基于FLUENT数值模拟的高层建筑排烟方式

Extraction way of fire smoke in high-rise buildings based on FLUENT numerical simulation

以FLUENT模拟高层建筑单层消防排烟方式对火灾发生时温度以及烟气分布的影响。分别对三种火灾排烟工况进行模拟,对于每一种工况都截取了60s和180s时的结果。通过数值模拟发现,在自然排烟、正压排烟以及负压排烟三种排烟模式下,火灾发生180s时温度最高分别达到820、752、769K,烟气质量分数最高分别达到0.028、0.013、0.019,由此可以看出正压排烟效果比较好。

Taking FLUENT numerical simulation for the technical support,it researched on the influence of extraction way of fire smoke on the temperature and smoke distribution in the fire smoke of high-rise buildings.Three scenarios of smoke exhaust were set in the simulation and the results of 60 s and 180 s were obtained.Numerical simulations showed that the temperature were respectively up to 820 K,752 K and 769 K,and the highest concentration of flue gas respectively reached 0.028,0.013 and 0.019 under the three following mode：natural smoke exhaust,positive pressure smoke exhaust and negative pressure smoke exhaust,at 180 s after the ignition of fire.So we could draw the conclusion that the effect of positive pressure ventilation was better than others.