基于螺旋导引槽空心锭子的喷气涡流纺加捻腔流场模拟

针对喷气涡流纺纺纱过程中存在的成纱强力偏低的问题，提出一种基于螺旋导引槽空心锭子以提高成纱强力的方法。通过数值模拟的方法，研究基于螺旋导引槽空心锭子的加捻腔气流场流动特征，验证螺旋导引槽空心锭子结构对成纱性能的改善作用。结果表明：空心锭子外表面的螺旋导引槽可以引导气流流动，使自由尾端纤维的加捻作用增强；此外，螺旋导引槽结构的存在，导致槽内外气流的静压和速度存在差异，引起自由尾端纤维的内外转移，并产生自捻效应，可进一步实现喷气涡流纺纱线强力的提高。

Numerical simulation for twisting chamber of air jet vortex spinning based on hollow spindle with spiral guiding grooves

In order to improve the yarn strength, a kind of hollow spindle with spiral guiding grooves was proposed to solve the problem of low yarn strength for air jet vortex spinning. In this paper, the numerical simulation method was used to study the flow field characteristics of the twisting chamber of air jet vortex spinning based on hollow spindle with spiral guiding grooves and to verify the improved effect of spiral guiding groove structure of hollow spindle on the yarn property. The results show that the spiral guiding groove structure can guide the flow of air and increase the twisting action of the free-end fiber. In addition, the existence of spiral guiding grooves causes the static pressure and velocity of the airflow inside and outside the grooves to be different, which results in the migration and self-twist of the free-end fiber, and further improves the yarn strength of the air jet vortex spinning.