湍流的诱导及对瓦斯爆炸火焰传播的作用

对巷道面积突变和巷道分叉对瓦斯爆炸过程中火焰传播速度的影响进行了试验研究。并利用加速环研究了巷道支架对瓦斯爆炸传播规律的影响，在此基础上对湍流的形成过程进行了理论分析。研究结果表明，管路分叉，面积突变对瓦斯爆炸过程中火焰传播规律有重要影响，导致产生附加湍流，使瓦斯爆炸过程中火焰的传播速度迅速增大；在管道内装加速环，将使瓦斯爆炸过程中湍流度加剧，火焰的传播速度更大，激波生成的位置。最大点位置前移。强度增大，研究结果对指导现场防治瓦斯爆炸和减轻瓦斯爆炸的威力具有重要作用。

Inducement of Turbulence and Its Effect on Fire Transmission in Gas Explosion

Through lab experiments, the effects of change in tunnel section and its branching on fire transmission in gas explosion was investigated, and the action of tunnel supports on fire transmission was also discussed. Based on the experiment results, the formation of turbulence in gas explosion was theoretically analyzed. The research result shows that the expansion wave, induced by the branching of a tunnel and the sudden increase of its section, and the heat effect of its surface will result in the decrease of the speed of fire transmission in gas explosion, while the heat effect produced between tunnel's inner wall and fire surface and the compressive wave induced by the sudden decrease of tunnel's section will make it increase. When there is an acceleration ring in a test pipe, the fire speed increases, the positions of the shock wave, induced by the sudden change of pipe's section and the supper\|pressure, and its maximum speed move forward, and the intensity of the shock wave increases. These results are useful to the prevention of gas explosion in coal mines.