基于多孔介质的煤矿低浓度瓦斯燃烧的二维数值模拟

利用商业软件Fluent 6.3建立二维模型并进行合理设置,对基于多孔介质的煤矿低浓度瓦斯燃烧进行数值模拟,研究了入口瓦斯浓度、瓦斯流速对燃烧器轴向温度和CO2分布的影响,以及多孔介质燃烧器中速率分布情况。结果表明,不同瓦斯浓度下,随着流速的增大,最高温度位置逐渐向燃烧器出口处移动,最高温度大小也随着流速增加逐渐增大;不同瓦斯流速下,轴向最高温度随着瓦斯浓度的增加而变大,到达最高温度时的位置随浓度变大而越靠近瓦斯入口处;燃烧器中的速率分布由于受到多孔介质的影响,有明显的规律性。

2D numerical simulation of low concentration coal mine gas combustion in porous medium

The combustion of low concentration coal mine gas in porous medium was numerically simulated via a two-dimensional model by using the commercial software Fluent 6.3.The influences of gas concentration and flow velocity on the axial temperature and the CO2 distribution were studied,as well as the velocity distribution in the porous medium.The results showed that the highest axial temperature in the combustor rises with the increase of the gas flow rate under the different gas concentrations,meanwhile the position of the highest temperature moves to the exit of the combustor.Similarly,the highest axial temperature rises with the increase of the gas concentration under the different gas flow rates,and its position moves to the entrance of the combustor.The velocity distribution in the combustor presents an obvious regularity because of the influence of porous medium.