甲烷反扩散火焰光谱特性实验研究

推进技术 ›› 2016, Vol. 37 ›› Issue (1): 105-111.

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,北京航空航天大学能源与动力工程学院，北京 100191

发布日期:2021-08-15
作者简介:王宝璐，男，博士生，研究领域为发光火焰的辐射特性与辐射换热。

Experiment Study of Inverse Methane/Air Diffusion Flame Emission Spectrum Properties

College of Energy and Power Engineering，Beihang University，Beijing 100191，China; and College of Energy and Power Engineering，Beihang University，Beijing 100191，China;

Published:2021-08-15

摘要/Abstract

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

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

王宝璐,额日其太. 甲烷反扩散火焰光谱特性实验研究[J]. 推进技术, 2016, 37(1): 105-111.

WANG Bao-lu,Eriqitai. Experiment Study of Inverse Methane/Air Diffusion Flame Emission Spectrum Properties[J]. Journal of Propulsion Technology, 2016, 37(1): 105-111.

参考文献

[1] Wu K T, Essenhigh R H. Mapping and Structure of Inverse Diffusion Flames of Methane[C]. Pittsburgh: 20th Symposium(International) on Combustion, 1984.
[2] Mark A Mikofski, Timothy C Williams, Christopher R Shaddix, et al. Flame Height Measurement of Laminar Inverse Diffusion Flames[J]. Combustion and Flame, 2006, 146(1-2): 63-72.
[3] Mark A Mikofskia, Timothy C Williamsb, Christopher R Shaddixb, et al. Structure of Laminar Sooting Inverse Diffusion Flames[J]. Combustion and Flame, 2007, 149(4): 463-478.
[4] Wentzell J. Characteristics and Structure of Inverse Flames of Natural Gas[D]. Ontario: Queen's University, 1998.
[5] Lee E J, K C Oh, H D Shin. Soot Formation in Inverse Diffusion Flames of Diluted Ethane[J]. Fuel, 2005, 84(5): 543-550.
[6] 敖文, 汪洋, 李和平, 等. 不同气氛下硼燃烧发射光谱分析及火焰形态研究 [J]. 推进技术, 2014, 35(5):648-653. (AO Wen, WANG Yang, LI He-ping, et al. Study on Emission Spectroscopy and Flame of Boron Combustion in Different Atmosphere[J]. Journal of Propulsion Technology, 2014, 35(5): 648-653.)
[7] Roper F G. The Prediction of Laminar Jet Diffusion Flame Sizes: Part Ⅰ Theoretical Model[J]. Combustion and Flame, 1977, 29(24): 219-226.
[8] Zhen H S, Leung C W, Cheung C S. Thermal and Emission Characteristics of a Turbulent Swirling Inverse Diffusion Flame[J]. International Journal of Heat and Mass Transfer, 2010, 53(5-6): 902-909.
[9] Elbaz A M, Roberts W L. Flame Structure of Methane Inverse Diffusion Flame[J].Experimental Thermal and Fluid Science, 2014, 56(5): 23-32.
[10] Donga L L, Cheungb C S, Leungb C W. Heat Transfer Characteristics of an Impinging Inverse Diffusion Flame Jet–Part I Free Flame Structure[J]. International Journal of Heat and Mass Transfer, 2007, 50(25-26):5108-5123.
[11] Ariasa L, Torresa S, Sbarbaroa D, P. et al. On the Spectral Bands Measurements for Combustion Monitoring[J]. Combustion and Flame, 2011, 158(3): 423-433.
[12] Roper F G, Smith C, Cunningham A C. The Prediction of Laminar Jet Diffusion Flame Sizes(Ⅱ):Experimental Verification[J]. Combustion and Flame, 1977, 29(25): 227-234.
[13] Vagelopoulos C M, Frank J H. An Experimental and Numerical Study on the Adequacy of CH as a Flame Marker in Premixed Methane Flames[J]. Proceedings of the Combustion Institute, 2005, 30(1): 241-249.
[14] 丁玉柱. 甲烷DBD燃烧强化中CH光谱测量及其燃烧仿真研究[D]. 武汉:华中科技大学, 2011.
[15] Docquier Nicolas, Lacas Francois, Candel Sebastien. Closed-Loop Equivalence Ratio Control of Premixed Combustors Using Spectrally Resolved Chemiluminescence Measurement[J]. Proceedings of the Combustion Institute, 2002, 29(1) : 139-145.(编辑:史亚红)　　　　　　　　　　　　　*　收稿日期:2014-09-25；修订日期:2014-10-28。作者简介:王宝璐,男,博士生,研究领域为发光火焰的辐射特性与辐射换热。E-mail: polor_wang1@163.com