涂装烘干工艺车间风幕特性研究

Aerodynamic Performance Investigation on Air Curtain of Vehicle Drying Chamber

针对涂装高温烘干室车辆连续进出操作的需求,在进口处设计一种隔断内外空气泄漏的顶吹式风幕。利用数值仿真的方法,研究某顶吹风幕热力参数对密封效果和节能特性的影响规律。研究结果表明:随着风幕入射角度的增大,实现密封效果所需要的最小风速有所降低;尽管提高风幕入射角度,所对应的最小密封风速较低,但是车间入口处的温度明显提高,热能浪费严重;此外,相比入射风速变化的影响,风幕入射角变化对密封效果的影响更为显著。在无车辆进出条件下,风幕入射速度为12 m/s、入射角度为45°时,可以同时达到较好的密封和节能效果。

A top injection air curtain was designed to stop air leakage due to vehicle continuous movement in and out of painting drying chamber.A numerical simulation was performed to study the influences of the air curtain structure parameters on the sealing effect and energy saving performance of drying chamber.The results showed that the minimal air curtain velocity required for sealing effect decreased as the injection angle increased.Despite the optimal injection angle and injection velocity,the chamber entrance temperature increased remarkably causing serious thermal energy dissipation.In contrast to injection velocity,air curtain velocity had more significant impact on sealing effect.With no vehicle in&out movement,the better sealing effect and energy conservation performance could be accomplished when air curtain velocity was adjusted at 12 m/s and injection angle at 45°.