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Visualization of arc and plasma flow patterns for advanced material processing

机译:可视化电弧和等离子流模式,用于高级材料处理

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摘要

Results 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.
机译:给出的物理实验结果说明了可视化的可能性和效率,以研究低雷诺数下的工作条件(向后的阶梯状成型喷嘴,阳极的出口直径,质量流量和工作气体的组成)对等离子流的影响用于高级涂料和粉末加工。特别是,基于自适应可视化透明度的阴影方法用于对不同操作条件下的电弧和等离子流模式进行成像。由于可视化,找到了向后阶梯式成型喷嘴的最佳几何特性,工作气体的质量流量及其组成。这些提供了:(1)在向后的阶梯式喷嘴内没有用于转移电弧和双电弧的电弧的微分流; (2)与瞬态和湍流射流相比,对于非传递电弧DC(DC)焊炬和DC,从准层流到平坦基材表面和待处理粉末材料的热通量密度更高。 -RF(直流和射频)混合等离子体流系统。

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