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采用了两平行测试板间狭缝燃烧器产生的甲烷/空气预混火焰来考察材料对微火焰熄火的影响。实验结果表明,熄火距离与材料有关,同时随着壁面温度的升高而减小。燃烧前后测试材料的表面结构以及组成采用了X射线衍射(XRD)以及X射线光电子能谱(XPS)进行分析,结果表明不同材料的表面化学吸附氧的比例从高到低排列顺序为氧化锆陶瓷、硅片以及304不锈钢,这3种材料的熄火距离从小到大排列顺序分别为氧化锆陶瓷、硅片和304不锈钢,两者变化趋势一致。表面化学吸附氧对化学熄火起到重要作用,在相同的壁面温度下,材料表面的化学吸附氧越少,化学熄火作用越显著。实验还发现,表面粗糙度会影响材料表面的吸附特性而产生不同的化学熄火特性。
A methane / air premixed flame produced by a slit burner between two parallel test plates was used to examine the effect of the material on the flameout of the micro-flame. The experimental results show that the flameout distance is related to the material, and decreases as the wall temperature increases. The surface structure and composition of the tested materials before and after combustion were analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that the proportion of surface chemisorbed oxygen on different materials was in descending order of zirconia ceramics , Silicon and 304 stainless steel, the flameout distance of these three kinds of materials are arranged in ascending order of zirconia ceramics, silicon and 304 stainless steel, the trend of the two changes. Surface chemical adsorption of oxygen play an important role in chemical flameout, the same wall temperature, the surface of the chemical adsorption of oxygen less, the more obvious chemical flameout. The experiment also found that the surface roughness will affect the adsorption characteristics of the material surface and produce different chemical flameout characteristics.