【摘要】 选取单室模型,在长边侧边中间位置设通风口,针对不同水平高度的通风开口条件,利用FDS模拟研究开口水平高度对火灾热释放速率、烟气温度分布和通风量的影响。研究发现,随着开口水平高度的降低,火源热释放速率呈现下降趋势,热烟气层呈现增厚趋势,通风量减小。通过数据拟合得到在开口无量纲高度为0.6时,开口进气量达到最大值。根据氧耗原理分析得到火源的燃烧效率随着开口降低而增大。更多还原

【Abstract】 The ventilation condition is one of the key points of enclosure fire researching.By the use of fire dynamics simulator(FDS),this paper,focusing on the different horizontal height of vents in the middle of long side of a single room,studied the impact on the heat-release-rate,the distribution of smoke temperature and the mass flow rate of air through the vent.With the horizontal height of vent decreasing,the heat release rate decreased and the mass flow rate decreased and the smoke layer became thicker.By date fitting,we found that when the dimensionless height of the vent was 0.76,the mass flow of air into the enclosure attained the maximum.The efficient of combustion increased with the decrease of the horizontal height of vent according to the oxygen consumption principle.更多还原