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

Abstract

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.

Effects of lattice apron density on yarn qualities in Four-line compact spinning system

“…Perforated drum and lattice apron are the two main kinds of pneumatic compact spinning systems and the condensing devices . At present, compact spinning with lattice apron is the most widely used (Su, Gao, Liu, Xie, & Xu, 2013). Three-line compact spinning and Four-line compact spinning are the two kinds of compact spinning systems with lattice apron, and Four-line compact spinning is used more widely at presented due to its advantages on maintenance and price .…”

Design of three-strand compact spinning system and numerical flow-field simulation for different structures of air-suction guides and suction inserts

“…Moreover, some researchers have compared the different pneumatic compacting technologies and investigated the effectiveness of compacting zones with computer-aided technologies. [20][21][22][23][24][25] In the literature and between commercial products, it is also seen that there are studies about the compact siro-spun technology, which was developed by combining compact and siro-spun technologies. 26,27 Throughout the development of alternative spinning technologies, the need for yarn of different structures has played an important role, as well as the need for more economical production and better yarn structures.…”

Study on the model of semi-open-end twist in compact spinning with lattice apron

“…A clear understanding of the compact spinning mechanism is conducive to produce higher quality yarn. At present, research on compact spinning mainly focuses on the additional twist mechanism, 1,2 the airflow field, [3][4][5] and the structure and performance of the compact spun yarn compared with the conventional spun yarns. [6][7][8][9][10][11] In perforated-lattice negative-pressure type compact spinning, the twist of the compact yarn is about 3-10% higher than that of ring-spun yarn under the same spinning conditions.…”