IMECH-IR  > 高温气体动力学国家重点实验室
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
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
Indexed ByCSCD
Funding Organization国家自然科学基金资助项目(51006115,91130028,50976122)
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Document Type期刊论文
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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