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甲烷高压富氧燃烧层流扩散火焰的数值研究
Alternative TitleNumerical Study on Oxygen-Enhanced Axisymmetric Laminar Methane Diffusion Flames at High Pressures
覃建果; 魏小林; 郭啸峰; 李腾; 高佳佳
Source Publication燃烧科学与技术
2013-10-15
Volume19Issue:5Pages:425-433
ISSN1006-8740
Abstract对0.1~4.0,MPa 范围内CH_4富氧燃烧层流同轴射流扩散火焰进行了数值研究,研究对象包含3种工况:工况1为CH_4/空气,工况2为CH_4/70%N2和30%O_2,工况3为CH_4/70%CO_2和30%O_2.计算模型采用了基于GRI 3.0的骨干反应机理,该机理包含26种组分和163个反应,同时模型还考虑了CH_4、H_2O、CO_2、CO 的辐射换热损失.结果表明,富氧燃烧使火焰温度升高、长度变短.工况2中NO排放指数与工况1相比增加了70%,且随压力的提高而增大,绝大部分NO 是通过热力型NO 途径形成.基元反应H+CO_2≒OH+CO 使得工况3近燃烧器喷口处的CO浓度大大增加.提高压力,火焰温度先升高后降低,火焰半径逐渐变小,火焰长度几乎不变。
Other AbstractNumerical study of three axisymmetric laminar co-flow diffusion flames at pressures between 0.1, 4.0 MPa was conducted. One flame is a methane/air flame(Flame 1),and the other two are methane/nitrogen-diluted oxygen flame(Flame 2)and methane/carbon dioxide -diluted oxygen flame(Flame 3),the mass fraction of oxygen in the oxidizer of Flame 2,and Flame 3,are both 30%. Numerical model includes a skeletal mechanism derived from GRIMech 3.0,with 163 reaction steps and 26 species. An optically thin radiation sub-model was employed in the simulations to consider the thermal radiation absorption by species such as CH_4,CO_2,CO and H_2O. As compared to Flame 1,the two oxygen-enhanced combustion flames are shorter and hotter. NO emission index in Flame 2 increases by 70% and increase monotonically with pressure. The majority of NO in Flame 2 is produced via the thermal route. The reaction step:H+CO_2≒OH+CO accounts for the high mole fraction of CO in Flame 3 near the fuel tube exit. As the pressure increases,flame temperature increases firstly and then decreases,flame radius decreases monotonically, while flame height remains almost constant.
Keyword甲烷 富氧燃烧 高压燃烧 No
Subject Area化工流体力学
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Indexed ByCSCD
Language中文
Funding Organization国家自然科学基金资助项目(51006115,91130028,50976122)
CSCD IDCSCD:4966273
DepartmentLHD高效洁净燃烧(CPCR)
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48062
Collection高温气体动力学国家重点实验室
Corresponding Author魏小林
Recommended Citation
GB/T 7714
覃建果,魏小林,郭啸峰,等. 甲烷高压富氧燃烧层流扩散火焰的数值研究[J]. 燃烧科学与技术,2013,19(5):425-433
APA 覃建果,魏小林,郭啸峰,李腾,&高佳佳.(2013).甲烷高压富氧燃烧层流扩散火焰的数值研究.燃烧科学与技术,19(5),425-433.
MLA 覃建果,et al."甲烷高压富氧燃烧层流扩散火焰的数值研究".燃烧科学与技术 19.5(2013):425-433.
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