Atmospheric pressure gliding arc (GA) discharges are gaining increasing interest for CO₂ conversion and other gas conversion applications, due to their simplicity and high energy efficiency. However, they are characterized by some drawbacks, such as non-uniform gas treatment, limiting the conversion, as well as the development of a hot cathode spot, resulting in severe electrode degradation. In this work, we built a dual-vortex plasmatron, which is a GA plasma reactor with innovative electrode configuration, to solve the above problems. The design aims to improve the CO₂ conversion capability of the GA reactor by elongating the arc in two directions, to increase the residence time of the gas inside the arc, and to actively cool the cathode spot by rotation of the arc and gas convection. The measured CO₂ conversion and corresponding energy efficiency indeed look very promising. In addition, we developed a fluid dynamics non-thermal plasma model with argon chemistry, to study the arc behavior in the reactor and to explain the experimental results.

Keywords: Plasma; Modeling; Reactor; CO₂ conversion, CFD, Vortex, Argon, Atmospheric pressure

由于CO ₂转化和其他气体转化应用的简单性和高能效，大气压滑弧（GA）放电越来越引起人们的关注。然而，它们的特征在于一些缺陷，例如不均匀的气体处理，限制转化以及产生热的阴极斑点，从而导致严重的电极退化。在这项工作中，我们构建了双涡旋等离子加速器，这是一种具有创新电极配置的GA等离子反应器，可以解决上述问题。该设计旨在改善CO ₂通过在两个方向上拉长电弧，增加气体在电弧内的停留时间，并通过电弧旋转和气体对流主动冷却阴极点，从而提高了GA反应器的转化能力。所测量的CO ₂转化率和相应的能源效率确实看起来很有希望。此外，我们开发了一种具有氩化学性质的流体动力学非热等离子体模型，以研究反应器中的电弧行为并解释实验结果。

关键字：等离子；造型; 反应堆; CO ₂转化，CFD，涡旋，氩气，大气压