为研究不同通风条件对受限空间内可燃物燃烧时温度、压力、风速的影响,采用FDS 数值模拟的方法,通过在受限空间火灾场景下设置不同的过流断面,对室内温度、烟气层高度、窗口处压力和流速进行模拟分析。结果表明,随着过流断面的增大,进风面积逐渐增大,烟气层逐渐升高,烟气层温度逐渐降低,窗口处压力和流速随着高度的增加呈现先增加后减小趋势。研究结果证明了受限空间火灾如果处于通风不良状态时,应尽量不要改变室内通风条件,以便减小火灾影响,为受限空间现场处置、应急救援方法制定和火灾防治奠定了基础。

To study the influence of different ventilation conditions on the temperature, pressure, and windspeed of confined space fire, the large eddy numerical simulation method of FDS software is used to analyzethe temperature, smoke layer height, pressure, and flow velocity at the opening of the confined space by set⁃ting different door opening angles in the confined space fire scenario. The results show that with the increase ofthe door opening angle, the ventilation area gradually increases, the flue gas layer gradually increases, and theflue gas layer temperature gradually decreases. The pressure and flow rate at the opening first increase andthen decrease with the increase of the height. The research results prove that if the confined space fire is in apoorly ventilated state, the behavior of improving indoor ventilation conditions should be avoided, to reducethe impact of fire and provide a reference for fire prevention methods in confined spaces.