Application of DC plasma torch with a quasi-laminar jet outflow
- Russian Academy of Sciences, Novosibirsk (Russian Federation)
The experimental results characterizing the heat exchange between a plasma jet and a plane obstacle under laminar and transient regimes of flow are presented. Such parameters as the shape of the exit nozzle-anode (cylinder, diffuser and step), the distance between the nozzle exit and a flat barrier, and DC plasma torch regime parameters (arc current, and flow rate of a plasma-forming gas) were varied in the experiments. The plasma jets were generated by a DC plasma torch with sectional interelectrode inserts (IEI). The supply of plasma-forming gas (nitrogen) with the flow rate of 0.4--1.4 g/s was tangential. Argon with the flow rate of 0.2 g/s was fed into the gap between the last section of the IEI and the anode. As shown, the use of the stepped exit nozzle allows a decrease of mixing of the plasma jet with surrounding atmosphere and an increase in the thermal efficiency of the heat exchange plasma jet-surface. The results were used for optimization of the technology of a coatings plasma treatment.
- OSTI ID:
- 377743
- Report Number(s):
- CONF-9509182--; ISBN 0-87170-541-9
- Country of Publication:
- United States
- Language:
- English
Similar Records
Arc plasma jets of a nontransferred plasma torch
Effect of current connection to the anode nozzle on plasma torch efficiency