft parallelly. The structure of siro spun yarn is similar to plied yarn, with good strength, hairiness 4 and evenness properties. However, it has disadvantage of worse twist stability and indistinctive plied yarn characteristic. As previous research shows, the compact spinning system 5 can decrease the twisting triangle zone and make the fiber tangled. Therefore, considering the advantage of the two spinning techniques, compactsiro spinning can give the yarn a stable and obvious twisting structure under negative pressure. 6 Yang 7 studied an advanced spinning technology that combined compact spinning and siro-spinning in a traditional ring spinning machine. Wang 8 studied the spinning mechanism and the yarn structure of compact-siro spinning. Wang 9 made a systematic analysis for the causes of the increase in compact-siro spun yarn strength, evenness and the decrease in hairiness in theory. Lu 10 studied influences of airflow on fiber movement on compact-siro spinning with a lattice apron. If the technique is mature enough, it will result in savings in cost, energy and labor force, leading to better market prospects. In this paper, the numerical simulation of airflow in the condensing zone of compact-siro spinning is studied, and the impact factors of the agglomeration effects are analyzed. The comprehensive performances of three different suction slots are compared, and the compact-siro spinning suction device whose yarn has the best overall performance is selected.

“…Automatic control is used when refining by Fluent. The range of the X-axis [0, 19], Y-axis [- 6,12] and Z-axis [0, 3] is set in REGION. 12 After the Boundary condition setting.…”

Section: Numerical Simulationmentioning

confidence: 99%

Numerical simulation and analysis of airflow in the condensing zone of compact-siro spinning

Han

Wei

Xue

et al. 2015

Self Cite

“…8,11,13 Subsequently, CCS with a lattice apron has received more attention both in industrial and academic research. [14][15][16][17] More research efforts on the CCS system have been focused on understanding the air-flow domain, which is believed to define the yarn formation process. 16,17 In order to study the flow field in the condensing zone for pneumatic CCS, there are different methods, namely the traditional theoretical method, the experimental measurement method, and the computational fluid dynamics (CFD) method.…”

mentioning

confidence: 99%

“…[14][15][16][17] More research efforts on the CCS system have been focused on understanding the air-flow domain, which is believed to define the yarn formation process. 16,17 In order to study the flow field in the condensing zone for pneumatic CCS, there are different methods, namely the traditional theoretical method, the experimental measurement method, and the computational fluid dynamics (CFD) method. CFD is the most powerful system used because it is cost-effective and has higher precision compared with the other methods.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional simulation and experimental investigation of three-dimensional printed guiding devices on lattice-apron compact spinning

Saty

Akankwasa

Wang

2020

The compact spinning system with a lattice apron utilizes air-flow dynamics to condense fibers in a bunch and enhance the yarn properties. One of the main challenges with this method is the lack of a comprehensive understanding of the air-flow field's effect in the condensing zone. This work presents a numerical and experimental investigation of the effects of three-dimensional (3D) printed guiding devices on the air-flow characteristics and yarn properties. Firstly, the 3D numerical model of the compact spinning system was set up based on the compact spinning machine geometrical dimensions. Secondly, different 3D prototypes were developed, simulated, and analyzed using computational fluid dynamics based on ANSYS software. The prototypes (A-type, B-type, and C-type), selected according to the simulation results, were then 3D printed to enable further experimental investigation. Air-flow analysis results in the air-suction flume area exhibiting a very high negative pressure, and the centerline zone was characterized by high velocity. Experimental results revealed that the three yarns spun with guiding devices had better strength, hairiness, and evenness than those spun without a guiding device. The model developed can be further improved and utilized for commercial purposes and is anticipated to improve compact spun yarn properties significantly.

“…1,2 Therefore, research on compact spinning has attracted more and more attention. 3–7 According to the condensing principle, a compact spinning system is divided into pneumatic compacting and non-pneumatic compacting. At present, there are five major kinds of compact spinning system: Rieter, Sussen, Toyota, Zinser, and Roscraft.…”

mentioning

confidence: 99%

Numerical simulation of a three-dimensional flow field in compact spinning with a perforated drum: Effect of a guiding device

Gao

Liu

et al. 2013

Compact spinning with a perforated drum is one of the most important kinds of pneumatic compacting. It utilizes the transverse air force in a perforated drum to condense the fiber bundle in order to effectively eliminate the spinning triangle and improve the qualities of spun yarns. Therefore, the emphasis in research on a flow field in the condensing zone is always on the difficulty of pneumatic compact spinning. In this paper, the three-dimensional flow field of compact spinning of a perforated drum with a guiding device is investigated using Fluent software. First, a three-dimensional model, using AutoCAD Software, of the condensing zone is given. Then, the numerical simulations, by using Fluent software, of the three-dimensional flow field in compact spinning of a perforated drum with three guiding devices (type A, type B, and type C) and without a guiding device are presented, respectively. It is shown that the effective range of the negative pressure in the condensing zone of the compact spinning system with a perforated drum and guiding device increases significantly as compared with that of compact spinning without a guiding device. The flow field distribution is symmetric with respect to the central line of air-suction flume. The fiber strands move toward the center under the left–right symmetric transverse air force, which achieves transverse converging effects. Meanwhile, the static pressure shows a wavy distribution due to the influence of round holes. Furthermore, it is proved that the comprehensive effect of the type C guiding device is the best. Finally, the theoretical results obtained are illustrated by spinning experiments.