Effects of inert dilution on the propagation and extinction of lean premixed syngas/air flames
Effects of inert dilution on the propagation and extinction of lean premixed syngas/air flames
复制标题
惰性稀释对贫预混合成气/空气火焰传播和熄灭的影响
DOI：
10.1016/j.fuel.2015.05.007
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发表时间：
2015-10
期刊：
影响因子：
7.4
通讯作者：
Junfu Lu
中科院分区：
文献类型：
--
作者：
Wenfeng Shen;Hai Zhang;Yuxin Wu;Junfu Lu
通过实验和数值模拟研究了惰性组分N2和CO2对H2/CO/空气合成气稀薄预混火焰传播和熄灭的稀释效应。采用逆流法测量了火焰的消光拉伸速率，层流火焰速度数据来自文献。数值模拟在1-D自由传播配置和对喷配置进行了详细的化学和分子输运的描述。数值计算结果与实验结果吻合较好。结果表明，CO2稀释比N2稀释对火焰传播和熄灭的影响更大。此外，数值模拟以相当定量的方式评估了三种效应中的优先重要性，即，热效应、扩散系数变化效应和化学效应，人工操纵CO2和N2的质量扩散系数和化学反应。结果表明，热效应对层流火焰传播速度和熄火应变速率的降低起主导作用。CO2稀释引起的化学效应对熄火极限的降低作用略强于对层流火焰速度的降低作用。CO2和N2稀释液的扩散率变化效应可以忽略不计。N2在H2/CO/空气火焰的传播和熄灭中仅起热惰性作用。
The dilution effects of inert components N2and CO2on the propagation and extinction of lean premixed H2/CO/air syngas flames were experimentally and numerically investigated. Extinction stretch rates were measured using the counterflow technique while laminar flame speed data were obtained from literatures. Numerical simulations were conducted at 1-D freely propagating configuration and opposed-jet configuration with detailed chemistry and molecular transport description. The numerical results well predicted the experimental measurements. Both results revealed that CO2dilution had more profound effect on flame propagation and extinction than N2dilution. In addition, numerical simulation assessed the preferential importance in a rather quantitative manner among the three effects, i.e., the thermal effect, the diffusivity change effect and the chemical effect with artificial manipulation of mass diffusivities and chemical reactions of CO2and N2. The results showed that the thermal effect dominated the reduction of laminar flame speed and extinction strain rate. The chemical effect caused by CO2dilution was slightly stronger to the reduction of extinction limit than to that of laminar flame speed. The diffusivity change effect is negligible for both CO2and N2dilutions. N2only acts as a thermal inert in the propagation and extinction of the H2/CO/air flames.
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影响因子：
3.2
作者：
MOFFAT, RJ
通讯作者：
MOFFAT, RJ
DOI：
10.1016/j.proci.2010.06.116
发表时间：
2011
期刊：
--
影响因子：
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作者：
O. Park;P. Veloo;Ning Liu;F. Egolfopoulos
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作者：
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影响因子：
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作者：
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通讯作者：
Mounaim-Rousselle, C.
影响因子：
10.4
作者：
Chenglong Tang;Jianjun J. Zheng;Zuo-hua Huang;Jinhua Wang
通讯作者：
Chenglong Tang;Jianjun J. Zheng;Zuo-hua Huang;Jinhua Wang