瓦斯爆炸过程中火焰传播规律的模拟研究

Numerical Simulation Research on Flame Transmission in Gas Explosion

在模拟实验和数值计算的基础上 ,研究了瓦斯爆炸过程中火焰传播规律及其加速机理 .研究结果表明 ,障碍物对瓦斯爆炸过程中火焰传播规律有重要影响 .障碍物的存在将使瓦斯爆炸过程中火焰的传播速度迅速提高 .瓦斯爆炸时 ,火焰阵面附近温度较高 ,阵面前附近区域温度梯度变化较大 ,阵面后区域的温度变化较小 .障碍物附近温度很快上升到最大值 ,然后由于化学反应结束及管道壁吸热 ,温度开始下降 .在火焰传播通道上设置的障碍物对气相火焰具有加速作用 。

Through lab experiment and numerical computation, the flame transmission and its acceleration mechanism in gas explosion were researched. Results show that barriers have a great influence on the flame transmission. When there are barriers, the velocity of flame transmission increases very quickly. Temperature gradients in flame front areas change quickly but smoothly in back areas when gas explosion happens. The high temperature will appear in the nearby barriers and decrease later because of the end of chemical reaction and the absorption of heat by the wall of the experiment tube. When there are barriers on the road of transmission, flame will be accelerated. The mechanism of acceleration is due to the positive feedback of turbulent combustion caused by barriers.