环境风对自然排烟效果的影响研究

On the Effect of the Environmental Wind on the Natural Smoke

为了研究环境风对自然排烟效果的影响,基于FDS模型对不同功率池火灾在不同风速的迎面风和背面风作用下的排烟效果进行数值模拟研究,结果表明:迎面风对侧墙排烟口的自然排烟有一定抑制作用,且风速越大抑制作用越强;背面风对侧墙排烟口的自然排烟有一定促进作用,且风速越大促进作用越明显。根据研究结果可知,在建筑设计中应充分考虑当地环境风的方向和风速,将侧墙排烟口尽量布置在背面风一侧,以在发生火灾时达到良好的自然排烟效果。

In order to investigate the effects of the environmental wind on the natural smoke by FDS based on a large eddy simulation,the different pool fires and the different environmental wind velocity of the face wind and the back wind are simulated by means of an entity FDS model. It is found that the face wind has a certain inhibition on the natural smoke,and the back wind has a certain promotion on the natural smoke. Based on the results of the analysis,the paper suggests that the architectural design process should take full account of the local environment of the wind direction and wind speed,and the sidewall smoke vents should be set up on the back side in order to improve the efficiency of the natural smoke.