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Progress in Plasma Processing of Materials, 2001

ISBN:
1-56700-165-3 (Print)

VELOCITY OF PLASMA AND PARTICLES IN OXYGEN-HYDROGEN THERMAL PLASMA JET

Milan Hrabovsky
Institute of Plasma Physics, Academy of Sciences Za Slovankou 3, 182 00, Prague

M. Konrad
TECOSIM Technische Simulation Gmbh Robert-Bosch-Str. 10, D-50769 Collogne, Germany; and Institute of Plasma Physics, Za Slovankou 3, 182 00, Praha 8, Czech Republic

Vladimir Kopecky
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic

Abstract

Velocity of particles injected into thermal plasma jet were measured using two fast shutter CCD cameras with multiple exposure. Two perpendicular views of the jet were recorded simultaneously and thus exact position and trajectories of individual particles were determined. Velocity of plasma and values of material· coefficients were evaluated from the measured changes of particle velocity along their trajectories using equation for momentum transfer between plasma and particles. Temperature of plasma at a given point was then determined using calculated LTE values of material coefficients. Radial profiles of plasma temperature and velocity were determined by this method for various axial positions along the jet and various arc currents.