多孔介质内低浓度瓦斯燃烧温度的分布规律

Distribution rule behind low concentration gas combustion temperature in porous media

为研究多孔介质燃烧器内瓦斯燃烧特性及二维能量分布规律,采用Fluent数值分析方法,建立多孔介质燃烧器二维模型,分析瓦斯在不同流速、体积分数条件下,燃烧器内温度与能量分布规律。结果表明,随着气体流速和瓦斯体积分数的增大,燃烧器轴向最高温度增大,且最大能量集中点向出口方向移动。该规律由温度二维等值线云图可直观看出。燃烧器内换热管应集中布置在轴向45～60 mm内,分散设置在30～140 mm内。该研究为多孔介质内换热元件布置提供了参考。

This paper aims to investigate the characteristics behind the gas combustion and the law governing two-dimensional energy distribution in a porous medium burner.The research involves developing a two-dimensional model of porous medium burner using Fluent numerical analysis method and thereby analyzing the characteristics behind energy distribution and gas combustion in the burner with different flow rates and volume fractions.The results demonstrate that along with an increase in gas flow rate and gas concentration come an increase in the maximum axial temperature of the burner and movement of the maximum energy concentration point towards the outlet direction-a law which can be seen directly from the two-dimensional cloud map of temperature;the heat exchanger tubes should be designed to be centrally arranged within 45-60 mm and dispersed within 30-140 mm.This study could provide a reference for the layout of heat exchangers in porous media.