关键词: 瓦斯爆炸, 当量比浓度, 数值模拟, 火焰传播

Abstract: In this paper, to research the propagation rule and inherent mechanism of premixed flame in pipeline, we established the mathematical model and physical model by using numerical simulation method, and conducted simulation research on the process of mine gas explosion in different gas content. The calculation results show that both the velocity and pressure in gas explosion process experience the stages of “rise - fall - second wave - fall - swing”. In the initial stage of the flame propagation, the deflagration volume of gas increases rapidly, and the velocity, pressure and temperature of the flame also rise up quickly, and present laminar burning state during a certain time. Then, both the velocity and pressure have appeared swings in various degrees, which are the results of concurrent effects of pressure wave and reflected wave. Meanwhile, the velocity of the flame achieves the peak value ahead the pressure, this is mainly attributed to the superimposition of explosion pressure wave and reflected pressure wave, which leads to the rise of pressure, while the reflected pressure wave leads to the decrease of ve-locity. The best content of mine gas is that the velocity and pressure are in the minimum value, and the gas burning lasts the longest time, in this time the mine gas hasn’t been completely accelerated, and haven’t formed the detonation state.

Key words: gas explosion, gas content, numerical simulation, flame propagation