不同火源功率下地下环道火羽流运动机理研究

Research on fire plume entrainment characteristics of underground ring road under different HRR

为研究地下环道不同火源功率下火羽流卷吸特性机理,采用数值模拟结合理论分析,设置9个典型火灾场景,定量分析火羽流温度场、烟羽流高度变化等卷吸特性。得出结论认为,火源功率对温度场影响最大,对烟气层高度影响较小;火源位于主干隧道火灾危险性最高,该位置发生火灾时不同火源功率下的温度、烟气层高度均达到人员疏散危险值。研究可补充现有受限空间的火灾动力学理论,为地下受限空间烟气控制、人员疏散及火灾综合防治提供理论依据。

In order to study the mechanism of the entrainment of fire plumes under different heat release rate in underground ring road, this paper uses numerical simulation and theoretical analysis to set up nine typical fire scenarios to quantitatively analyze the temperature and height of the smoke layer, etc. The study shows,HRR has the greatest impact on the temperature field, and has little effect on the height of the smoke layer. It has the highest fire risk and both the temperature and height of the smoke layerhave hit dangerous level when the fire source located in the main tunnel.This study can supplement the existing limited-space fire dynamics theory and provide theoretical basis for smoke control,personnel evacuation and fire prevention and control in underground confined space.