薄膜生产线热风系统的数值模拟

Numerical simulation of hot air system of film production line

热风系统给风场的稳定性和均匀性对薄膜生产造成关键影响。为了研究现有薄膜热风系统中的空气流动情况,本文采用数值模拟的方法,在常温常压环境和风机转速为1 600 r/min条件下,计算得到了系统组件在工作过程中的风速和风压的流场情况,并做了分析。研究结果表明:气流在风箱中运动带有较强烈的湍动,并在风箱尽头的壁面产生了回旋,中间气垫层的速度分布并不均匀,气垫层的速度偏差最大达到了5.8m/s,中间气垫层的压力分布也不均匀,距离进风端越远压力越大,气垫层的压力最大偏差达到37 Pa,斜向孔以及风箱之间的间隔对气垫层的速度和压力分布有一定影响。

The stability and uniformity of hot air system wind field cause critical impact on film production. In order to study the air flow of existing film hot air system, we use numerical simulation method, under conditions of normal temperature environments and fan speed of 1600 r/min, calculate the flow field of wind speed and air pressure of the system components during operation, and make analying. The results show that： the wind flows in the wind box motion with a relatively strong turbulence, and has a whirling at the end wall of the dir box. The speed of the intermediate cushion layer is not evenly distributed, the Max. deviation of the speed is 5.8 m/s, the pressure of the intermediate cushion layer is not evenly distributed either, The longer the distance from inlet side, the greater the pressure, the Max. deviation of the pressure reaches 37 Pa. Oblique holes and spacing between air boxes have a certain effect on the speed and pressure distribution of cushion layer.