瓦斯爆炸过程中火焰传播规律的模拟研究

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 ,加速作用的机理主要是由于障碍物诱导的湍流区对燃烧过程的正反馈造成的

Numerical Simulation Research on Flame Transmission in Gas Explosion

Through lab experiment and numerical computation, the flame transmission and its acceleration mechanism in gas explosion were researched. The result shows 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 and back areas change respectively quickly and smoothly when gas explosion happens. The high temperature will be in the nearby area of the flame front and temperature will reach the maximum nearby barriers and decrease because of the end of chemical reaction and the absorption of heat by the wall of the experiment tube. When there are barriers in the road of transmission, flame will be accelerated. The mechanism of acceleration is to the positive feedback of turbulent combustion caused by barriers.