输棉通道几何参数对转杯纺气流场影响的数值研究

输棉通道的几何形状以及输棉通道与转杯的空间位置关系对通道和转杯内部气流流动有很大的影响,进而影响纤维在输棉通道内的伸直状态。本文通过数值计算的方法研究了输棉通道和转杯内部气流流动特征,并讨论了输棉通道特征数和空间位置角对通道和转杯内部气流流动特性及纤维伸直状态的影响。模拟结果表明,梳棉通道负压从出口到入口呈现先平稳增加,后急剧增加的趋势,特征数越大,该趋势越明显;输棉通道内部速度差随着特征数增大而增大;空间位置角α增加,输棉通道轴向负压先减小后增大,而输棉通道轴向速度差增大;空间位置角β对输棉通道静压和速度的分布影响较小,它主要改变纤维与转杯的初始接触位置。

Numerical study on effect of geometric parameters of transfer channel on airflow in rotor spinning

The geometric parameters of the transfer channel and the spatial position of the rotor and channel have great influence on the air flow characteristics in the rotor spinning machine and then affect the straightness of the fibers in the transfer zone. The method of numerical simulation is used to study the air flow of the transfer channel and the rotor, and the effects of the transfer channel characteristic number and the spatial position of the rotor and channel on the air flow and fiber straightness are investigated. The simulation results show that from the inlet to the outlet of the transfer channel, the negative pressure increases steadily first, and then it increases dramatically, and this trend becomes more obvious with the increasing characteristic number. The velocity difference increases along with the increasing characteristic number. The negative pressure along the transfer channel diminishes first, and then enhances, while the velocity difference increase with the enlarging of the space angle α. The space angle β has comparatively small effect on the pressure and velocity distribution in the transfer channel; however, it mainly changes the initial contact position of fibers and the rotor.