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ISSN Online: 2379-1748

8th Thermal and Fluids Engineering Conference (TFEC)
March, 26-29, 2023, College Park, MD, USA

SIMULATING THE PLUME QUENCH FOR PLASMA SPRAY APPLICATIONS

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DOI: 10.1615/TFEC2023.mpp.046245

要約

Plasma sprays can be used to melt particles, which may be deposited on an engineered surface to apply unique properties to the part. Because of the extreme temperatures (>>3000°C) it is desirable to conduct the process in a way to avoid melting the parts to which the coatings are being applied. A jet of ambient gas is sometimes used to deflect the hot gases, while allowing the melted particles to impact and adhere to the substrate. This is known as a plume quench. While plume quenching is done in practice, to our knowledge there have not been any studies on how to apply a plume quench, and how it may affect the flows. We have recently adapted our fire simulation tool to simulate argon plasma sprays with a variety of metal particles. Two nozzle conditions are considered, with very different gas flow and power conditions. Two particle types are considered, Tantalum and Nickel. For the model, the k-epsilon turbulence model is compared to a more dynamic TFNS turbulence model. Limited data comparisons suggest the higher-fidelity TFNS model is significantly more accurate than the k-epsilon model. Additionally, the plume quench is found to have a noticeable effect for the low inlet flow case, but minimal effect on the high flow case. This suggests the effectiveness of a quench relates to the relative momentum of the intersecting gas jets.