Characteristics of Gliding Arc and Its Application in Combustion Enhancement
Characteristics of Gliding Arc and Its Application in Combustion Enhancement
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DOI：
10.2514/1.24795
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发表时间：
2008-11
影响因子：
1.9
通讯作者：
A. Fridman;A. Gutsol;S. Gangoli;Y. Ju;T. Ombrello
中科院分区：
文献类型：
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作者：
A. Fridman;A. Gutsol;S. Gangoli;Y. Ju;T. Ombrello
为了研究非热等离子体对点火和熄灭现象的增强作用，研制了一种新型的磁稳定滑动电弧反应器与逆流燃烧器耦合。结果表明，新的耦合等离子体-火焰系统为理解等离子体-火焰相互作用的基本机制提供了一个良好的平台。结果表明，在等离子体放电的气流中，在低功率输入下，用氮稀释的空气和甲烷的消光应变率可能增加220%。通过平面瑞利散射测温法测量温度分布，通过平面激光诱导荧光（用吸收校准）测量OH数密度分布，以量化各种效应。在较高的空气温度和自由基加入下进行了详细的数值模拟，并与实验结果进行了比较。消光实验的结果最初表明，对于我们特定的实验设置，增强效应主要是热的。然而，在专门针对氢气的点火实验中，对氢-空气混合物进行的温度测量表明，活性物质的贡献证明了增强效应的程度。与数值模拟的进一步比较也提供了对自由基以外的物种参与增强效应的深入了解。
A novel magnetically stabilized gliding arc reactor coupled with a counterflow burner was developed to study nonthermal plasma enhancement of ignition and extinction phenomena. The results showed that the new coupled plasma-flame system provides a well-defined platform for understanding of the basic mechanism of the plasma-flame interaction. It was shown that with a plasma discharge of the airstream, up to a 220 % increase in the extinction strain rate was possible at low power inputs for air and methane diluted with nitrogen. Measurements of temperature profiles via planar Rayleigh scattering thermometry and OH number density profiles via planar laser-induced fluorescence (calibrated with absorption) were taken to quantify various effects. Detailed numerical simulations at elevated air temperatures and radical addition were performed for comparison with experimentally obtained results. Results of the extinction experiments initially suggested that the enhancement effect was predominantly thermal for our particular setup of experiments. However, in ignition experiments specifically for hydrogen, temperature measurements conducted for hydrogen-air mixtures suggested the contribution of active species to justify the extent of the enhancement effect. Further comparison with numerical simulations also provides an insight into the participation of species other than radicals in the enhancement effect.