Numerical simulation of airflow field in vortex spinning process

In order to explicit the discipline of airflow generation and development in yarn formation process under the action of high speed airflow and overcome shortcomings in the current research, three-dimensional numerical simulation of the airflow characteristics during the whole vortex spinning process, including the initial state of yarn drawing-in process and the normal stable process, were obtained and analyzed. Spinning experiments, with the aid of scanning electron microscope, were adopted to verify the results of the numerical simulation. The results show that the state of airflow field is steady, which has less turbulence phenomenon at the beginning of the process, the air streamlines move orderly, the negative pressure produces a strong suction force facilitating drawing fiber bundle into nozzle successfully, and the numerical simulation speculates that the fibers cluster is better, and the wrapped effect is worse, which is consistent with the spinning experiments. The turbulence phenomenon in normal spinning process is more obvious, the trajectory of airflow is complex, the vortex and reflux phenomenon appear, the upstream airflow provides an extra tension for the yarn and may improve yarn strength, the numerical simulation speculates the fiber wrapped effect is better, and the yarn tenacity is predicted higher in numerical simulation results and verified by the spinning experiment results. Copyright No content may be reproduced or abridged without authorization.