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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,以甲烷/空气预混气为燃料,对多孔介质表面平面火焰形成特性进行实验研究。试验表明:在一定燃料当量比和流量范围内,多孔介质表面能够形成稳定的平面火焰。在燃料当量比小于1时,平面火焰极限范围随当量比增加而增加,过高的预混气流量时会引起平面火焰面不稳定、破裂和火焰厚度增加。形成平面火焰时,随预混气流量和当量比增加,火焰温度升高,火焰高度降低,火焰面更贴近壁面。同当量比下,预混流量越大多孔进气壁面温度越低。该火焰和壁面温度特性适合在微小空间内组织稳定燃烧。
In order to optimize the design of low heat loss micro-burner based on porous media wall surface, the methane / air premixed gas was used as fuel to study the plane flame formation on porous media. Experiments show that: in a certain fuel equivalence ratio and flow range, the porous medium surface can form a stable plane flame. When the fuel equivalence ratio is less than 1, the limit range of the planar flame increases with the equivalence ratio. Excessive flow rate of the premixed gas can cause instability of plane flame surface, rupture and increase of flame thickness. The formation of a flat flame, with the premixed gas flow and equivalent ratio increases, the flame temperature increases, the flame height decreases, the flame surface closer to the wall. With the equivalence ratio, the greater the premixed flow rate, the lower the temperature of the porous inlet wall. The flame and wall temperature characteristics suitable for stable combustion in a small space organization.