The production and evolution of atomic oxygen in the afterglow of streamer discharge in atmospheric pressure fuel/air mixtures
The production and evolution of atomic oxygen in the afterglow of streamer discharge in atmospheric pressure fuel/air mixtures
复制标题
大气压燃料/空气混合物流光放电余辉中原子氧的产生和演化
DOI：
10.1088/0022-3727/46/30/305202
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
W. Lempert
中科院分区：
文献类型：
--
作者：
S. J. Pendleton;S. Bowman;C. Carter;M. Gundersen;W. Lempert
在这项工作中，双光子吸收激光诱导荧光被用来测量各种燃料/空气混合物中的流光放电余辉中的氧原子（O）浓度，以解释瞬态等离子体点火中的O反应途径。它表明，O原子产生的高浓度（105 × 1017 cm−3）直接低于高压阳极在一个点到平面的几何形状。在空气中的相应寿命大约为数百微秒。即使没有持续的燃烧，燃料化学也通过链分支反应提供了消耗途径，相应的O原子寿命比空气中短得多，并取决于燃料浓度。在最丰富的条件下，对应于燃料-空气当量比为2.4，O寿命的顺序为几微秒或less. These的实验结果进行比较，以更好地了解原子氧的化学过程中的作用，导致点火建模估计。
In this work two-photon absorption laser-induced fluorescence was used to measure oxygen atom (O) concentrations in streamer discharge afterglow in a variety of fuel/air mixtures in order to account for the O reaction pathways in transient plasma ignition. It is demonstrated that O atoms are generated in high concentration (∼5 × 1017 cm−3) directly below the high-voltage anode in a point-to-plane geometry. The corresponding lifetimes in air were on the order of hundreds of microseconds. Fuel chemistry provides consumption pathways via chain branching reactions even without sustained combustion, and the corresponding O-atom lifetimes were much shorter than in air and dependent on the fuel concentration. At the richest conditions, corresponding to a fuel–air equivalence ratio of 2.4, O lifetimes were on the order a few microseconds or less. These experimental results are compared to modelling estimates in order to better understand the role of atomic oxygen in the chemical processes leading to ignition.