【摘要】 为研究煤矿低浓度瓦斯在蜂窝陶瓷燃烧流场内流动、燃烧、传热反应，借助数值模拟手段，建立了包含周期性条件、甲烷燃烧机理、湍流-层流流动特性的矩形微通道模型，通过对其变参数分析，解析预混气体流速、甲烷体积分数和预混气预热温度变化对蜂窝陶瓷燃烧流场的影响。结果表明：预混气体流速主要影响燃烧流场内的火焰面传播速度和最高火焰温度，速度越大，火焰面前沿的温度梯度越大；甲烷体积分数的降低导致火焰面位置明显后移，火焰面处峰值与化学反应速率明显下降，流场内的温度下降；预混气进气温度提高时，火焰的峰值温度上升，化学反应速率增大。更多还原

【Abstract】 In order to study the dynamics of low-concentration methane combustion within honeycomb ceramic structures in coal mining environments, advanced numerical simulations were employed.A model, integrating periodic boundary conditions, detailed methane combustion processes, and the interplay of turbulent and laminar flows in rectangular microchannels, was developed.The effect of premixed gas velocity, methane volume fraction, and preheating temperature variation on the combustion characteristics in these structures were investigated.The results reveal that the velocity of the premixed gas predominantly influences the rate of flame spread and the maximum temperature reached within the combustion zone, with higher velocities inducing more pronounced temperature gradients at the flame front.Conversely, decreasing the methane volume fraction results in a significant shift of the flame front towards the back, along with a marked reduction in both the peak temperature and chemical reaction rates, leading to cooler overall flow field temperatures.Furthermore, raising the temperature of the incoming premixed gas enhances the peak flame temperature and accelerates the chemical reactions involved.更多还原