Plasma "bullet" with hollow structure: formation and evolution.
Plasma "bullet" with hollow structure: formation and evolution.
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具有空心结构的等离子体“子弹”：形成与演化
DOI：
10.1038/s41598-018-25962-z
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发表时间：
2018-05-15
影响因子：
4.6
通讯作者：
Zhang G
中科院分区：
文献类型：
--
作者：
Chang Z;Zhao N;Li G;Zhang G
自2005年Teschke等人发现等离子体“子弹”和环形以来，等离子体“子弹”的中空结构作为一种重要现象一直是研究的热点。弄清大气压等离子体射流产生的机理对大气压等离子体射流的研究和应用具有重要意义。虽然在过去的几年里，对空心结构的产生和演化进行了大量的讨论，但实验研究者和数值模拟研究者之间存在着很大的分歧。前者认为Penning效应具有主要贡献，因为杂质的存在使得Penning过程能够在气流/空气界面处发生。数值模拟结果表明，潘宁效应对空心结构的形成并不起决定性作用。本文在前人工作的基础上，通过设置专门的实验，对这一有争议的问题进行了澄清。通过对这些现象和机理的比较分析，对潘宁效应对空心结构的贡献有了更好的理解。最后对等离子体射流中空结构的形成给出了有益的结论。
Since the plasma “bullet” and ring shape were discovered by Teschke and coworkers in 2005, the hollow structure of the plasma “bullet” has been a hot topic as an important phenomenon. Clearing the mechanism back on the phenomenon is very important to research and application of atmospheric pressure plasma jet (APPJ). Although a lot of discussions on the generation and evolution of the hollow structure have been conducted in past years, there is a substantial divergence between the experimental researcher and the numerical simulation researcher. The former considers that the Penning effect has a main contribution, because the presence of impurities enables the Penning process to occur at the gas flow/air interface. On the contrary, numerical simulation claims that the Penning effect is not so decisive to the formation of hollow structure. Based on our previous work, this paper aims to clear the debatable topic by setting the special experiments. After comparing and analyzing the phenomena and mechanism, a better comprehension is reached on the contribution of the Penning effect to the hollow structure. We also give a promising conclusion for forming the hollow structure of plasma jet in the end of paper.
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