Consequences of unburned hydrocarbons on microstreamer dynamics and chemistry during plasma remediation of NOx using dielectric barrier discharges
Consequences of unburned hydrocarbons on microstreamer dynamics and chemistry during plasma remediation of NOx using dielectric barrier discharges
复制标题
使用介质阻挡放电等离子体修复氮氧化物过程中未燃烧的碳氢化合物对微流动力学和化学的影响
DOI：
10.1088/0022-3727/36/9/305
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
M. Kushner
中科院分区：
文献类型：
--
作者：
R. Dorai;M. Kushner
大气压等离子体，特别是介质阻挡放电（DBD），正在研究它们在汽车尾气中的氮氧化物（NOx）修复中的应用。在其正常操作模式下，DBD由大密度的短寿命寄生微放电组成。局部能量沉积导致空间上不均匀的气体温度和物种密度，从而引发平流和扩散输送。柴油机废气是NOx的主要来源之一，通常含有未燃烧的碳氢化合物（UHC），其在等离子体修复期间显著影响NOx化学。在本文中，我们讨论的结果，从计算调查的后果UHC化学径向运输动力学和补救的氮氧化物。在UHCs的存在下，自由基，如O和OH主要消耗在微流束区域和它们的运输到更大的半径减少。因此，NO到NO2的转化主要限于微流束的核心。
Atmospheric pressure plasmas, and dielectric barrier discharges (DBDs) in particular, are being investigated for their use in the remediation of nitrogen oxides (NOx) from automotive exhausts. In their normal mode of operation, DBDs consist of a large density of short-lived filamentary microdischarges. Localized energy deposition results in spatially nonuniform gas temperatures and species densities which initiate advective and diffusive transport. Diesel exhausts, one of the major sources of NOx, typically contain unburned hydrocarbons (UHCs) which significantly influence the NOx chemistry during plasma remediation. In this paper, we discuss results from a computational investigation of the consequences of UHC chemistry on radial transport dynamics and remediation of NOx. In the presence of UHCs, radicals such as O and OH are dominantly consumed in the microstreamer region and their transport to larger radii is reduced. As a result, the conversion of NO to NO2 is mainly restricted to the core of the microstreamer.