In order to improve our understanding of the PAMCHR process applied to the processing of Ti alloys, a 3D numerical simulation of the thermal and hydrodynamic behavior of the metal flowing in the refining hearth has been set up, based on Ansys-Fluent CFD software. The solid and liquid phases are governed by a set of transport equations expressing the conservation of mass, momentum, heat, and solutes. The turbulence of the liquid flow is modeled through the standard k – ε model. Heat input and tangential shear stress caused by the plasma jet originating from the torches, as well as the themocapillary effect, are accounted for as boundary conditions. Their effects on the turbulent liquid metal flow have been modeled together with the displacement of the torches. Simulation results are presented for a pilot furnace and representative operating conditions. Turbulent fluid flow in the Ti64 molten pool is analyzed in detail and the role of each momentum source is examined. Comparison between the measured and calculated pool profiles is also reported and reveals a satisfactory agreement.

中文翻译：

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等离子电弧熔化冷炉床精炼工艺 (PAMCHR) 的数值模拟

为了加深我们对应用于钛合金加工的 PAMCHR 工艺的理解，基于 Ansys-Fluent CFD 软件建立了金属在精炼炉膛中流动的热和流体动力学行为的 3D 数值模拟。固相和液相由一组表示质量、动量、热量和溶质守恒的传输方程控制。液体流动的湍流通过标准 k – ε 模型进行建模。由来自火炬的等离子体射流引起的热输入和切向剪切应力以及热毛细管效应被视为边界条件。它们对湍流液态金属流动的影响已与焊炬的位移一起建模。给出了中试炉和代表性操作条件的模拟结果。详细分析了 Ti64 熔池中的湍流流动，并检查了每个动量源的作用。还报告了测量的和计算的池配置文件之间的比较，并显示出令人满意的一致性。