Visualization of arc and plasma flow patterns for advanced material processing
Visualization of arc and plasma flow patterns for advanced material processing
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DOI：
10.1007/s12650-014-0221-6
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发表时间：
2015-02
影响因子：
1.7
通讯作者：
O. Solonenko;H. Nishiyama;A. V. Smirnov;H. Takana;J. Jang
中科院分区：
文献类型：
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作者：
O. Solonenko;H. Nishiyama;A. V. Smirnov;H. Takana;J. Jang
摘要物理实验的结果说明了可视化研究操作条件（后向阶梯成形喷嘴、阳极出口直径、质量流量和工作气体组成）对先进涂层和粉末加工中低雷诺数等离子体流动影响的可能性和效率。特别地，基于自适应可视化透明的阴影方法用于不同操作条件下电弧和等离子体射流模式的成像。利用可视化技术，找到了后面向阶梯式成形喷嘴的最佳几何特性、工作气体的质量流量及其组成。这提供了：(1)对于转移电弧和双电弧而言，后面向阶梯式喷嘴内的电弧不存在微分流；(2)与瞬态射流和湍流射流相比，对于非转移电弧DC（直流）火炬和DC - rf（直流和射频）混合等离子体流系统，从准层流到平面基板和待处理粉末材料表面的热流密度更高。图形抽象
AbstractResults are presented for physical experiments that illustrate the possibilities and efficiency of visualization for studying the effect of operating conditions (backward-facing stepped forming nozzle, exit diameter of anode, mass flow, and composition of working gas) on plasma flows at low Reynolds numbers for advanced coating and powder processing. In particular, the shadow method, based on adaptive visualization transparency, is used for imaging electric arc and plasma jet flow patterns for different operating conditions. Because of visualization, the optimal geometrical characteristics of the backward-facing stepped forming nozzle, mass flow rate of the working gas, and its composition were found. These provide: (1) the absence of micro-shunting of the arc inside the backward-facing stepped nozzle for a transfer arc and twin arcs; and (2) compared to transient and turbulent jets, a higher density for the heat flux from a quasi-laminar flow to the surface of a flat substrate and the powder material to be treated, for nontransfer arc DC (direct current) torches and DC–RF (direct current and radio frequency) hybrid plasma flow system.Graphical Abstract