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建筑火灾中的火源多为固体可燃物。该文基于固体可燃物热解动力学模型,对多室内聚氨酯泡沫(PUF)板热解与空间火蔓延及烟气运动的相互作用进行了大涡数值模拟。计算得到的PUF板质量变化速率和各房间内烟气温度及CO2与O2浓度随时间的变化与实验基本相符合。CO2浓度随时间变化达到的峰值在着火房间最高,在邻近房间较低。O2浓度随时间变化达到的谷值在着火房间最低,在邻近房间较高。烟气温度和浓度峰值与谷值的出现与PUF板质量变化速率的峰值有关。
Most of the fires in the building fire are solid combustibles. Based on the pyrolytic kinetic model of solid combustibles, a large-eddy numerical simulation of the interaction between pyrolysis of multi-room polyurethane foam (PUF) panels and space fire spread and smoke movement was carried out. The calculated rate of change of mass of PUF board and the change of flue gas temperature and the concentration of CO2 and O2 in each room with time basically accorded with the experiment. The peak of CO2 concentration over time is highest in the fire room and lower in the adjacent room. The lowest value of O2 concentration over time is lowest in the fire room and higher in the adjacent room. The appearance of flue gas temperature and concentration peaks and valleys is related to the peak value of the rate of change of PUF board quality.