直流电弧等离子体射流流动动力学的计算研究
Computational study of flow dynamics from a dc arc plasma jet
摘要：
由直流（DC）非转移弧等离子体炬产生的等离子体射流是从喷涂到热解的技术的核心，由于流体流动、热和电磁现象的耦合相互作用而呈现出复杂的动力学。电弧放电等离子体射流的流动动力学研究使用时间相关的三维模拟，包括火炬内的电弧的动态，通过放电环境的射流的演变，以及随后的冲击射流在一个平面基板。等离子体由化学平衡和热力学非平衡（双温度）模型描述。物理模型的数值公式是基于一个整体和完全耦合的处理的流体和电磁方程，使用变分多尺度有限元法。模拟结果揭示了不同方面的流动动力学，包括射流强迫由于运动的电弧，流行的偏差之间的重物种和电子温度的等离子体条纹，剪切流不稳定性的发展射流周围，发生的局部区域与高电场远离电弧，和相干流结构的形成和演变。
英文摘要：
Plasma jets produced by direct-current (DC) non-transferred arc plasma torches, at the core of technologies ranging from spray coating to pyrolysis, present intricate dynamics due to the coupled interaction of fluid flow, thermal, and electromagnetic phenomena. The flow dynamics from an arc discharge plasma jet are investigated using time-dependent three-dimensional simulations encompassing the dynamics of the arc inside the torch, the evolution of the jet through the discharge environment, and the subsequent impingement of the jet over a flat substrate. The plasma is described by a chemical equilibrium and thermodynamic nonequilibrium (two-temperature) model. The numerical formulation of the physical model is based on a monolithic and fully-coupled treatment of the fluid and electromagnetic equations using a Variational Multiscale Finite Element Method. Simulation results uncover distinct aspects of the flow dynamics, including the jet forcing due to the movement of the electric arc, the prevalence of deviations between heavy-species and electron temperatures in the plasma fringes, the development of shear flow instabilities around the jet, the occurrence of localized regions with high electric fields far from the arc, and the formation and evolution of coherent flow structures.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
