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首页> 外文期刊>High Temperature Material Processes >2-D AND 3-D FLUIDYNAMIC AND PLASMA CHARACTERIZATION OF DC TRANSFERRED ARC PLASMA TORCHES FOR METAL CUTTING
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2-D AND 3-D FLUIDYNAMIC AND PLASMA CHARACTERIZATION OF DC TRANSFERRED ARC PLASMA TORCHES FOR METAL CUTTING

机译：用于金属切削的直流传递电弧等离子炬的2维和3维流体动力学和等离子表征

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摘要

The aim of this work is to investigate by means of a 2-D and 3-D FLUENT based numerical model the behaviour of a transferred arc plasma torch recently developed within Cebora S.p.A. for the cutting of a metallic substrate material. Flow and heat transfer equations are solved with coupled electromagnetic ones, for LTE optically thin plasma, while turbulence phenomena are taken into account by means of a k-epsilon Realizable model. Simulations include a prediction of the thermal behaviour of the hafnium insert of the cathode and trajectories of hafnium oxide particles emitted from it and the efficiency of nozzle cooling systems in various operating conditions including gas mixtures (O_(2)/Air, H35/N_(2), Air/Air) fitted for various dimension and type of the cutting material. Results obtained from the simulations are compared with experimental measurements in order to perform a validation of the model in terms of pressure in different regions of the device, gas mass flow rate and nozzle temperature during the processing phase. For this purpose a modified plasma torch has been designed and used with realistic cutting conditions.
机译：这项工作的目的是通过基于2-D和3-D FLUENT的数值模型研究最近在Cebora S.p.A.中开发的用于切割金属基材的转移电弧等离子体炬的行为。对于LTE光学上较薄的等离子体，用耦合的电磁方程求解流动和传热方程，同时通过k-εRealizable模型考虑湍流现象。模拟包括预测阴极the插入物的热行为以及从阴极insert发出的氧化oxide颗粒的轨迹以及在包括气体混合物（O_（2）/空气，H35 / N_（ 2），空气/空气）适合各种尺寸和类型的切削材料。从仿真中获得的结果与实验测量值进行比较，以便在处理阶段根据设备不同区域的压力，气体质量流量和喷嘴温度对模型进行验证。为此，已经设计了一种改良的等离子炬，并在实际的切割条件下使用。

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