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选取20 cm×40 cm和60 cm×30 cm两个开口工况对窗口溢流火燃烧现象进行试验和模拟研究。试验台基于ISO 9705全尺寸热释放速率试验台搭建,包括燃烧小室、模拟外壁面、温度测量系统和气体分析系统。结果表明,燃烧状态受通风因子影响较大。峰值热释放速率随通风因子的增大而增大,而达到峰值热释放速率的时间和燃烧持续时间呈相反的变化趋势。溢流火焰的壁面贴附效应与小室开口比率(宽高比)有关,宽开口火焰壁面贴附效应比窄开口明显。采用火灾动力学模拟软件FDS(Fire Dynamics Simulator)对试验结果进行数值模拟。模拟得到的热释放速率、溢流火焰温度分布、小室温度以及溢流火焰的壁面贴附效应与试验结果吻合较好。
The phenomenon of overflow flame combustion was investigated by two open conditions of 20 cm × 40 cm and 60 cm × 30 cm. The test bench is based on the ISO 9705 full-scale heat-release rate test bed, including the combustion chamber, the simulated outer wall, the temperature measurement system and the gas analysis system. The results show that the combustion condition is greatly affected by the ventilation factor. The peak heat release rate increases with the increase of ventilation factor, while the peak heat release rate and combustion duration show the opposite trend. The effects of the wall surface of the overflow flame are related to the cell opening ratio (aspect ratio), and the effect of the wide open flame wall is more obvious than that of the narrow opening. The fire dynamics simulation software FDS (Fire Dynamics Simulator) was used to simulate the test results. The simulation results show that the rate of heat release, the temperature distribution of overflow flame, the temperature of the chamber and the wall adhesion effect of the overflow flame are in good agreement with the experimental results.