2023 Volume 69 Issue 6 Pages 117-122
During the production of synthetic fiber, a winder is used to wind the yarn, and the high-speed rotation of the package causes an increase in windage power due to high resistance from the surrounding air. However, to reduce costs of yarn production, it is important to improve energy consumption. Therefore, it is necessary to investigate the winder flow field using computational fluid dynamics（CFD）and reduce the windage power. In previous studies, simulations were performed using a model of the entire winder, however, the details on the flow field around the package were unknown. In this study, a touch-roll mechanism was incorporated into a simplified model to reduce the computational cost, and the flow field around the package was analyzed. The mechanism of increased windage was investigated to quantitatively determine the effective factors that reduce windage power by focusing on the flow field on the package surface layer that directly affects the windage. The results showed that incorporating the touch-roll mechanism had a significant effect on the windage power loss and the flow field, and that the increase in windage loss was observed particularly on the edge faces of the packages.
