アキシャルフィード型サスペンションプラズマスプレーの数値シミュレーション

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  • Numerical Simulation of Suspension Plasma Spraying with Axial Injection
  • アキシャルフィードガタ サスペンションプラズマスプレー ノ スウチ シミュレーション

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Two-dimensional simulation is performed for an annular-shaped plasma torch using argon gas under different operating currents and torch-substrate distances. The mathematical model is based on the conservation equations of mass, momentum, and total energy for gasdynamics and the steady-state Maxwell's equations for electrodynamics. Suspension carrying zirconium particles are axially injected into plasma flow and their trajectories and heating histories are analyzed with the Lagrangian method. A simplified model is used to simulate the evaporation of suspension droplets and the emergence of solid particles. The numerical results show that current streamlines are sharply bent at an intersection area between anode and cathode plasma jets. In-flight particles are strongly heated in the intersection area. An increase in operating currents results in shortening the length of currents and moving the curvature area further upstream. The numerical results also indicate that the particle impacting positions on a substrate get closer to its center as the operating current gets larger and the torchsubstrate distance becomes narrower. Furthermore, the numerical results suggest that setting an operating current to higher values, which leads to an increase in particle impacting velocity, is suitable for impacting particles with molten state on thesubstrate.

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