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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Atmospheric dielectric barrier discharge containing helium-air mixtures: the effect of dry air impurities on the spatial discharge behavior
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Atmospheric dielectric barrier discharge containing helium-air mixtures: the effect of dry air impurities on the spatial discharge behavior

机译：含有氦气混合物的大气介电屏障放电：干燥空气杂质对空间放电行为的影响

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摘要

Air is a typical and arguably unavoidable impurity in atmospheric pressure dielectric barrier discharges (DBDs). The introduction of air may bring rich plasma chemical effects on DBDs and lead to a significant change of discharge characteristics. Here we implement a two-dimensional fluid model to study the spatial discharge behavior in a helium-dry-air DBD under the air impurity level (N-air) of 10-200 ppm. The simulation results reveal that under low impurity content (less than 30 ppm), the gas gap cannot be ignited due to the feeble Penning ionization during the breakdown. However, with an elevation in the impurity level, the progressively enhanced Penning ionization makes the DBD experience three different spatial modes, namely uniform, columnar, and complementary quasi-uniform modes. Of particular note is that the improvement of discharge uniformity observed after the second mode transition is not directly controlled by seed electron level-a previously reported qualitative indicator of the discharge uniformity concluded by helium DBDs with only nitrogen traces. And the main contributor to this phenomenon is the complementary spatial structure appearing in successive two discharges induced by the further reinforced Penning ionization with extra oxygen doped. The result suggests the necessity of considering oxygen in helium-air DBDs when the impurity effect of air is concerned.
机译：在大气压介质阻挡放电（DBD）中，空气是一种典型且可以说是不可避免的杂质。空气的引入可能会对DBD产生丰富的等离子体化学效应，并导致放电特性的显著变化。在这里，我们实现了一个二维流体模型来研究氦干空气DBD在10-200ppm空气杂质水平（N-air）下的空间放电行为。模拟结果表明，在低杂质含量（小于30ppm）下，由于击穿过程中的微弱潘宁电离，气隙不能被点燃。然而，随着杂质水平的升高，潘宁电离的逐渐增强使DBD经历三种不同的空间模式，即均匀、柱状和互补的准均匀模式。特别值得注意的是，在第二个模式转变后观察到的放电均匀性的改善并不是由种子电子水平直接控制的，种子电子水平是之前报道的一个放电均匀性的定性指标，其结论是氦DBD只有氮痕迹。这一现象的主要原因是在连续的两次放电中出现了互补的空间结构，这两次放电是由额外的氧掺杂进一步增强的潘宁电离引起的。结果表明，当考虑空气的杂质效应时，有必要考虑氦-空气DBD中的氧。

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