目的 研究不同运动速度下薄膜和导向辊之间夹带气体的流场特性。方法 分析薄膜和导向辊的运动特点及它们之间夹带气体的形成机理，完成夹带气体流场的理论建模。对运动薄膜和导向辊之间夹带气体的流场进行数值模拟，结合工程实际情况分析讨论流场特性随薄膜运动速度的变化规律。结果 随着薄膜运动速度的增加，空气夹带量随之增加，楔形入口区域内流体的流动速度分布范围变大，在包角出口区域流体流出的速度增加，流程变大。结论 薄膜运动速度是影响夹带气体流场特性的主要因素，夹带气体在入口区域形成局部涡流，涡流会导致流体运动状态不稳定，进而引起薄膜产生振动。

The work aims to study the flow field characteristics of entrained air between web and guide roller at different moving speeds. The motion characteristics of web and guide roller and the forming mechanism of entrained air between them were analyzed to complete the modeling of flow field of entrained air. Numerical simulation of the flow field of entrained air between the moving web and the guide roller was carried out. In combination with the actual circumstances of the engineering, the law of flow field characteristics changing with the web moving speed was analyzed and discussed. With the increase of the web moving speed, the volume of entrained air increased accordingly and the flow speed distribution range in the wedge-shaped entrance area was enlarged. In the wrap angle exit area, the outflow speed and the flow path were increased. Web moving speed is the main factor influencing the flow field characteristics of entrained air. The entrained air forms local vortexes in the entrance area. Vortex can cause unsteady flowing state and will thus cause web flutter.