火源高度不同时隧道顶棚射流温度特性的实验研究

通过对隧道火灾相似比例尺寸的实验模拟,结合随着着火点高度不同时,池火质量损失速率、火羽流的热反馈速率与池火的热释放速率之间关系的理论基础,分析了随着隧道内着火点高度的变化,对隧道顶棚温度、燃料的质量损失速率、火源功率、吸收的热反馈、顶棚火焰撞击区半径的影响以及变化的规律,得出随着火源高度的增加,燃料的衰减速率、热反馈与火源功率均增大,顶棚射流半径也有所变化。

Experimental Study on the Characteristics of Tunnel Ceiling Jet Temperature in Different Heights of Fire Source

By the similar proportion experimental simulation of the tunnel fire,in conjunction with the theoretical basis of relationship among pool fire mass loss rate,the heat feedback rate of fire plume and pool fire heat release rate,when the heights of ignition points are different,the paper analyzes that the impact and changing laws of the various of ignition points on the tunnel ceiling temperature,fuel mass loss rate,fire power,absorbing heat feedback and the ceiling flame impingement zone radius.The paper concludes that the fuel mass loss rate,the heat feedback and the fire power are increasing with the increasing of fire source height.