自排风式转杯纺纱通道内部气流场数值模拟

Numerical simulation of airflow field in spinning channelon automatic air-exhauster rotor

为深入研究自排风式转杯气流纺纱机理,借助流体动力学技术对其纺纱通道流场进行数值模拟。通过ICEM CFD和FLUENT仿真平台,构建基于RNG k-ε湍流方程的单相稳态流场物理模型。压力-速度耦合模拟结果表明:由输纤管道入口至出口方向,静压逐段减小、动压逐段增大,且气流流速呈递增式分布,出口处最大动压约6953 Pa、最大气流速度约99.23 m/s;在来流交汇区域,存在梯度明显的局部压力场,最大湍流速度约93 m/s;气流在凝聚槽附近具有较大轴向和切向速度,有利于纤维束的滑移和凝聚;排气孔内部气流流速稳定,最大排气速度约33~41 m/s;输纤管道气流补给对于纺纱通道流场形成起主导作用,由引纱管补给的少量气流主要用于平衡腔内负压,有助于探究自排风式转杯的输纤成纱工艺和气流场特性。

To conduct an in-dept study on the spinning mechanism of self-exhaust rotor spinner,numerical simulation of the flow field of its spinning channel was performed using fluid dynamics technology.A physical model of the single-phase steady-state flow field was constructed based on RNG k-εturbulence equation using ICEM CFD and FLUENTsoftware.The pressure-velocity coupling simulation results show that,from inlet to outlet of fiber feeding pipeline,the static pressure decreases gradually,while the dynamic pressure increases and the flow velocity in the pipeline is increasingly distributed.The maximum dynamic pressure of 6953 Pa and air velocity of 99.23 m/s at the outlet respectively.Besides,there exists a local pressure field with obvious gradient in the converging area of incoming flow,and the the maximum turbulent velocity at the area is about 93 m/s.The airflow exhibits a relatively large axial velocity and tangential velocity near the condensation tank,which is conducive to slip and condensation of the fiber bundle.The air flow velocity in the exhaust hole is stable,the maximum exhaust velocity of about 33~41 m/s.The airflow supply from the fiber pipeline plays a predominant role in the formation of flow field inside the spinning channel,and a small amount of airflow supplied by the fiber feeding pipeline is mainly used to balance negative pressure in the rotor,which can help explore the fiber feeding and yarn forming process of the self air-exhaust rotor,as well as the airflow field characteristics.