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针对某公路隧道采用集中排烟方式的工程实际,为了分析纵向诱导风速对隧道火灾烟气控制效果的影响规律,进而确定可能的火灾场景时的合理纵向诱导风速,采用火灾动力学模拟软件FDS构建了数值分析模型,并设计了相应的火灾工况。根据隧道实际交通流量、车辆类型及公路等级,确定了模拟火灾规模。分别分析了火灾规模为50MW时隧道内不同火源位置(排烟阀打开段中部、上游1个/下游5个排烟阀、上游2个/下游4个排烟阀),不同排烟方式下(双向均衡排烟、上游端单向排烟、下游端单向排烟),不同纵向诱导风速情况时的隧道2m高处能见度、烟气蔓延范围及排烟效率,根据模拟分析结果,进而确定了不同火灾工况时的合理纵向诱导风速。结果表明:不同纵向诱导风速对集中排烟模式下烟气控制效果影响显著;特定火灾规模时,火源位置、排烟方式对合理纵向诱导风速的影响不大。
In order to analyze the effect of longitudinal induced wind speed on the control effect of tunnel fire flue gas, and to determine the reasonable longitudinal induced wind speed in a possible fire scenario, a fire dynamics simulation software FDS was constructed Numerical analysis of the model, and designed the corresponding fire conditions. According to the actual traffic volume of the tunnel, the type of vehicle and the grade of the highway, the simulated fire scale was determined. The fire location of different fire sources in the tunnel (fire extinguishing valve middle part, upstream 1 / downstream 5 exhaust valves and upstream 2 / downstream 4 exhaust valves) were respectively analyzed when the fire scale was 50MW. Different exhaust modes (Two-way equilibrium exhaust, one-way upstream exhaust, downstream exhaust one-way exhaust), different longitudinal induced wind tunnel visibility at 2m, the scope of flue gas spread and smoke extraction efficiency, and then determine the results of simulation Reasonable longitudinal induced wind speed under different fire conditions. The results show that the different longitudinal induced wind speeds have a significant effect on the flue gas control effect under the centralized exhaust mode. When the specific fire scale is used, the location of the fire source and the exhaust mode have little effect on the reasonable longitudinal induced wind speed.