喷淋作用下地铁站台烟气流动模拟研究

以某典型地铁站台为研究对象，采用FDS数值模拟方法，分析喷淋系统和排烟系统耦合作用下地铁站台的火灾烟气流动，探讨了喷淋和排烟口高度对站台排烟控制的影响。结果表明：喷淋开启后会诱发喷淋区域内的火灾烟气沉降，能见度低于10 m, 对火源附近的人员疏散不利；而喷淋对火灾烟气的冷却卷吸作用有助于减弱烟气沿站台纵向蔓延动量，有利于喷淋区域外的人员疏散；排烟口高度越高排烟效果越好，但对喷淋区域内能见度的改善效果不显著。

Numerical study of smoke movement on subway platform under the effects of water sprinkler

Focusing on a typical subway platform,the fire smoke behavior under combined effects of a water sprinkler system and a smoke exhaust system has been simulated by means of FDS.The impact of the height of smoke vent on the smoke exhaust has also been discussed.The results showed that the sprinkler system can induce the smoke moving downward inside the sprinkler zone and the visibility was reduced to less than 10 m,which dangers the evacuators around the fire location;on the other hand,the cooling and entrainment effect of water sprinkler is able to reduce the smoke momentum spreading along the platform which benefits the evacuators outside the sprinkler zone;the smoke exhaust efficiency is higher with the vent height,but its impact is limited to the sprinkler zone visibility.