基于环境风作用下坡地建筑火灾烟气流动影响研究

Research on the Influence of Smoke Flow in Building Fires on Slopes Based on the Influence of Ambient Wind

摘要: 为探究环境风作用下对坡地建筑火灾烟气的影响，本研究通过Pyrosim软件构建了坡地建筑模型进行火灾模拟，并在此基础上增加环境风条件，分析了火灾烟气蔓延规律、建筑物温度、CO浓度等变化规律。研究结果表明：在环境风的作用下，在坡地上的某建筑发生火灾时，风速的增加对于坡地建筑群火灾烟气横向蔓延起到了促进的作用，但对于火灾纵向向下蔓延起到了抑制作用，但对于着火建筑来说，由于风速的升高对于火灾烟气纵向向下蔓延起到了抑制的作用，随着风速的升高烟气的横向蔓延大于纵向蔓延，烟气在室内造成集聚，导致建筑内峰值温度上升。此次研究可以为坡地建筑灭火救援和人员紧急疏散以及坡地建筑的建设方案提供一定的理论依据。

Abstract: In order to explore the impact of environmental wind on fire smoke in sloping buildings, this study used Pyrosim software to construct a sloping building model for fire simulation. Based on this, environmental wind conditions were added to analyze the laws of fire smoke spread, building temperature, CO concentration, and other changes. The research results indicate that under the influence of environmental wind, when a fire occurs in a building on a slope, the diffusion speed of fire smoke is positively correlated with the environmental wind speed, and the generated fire smoke has a greater impact on other buildings on the slope, while the impact on buildings below the slope is relatively small; Under the influence of local wind direction, the flow pattern of fire smoke significantly changes. The fire smoke spreads towards the upper side of the burning building in the downwind direction with the wind direction, and the faster the wind speed is, the faster it spreads. This study can provide some theoretical guidance for fire fighting and rescue of sloping buildings, Emergency evacuation of personnel and construction scheme of sloping buildings.