水幕排烟系统对烟气控制及排烟效率的影响研究

为探明水幕排烟系统对隧道内烟气控制和排烟效率的影响,通过火灾动力学求解器(FDS)研究不同排烟风量下隧道内烟气、温度和速度分布.结果 表明:排烟量小于100 ma/s时,水幕无法有效地阻隔有毒烟气的蔓延;当火源热释放速率(HRR)为10、20及30 MW时,排烟量分别为100、160和180 m3/s,能将烟气限制在水...

Study on influence of water curtain smoke exhaust system on smoke control and exhaust efficiency

In order to explore influence of water curtain smoke exhaust system on smoke control and exhaust efficiency in tunnels,smoke spread,temperature and velocity distribution were studied for different smoke exhaust volume by utilizing fire dynamics solver(FDS).The results show that water curtain can’t effectively block spread of toxic smoke when the exhaust volume is less than 100 m3/s.And in cases of 10,20 and 30 MW for heat release rate and 100,160 and 180 m3/s respectively for smoke exhaust volume,smoke can be contained the water curtain system.With help of water curtain,temperature distribution outside it can meet needs of people to escape(less than 80℃),and smoke control is more important than temperature control in the system.While at the same fire source heat release rate(HRR),smoke exhaust efficiency of vents increases first and then decreases along with smoke volume.Moreover,suction effect of vents is difficult to form,and the main reason for low smoke exhaust efficiency is that smoke inhaled by vents at bottom of tunnels is mixed with a lot of fresh air.