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Thermophysics and Aeromechanics

2014 year, number 4

The heating and acceleration dynamics of Al2O3 particles in the axisymmetric heterogeneous flow emanating from a plasma torch with inter-electrode inserts

A.A. Mikhalchenko1, V.I. Kuzmin1, D.V. Sergachev1, E.V. Kartaev1, S.N. Ivanchik2, and I.S. Ivanchik2
1 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2 Novosibirsk State Academy of Water Transport, Novosibirsk, Russia
Keywords: low-temperature plasma, plasma torch with inter-electrode inserts, axisymmetric two-phase flow, temperature and velocity of Al2O3 particles


Measured data on the temperature and velocity of Al2O3 particles of size fraction 34±6 μm in the jet emanating from a DC plasma torch with inter-electrode inserts under conditions of axisymmetric heterogeneous flow are reported. The velocity and temperature of individual particles were measured using a laser-optical diagnostic complex, which was a combination of a bifocal laser anemometer and a pyrometer based on a compact spectrometer. For measuring the temperature of individual particles in the particle-laden plasma jet, three-color pyrometry was used. The obtained data on the characteristics of particles in the jet emanating from the plasma spray torch with inter-electrode inserts equipped with a unit for radial-annular injection of powder into the plasma jet show that the implemented conditions for processing powder materials allow reaching a high homogeneity of the aggregate state of particles in the jet flow (~ 100 % of melted particles).