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为优化设计基于多孔介质壁面的低热损失微燃烧器结构,以甲烷/空气为预混气实验考察了预混气初始温度多孔壁面材料对多孔介质平面火焰形成、燃烧特性的影响。实验表明:在低当量比工况下(≤0.8)由于预混气初始温度升高可以有效降低多孔板对火焰的影响(热损失),可以有效地拓宽平面火焰形成范围。当量比较大时(>0.8),由于甲烷在多孔板内部消耗,多孔表面火焰温度反而下降。不同材料的多孔板对火焰的影响主要由于导热系数差异引起,而且在火焰温度较低的时候明显。当火焰温度较高时几乎没影响。导热系数越小,多孔介质壁面温度越低。
In order to optimize the structure of low heat loss micro combustor based on porous media wall surface, methane / air as premixed gas experiment was used to investigate the effect of initial wall temperature of premixed gas on flame formation and combustion characteristics in porous media. The experimental results show that the effect of the porous plate on the flame (heat loss) can be effectively reduced due to the increase of the initial temperature of the premixed gas under the low equivalence ratio (≤0.8), which can effectively broaden the formation range of the planar flame. When the equivalent ratio is relatively large (> 0.8), the flame temperature on the porous surface decreases due to methane being consumed inside the porous plate. The effects of porous plates of different materials on the flame are mainly due to differences in thermal conductivity and are evident at lower flame temperatures. When the flame temperature is almost no effect. The smaller the thermal conductivity, the lower the temperature of the porous medium wall.