壁面材料对微火焰熄火影响的实验研究  

Experimental Study of the Influence of the Wall Surface Material on the Extinguishment of a Microscale Flame

作　　者：冯耀勋[1] 杨浩林[2] 赵黛青[2] 

机构地区：[1]广东海洋大学工程学院,广东湛江524088 [2]中国科学院广州能源研究所,广东广州510640

出　　处：《热能动力工程》2013年第1期61-67,110-111,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51006109);广东海洋大学引进人才科研启动基金资助项目(1212099);湛江市科技攻关计划基金资助项目(2012C3101002;2012C3103006)

摘　　要：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 premixed methane/air flame produced by a burner located in a slot between two parallel test plates was used to investigate the influence of the wall surface material on the extinction of a microscale flame.The test results show that the interval of the two plates causing a flame failure is relating to the material and meanwhile will decrease with an increase of the wall surface temperature.The surface structure and composition of the material under the test before and after the combustion were analyzed by using the X-ray diffraction(XRD) and X-ray photoelectron spectrum(XPS).It has been found that the proportions of oxygen chemically adsorbed by various surfaces made by various materials can be listed out from high to low:zirconia ceramics,silicon plate and stainless steel 304.The intervals of two plates made by using these three kinds of material causing a flame failure can be given from small to large:zirconia ceramics,silicon plate and stainless steel 304,both having an identical variation tendency.The oxygen chemically adsorbed by the material surface plays an important role in chemical flame extinction.At a same wall surface temperature,the less the amount of oxygen chemically adsorbed by the material surface,the more conspicuous the chemical flame extinguishment role.It has been found during the test that the surface roughness may influence the adsorption characteristics of the material surface and give rise to different chemical flame extinguishment characteristics.

关 键 词：微火焰 化学熄火 熄火距离 化学吸咐氧 壁面材料 

分 类 号：TK16[动力工程及工程热物理—热能工程]