S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Energy Systems Engineering (에너지시스템공학부) Nuclear Engineering (원자핵공학전공) Journal Papers (저널논문_원자핵공학과)
Effects of Anode Nozzle Geometry on Ambient Air Entrainment into Thermal Plasma Jets Generated by Non-Transferred Plasma Torch
Cited 23 time in Web of Science Cited 31 time in Scopus
- Issue Date
- IEEE Trans. Plasma Sci. vol. 32(2), pp. 473-478
- air entrainment ; enthalpy probe ; nozzle geometry effects ; plasma spraying ; plasma torch ; quadruple mass spectrometry
- The geometrical effects of anode nozzle in a non-transferred plasma torch on air entrainment are examined by measurements of plasma composition using a quadruple mass spectrometry. In addition, the radial and axial distributions of plasma enthalpy, temperature and velocity are measured by using an enthalpy probe method. Two types of anode nozzle geometry, i.e., cylindrical and stepped nozzles, are employed for the torch in this experiment. As a result of gas composition measurements, the new stepped nozzle turns out to produce a thermal plasma jet having lower air contents in it compared with the conventional cylindrical nozzle. The plasma jet produced by the stepped nozzle exhibits higher enthalpy and temperature, especially around the core of the plasma flame due to less intrusion of ambient air. Furthermore, the axial velocity distribution with a slowly changing variation is observed in the stepped nozzle case because of the plasma flow less disturbed by air entrainment. From these experimental results of thermal plasma characteristics and nozzle geometry effects on air entrainment, high quality of coating products are expected in plasma spraying by using the stepped nozzle due to higher plasma enthalpy and temperature, and lower velocity drop along the plasma jet.
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