某物流中心中庭风幕取代防火卷帘的数值模拟

利用FDS模拟某物流中心中庭火灾场景中风幕的挡烟效果。中庭高32m,顶部有6个机械排烟口,总排烟量为240000m3/h。火源功率为4MW,快速t2火位于中庭下方。机械排烟系统和风幕系统均在火灾开始后60s时启动。风幕风速分别为0、0.5、1、2、3和4m/s。模拟结果:当风速低于1m/s时,挡烟效果不明显;风速高于3m/s会妨碍排烟系统的排烟效果。2m/s风速既能发挥风幕的挡烟效果,又不使烟气在下层积聚。结论:设置合理风速的风幕在一定程度上可取代防火卷帘。

Numerical simulation of the air curtain taking the place of the fire resisting shutter at some logistical center

The damping smoke effect of the air curtain in atrium fire scenario of a distribution center is simulated by FDS. The altitude of the atrium is 32 m and there are 6 mechanical smoke exhaust exits on the roof. Total smoke exhaust quantity is 240 000 m3/h . The power of ignition source is 4 MW. The t2 growing fire locates beneath the atrium . After fire continues for 60 s, the mechanical smoke exhaust system and the air curtain system start up. The wind speed of the air curtain is 0, 0.5 m/s, 1 m/s, 2 m/s, 3 ...