基于CFD的短纤纱经编机吸风装置外流场分析

CFD Based Outer Flow Field Analysis of Suction Device of Staple Yarn Warp Knitting Machine

为清除短纤纱在经编织造过程中脱落在织针等成圈机件上的飞花,在成圈区域后侧设计了以吸风方式清除飞花的除尘装置。针对吸风口外流场建立流场域,基于计算流体动力学方法(CFD),采用k-ε三维湍流模型,利用Ansys Workbench内的流体仿真软件Fluent对吸风口外流场进行模拟仿真。结果表明:在80.0 Pa负压条件下,吸风口内部压力变化不大,外部压力迅速降低,针床周围的空气压力为负压力0.6~1.0 Pa、风速为0.5~0.7 m/s,可有效清除脱落在成圈区域的飞花。

In order to clean up the lint of staple yarns on the looping elements such as needles during the knitting process, a suction dust removal device is installed behind the loop forming part. A flow field is established for the outflow field of suction outlet based on the computational fluid dynamics(CFD). Adopting k-ε three-dimensional turbulence model, the outflow field of suction outlet is simulated using the fluid simulation software Fluent in Ansys Workbench. The results show that with the negative pressure of 80.0 Pa, the internal pressure of the suction outlet changes little and external pressure decreases sharply. The air pressure around the needle bar is under 0.6~1.0 Pa negative and the wind speed is between 0.5~0.7 m/s. Under this condition the lint in the loop forming part can be cleaned efficiently.