孔隙密度对多孔介质燃烧器燃烧特性影响

Effect of void density on combustion characteristics of porous medium burners

建立多孔介质燃烧器的数学物理模型,运用Fluent模拟软件对其进行数值计算,研究多孔介质孔隙密度变化对燃烧特性和污染物排放的影响。结果表明:随着孔隙密度增大,火焰区域会逐渐往下游移动;沿着流动方向孔隙密度从10 PPI逐渐增大到45 PPI的变化结构更有利于热量传递,相较于其他孔隙密度分布其燃烧特性更好,氮氧化物生成量也相对较低,径向方向孔隙密度内部加密结构有更高的燃烧温度和稳燃上限。

The mathematical-physical model of the porous media combustor was established,and numerical calculations were carried out using the Fluent simulation software to study the effects of changes in the porosity of the porous media on the combustion characteristics and pollutant emissions.The results show that as the pore density increases,the flame region gradually moves downstream.Along the flow direction the pore density from 10PPI gradually increases to 45PPI,and this changing structure is more conducive to heat transfer.Compared with other pore density distribution,it has better combustion characteristics,the NO_(x)generation is relatively low,and in the radial direction the internal encryption structure has higher combustion temperatures and the upper limit of stable combustion.