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甲烷反扩散火焰光谱特性实验研究
王宝璐,额日其太
(北京航空航天大学 能源与动力工程学院,北京 100191)
摘要:
为了研究层流甲烷反扩散火焰的光谱特性,采用光纤光谱仪对层流甲烷/空气反扩散火焰中发射谱线分别为314nm和430nm的激发态自由基OH*和CH*进行了光谱特性实验研究,分析了OH*,CH*辐射强度随空气喷嘴出口Re数的变化规律,及其沿反扩散火焰轴向与径向的分布特征。研究表明:甲烷反扩散火焰具有明显的内外双层结构,OH*和CH*辐射强度沿火焰轴向与径向均呈现先增后减的趋势。随着空气流量增大,OH*,CH*分布范围变大,并逐渐向火焰下游扩展。在距喷嘴出口5mm处出现OH*和CH*辐射强度峰值,且峰值的轴向位置不随空气流量增大而改变。
关键词:  反扩散火焰  光谱特性  辐射  实验研究
DOI:
分类号:
基金项目:
Experiment Study of Inverse Methane/Air Diffusion Flame Emission Spectrum Properties
WANG Bao-lu,Eriqitai
(College of Energy and Power Engineering,Beihang University,Beijing 100191,China;)
Abstract:
In order to study the spectrum properties of the inverse methane/air diffusion flame,luminescent emissions from excited state radicals OH*(314nm) and CH*(430nm) have been measured in methane/air inverse diffusion flame emission spectrum by the fiber optical spectrometer. The effects of Reynolds number based on the cold-flow conditions of the air at the burner exit on the radiant intensity of OH* and CH*,and the distribution of radiant intensity along the flame axial and radial direction were analyzed. The results show that methane/air inverse diffusion flame has internal and external double-layer structure,the distribution of OH* and CH* radiant intensity along the flame axial and radial direction shows a trend of decrease after the first increase. With increasing rate of air flow,OH* and CH* extended to the flame downstream gradually,which made their distribution become larger. However,the peak intensity of the OH* and CH* appears at a distance of 5mm away from the burner exit,and the axial peak position does not change as the air flow increases.
Key words:  Inverse diffusion flame  Spectrometer character  Emission  Experimental investigation