Theoretical model of air curtain with serials-parallel fans and experimental study

Based on effective pressure theory without air partition and jet flow theory, the theoretical model of airflow being ejected by serials-parallel air curtain was set up and analyzed the influencing factors through numerical simulation. Meanwhile, according to the condition that inverted air current and insufficient air volume in transportation laneway in some iron mines, the experiment on air flow being ejected by serials-parallel air curtain was carried out through contrast experiment. The results show: (1) The serials-parallel air curtain can effectively eject air flow and the air volume can reach 24.3 m3/s~36.8 m3/s, which enhances the driving visibility in laneway and thus facilitating safety driving of trackless diesel vehicle and workers’ health underground; (2) The influence degree of air curtain on air volume of main fans is about 0.6%, by which the air flow being ejected is favorable for order flow in the laneway. (3) The running noise of serials-parallel air curtain was 76~92 dB (A), which is less interfered with the working environment near by 300 m. Moreover, the time of workers being exposed to the noise is short, so the damage degree is low. (4) The serials-parallel air curtain is installed in chambers on the two sides of laneway, which does not affect the pedestrian and the traveling of trackless diesel vehicle.