中文摘要：

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。

英文摘要：

Aimed to optimize a low heat loss micro-combustor whose chamber wall is made of porous material, the combustion characteristics of methane/air premixed flames on porous wall surface was investigated experimentally. The results show that flat flames form at a limited range of mixture flow velocity （v） and equivalence ratio（0）. At ~〈1, The limited velocity increases when increases; When v is over upper the limited velocity, the flame-front becomes instable and irregular, and the reaction zone enlarge. To flat flames, When v and 0 increase, the radial temperature of flames increase, but the height of flames decrease, so the flames move to wall At the same time, the temperature of wall surface far away flames decrease. These characteristic of plat.flames on porous wall surface is helpful to obtain stable combustion in the smaller combustion space.