公路隧道集中排烟系统流速分布规律数值模拟研究

采用火灾动态模拟软件FDS,对独立排烟道集中排烟模式在火灾条件下的排烟情况进行模拟计算,分别研究了集中排烟中双向排烟方式和单向排烟方式下不同排烟阀设置方案工况的排烟道流速和排烟阀流速分布规律.结果表明,双向排烟方式下,排烟阀流速与排烟道流速呈对称分布；单向排烟方式下,排烟阀流速与排烟道流速呈非对称分布；当排烟道横截面面...

Numerical Simulation Study on System Velocity Distribution Law of Central Exhaust Mode in Highway Tunnel

System velocity distribution law of central exhaust mode with independent smoke exhaust duct in highway tunnel is investigated in this paper.The fire dynamics simulation software FDS is used to simulate tunnel fire under the central exhaust mode.The simulation cases include bidirectional exhaust condition,unidirectional exhaust condition and different smoke exhaust valve setup plans.The velocity distribution law of smoke exhaust duct and smoke exhaust valves is studied.According to the research,the velocity of smoke exhaust duct and smoke exhaust valves presents symmetric distribution under bidirectional exhaust condition,and presents asymmetric distribution under unidirectional exhaust condition.While the cross section of smoke exhaust duct is fixed,changing the setup plan of smoke exhaust valve has little effect on the velocity of the end of smoke exhaust duct.With the increase of opening area of smoke exhaust valve,the velocity of smoke through exhaust valve,which is near the fan,gradually decreases,but the smoke exhaust rate of this valve gradually increases.The velocity distribution of smoke exhaust duct and smoke exhaust valves depends on the smoke exhaust rate,the setup plan of smoke exhaust valve,the cross section area of smoke exhaust duct,etc.This paper provides a basis and reference for the reasonable design of system velocity of central exhaust mode in highway tunnel.