室内可燃气体泄漏过程中的着火与火焰蔓延

采用小尺度箱体及液化石油气模拟室内燃气泄漏的条件,通过电火花点火,实验研究了在燃气泄漏过程中的着火与火焰蔓延的现象与规律.实验结果表明,火焰首先在燃料燃烧的浓限和稀限之间的可燃区域传播,并且在化学恰当比附近区域的传播速度最大,因此燃气的动态浓度场决定了火焰蔓延的形状.并表明可燃区域是一个逐渐发展的区域,最终其高度与窗沿高度相当,在此区域内点火最容易成功,因此是气体燃料泄漏后发生火灾的最危险的区域.实验结果还揭示了在火焰蔓延过程中,存在着由火焰面推进传播向空间整体燃烧过渡的现象.

Fire and Flame Spread During the Process of Indoor Flammable Gas Leakage

Using little scale trunk and LPG to simulate the condition of indoor flammable gas leakage,an experimental study was performed on the fire and flame spread ignited by electric sparkle.The experimental result shows that the flame spreads first in the combustibility area from density limit to sparseness limit and the maximum velocity of flame spread occurs at the area of suitable rate of PLG and air chemistry mixture.So the dynamic consistence field of flammable gas determines the flame spreading shape.And it also shows that the flammable area is a gradually developing area and the height corresponds with the windowsill finally.The easiest ignition shows the most dangerous area when the gas fuel leaking.The experimental result also shows the transition phenomenon that the flame surface pushes the spread to the whole-space combustion.