This paper presents a detailed numerical analysis that shows why Laval nozzles are used for vacuum plasma spraying and how to optimize their design to achieve a uniform plasma jet free of expansion waves under different spraying conditions. A Laval nozzle prototype is tested against a commercially available conical nozzle and is found to deliver a longer core jet with less turbulent scattering. Paper includes a German-language abstract.

conical diverging nozzle, Laval nozzle, nozzle design, numerical modeling, plasma jet, vacuum plasma spraying
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Copyright © 2002 Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH. All rights reserved.
2002
Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH
Topics
Thermal spray equipment Plasma spray coating Computational fluid dynamics Turbulent flow Thermodynamic analysis
Issue Section:
Poster Session: Coating Properties—Test, Measurement, and Characterization
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