【摘要】 针对矩形火羽流的燃烧特征进行了实验研究,着重分析了火源长宽比的影响.结果表明:矩形火羽流的火焰高度受到火源长宽比和热释放速率的耦合影响.基于空气卷吸理论推导了火焰高度的预测表达式,可以计算不同热释放速率和长宽比下的火焰高度.矩形火羽流的轴向温度分布整体上类似于经典的火羽流温度分区规律.相同热释放速率下,连续火焰区的峰值温度随长宽比的增加先增后减,而羽流区的温度衰减速率随长宽比的增加而降低.更多还原

【Abstract】 The combustion characteristics of rectangular fire plume were experimentally studied,with emphasis on the influences of the aspect ratio of the fire source. Results show that the flame height of the rectangular fire was jointly affected by the aspect ratio and heat release rate of the fire source. Based on the theory of air entrainment,a predictive expression of flame height was derived,which can estimate the flame height under different heat release rates and aspect ratios. The axial temperature distribution of the rectangular fire plume was similar to the classic temperature distribution in conventional round fires. Under the same heat release rate,the peak temperature in the continuous flame region first increased and then decreased with the increase in the aspect ratio,while the temperature decay rate in the plume region decreased with the increase in the aspect ratio.更多还原