纤维在输纤通道气流场中运动的模拟

Simulation on fiber motion in airflow field of transfer channel

为深入探讨纤维在转杯纺纱通道尤其是输纤通道气流场中的运动形态,采用数值模拟的方法获得转杯纺纱通道内的气流流动特征,在此基础上建立了单纤维在气流场中的动力学方程,并讨论了伸直纤维和不同弯钩度的前弯钩纤维在输纤通道内的运动形态。模拟结果表明:输纤通道入口处存在气流漩涡;输纤通道横截面上的气流速度分布不均匀,通道中心比壁面附近的气流速度高,纵向方向的气流速度则不断增大;输纤通道内的纤维倾向于沿着气流速度较高的通道中心运动;纵向加速气流有利于保持伸直纤维的形态和伸直弯钩纤维;伸直弯钩的耗时随着弯钩度的增大而增大,而增大通道内的气流速度有利于缩短弯钩伸直的耗时。

In order to study the fiber configuration in the airflow field of the rotor spinning channel, especially the transfer channel,which has a great influence on the rotor spun yarn properties. The airflow characteristics in the rotor spinning channel were obtained by numerical simulation, then the fiber dynamical equations were developed. The motion of straight and leading hooked fibers in the transfer channel were discussed. The simulation results show that vortices exist at the transfer channel inlet, and the distribution of the air velocity in the transfer channel cross section is uneven, and the air velocity in the transfer channel center is higher than that near the wall, however, the air velocity is increasing from the transfer channel inlet to the outlet. The fiber tends to move along the transfer channel center which has higher air velocity. The accelerating air helps the straight fiber to maintain its form and straighten the hooked fiber. The time for straightening the hook increases with the increasing of the bending degree, while increasing the air velocity in the transfer channel is conducive to shorten the time.