瓦斯爆炸过程中火焰厚度测定及其温度场数值模拟分析

Computer Simulation on the Temperature Field of Gas Explosion and Lab Measurement for the Flame Thickness

本文通过实验的方法 ,探讨了瓦斯爆炸过程中火焰厚度变化特性及其影响因素 ,并对瓦斯爆炸过程中的温度场变化进行了数值模拟 .研究结果表明 ,当有障碍物存在时 ,瓦斯爆炸过程中产生的火焰厚度常常会小于无障碍物存在时所产生的火焰厚度 ;膜片所处位置对瓦斯爆炸过程中火焰厚度也有重要影响 ,膜片距离爆炸源较近时 ,火焰厚度明显增大 .瓦斯爆炸后 ,火焰阵面前附近区域与管封闭端附近区域温度变化较为陡峭 ,而火焰阵面后一段区域的温度变化较平缓 ,且火焰阵面附近温度较高 ,在障碍物附近温度很快上升到最大值 ,然后温度开始下降 .研究结果对指导现场防治瓦斯爆炸 。

The flame thickness in gas explosion were investigated by a lab explosion, and the temperature field in the experiment was observed by computer simulation. The result shows that the barriers and plastic film used in the experiment have a great influence on the flame thickness. When barriers exist, the flame formed in gas explosion would decrease in thickness, and when the plastic film is near the explosion source, the flame would increase in thickness. It is aslo found that the maximum temperature happened near the barriers, and then, the temperature would decrease.