THE CONTROL OF GAS TEMPERATURE AND VELOCITY-FIELDS OF A RF INDUCTION THERMAL PLASMA BY INJECTING SECONDARY GAS

The present study describes the control characteristics of the gas tem perature and velocity fields of a RF induction argon thermal plasma by injecting cold helium gas axially at atmospheric pressure. The flow a nd the gas temperature fields in the RF induction mixed gas plasma are obtained by solving the axisymmetric turbulent 2D MHD equations and t he energy transport equation coupled with 2D Maxwell's equations. The mixing rate of a secondary injected gas is also calculated using the s pecies conservation equation. It is examined how the thermofluid and d iffusion characteristics of a RF induction plasma are influenced by th e input power and the positions of injection of secondary gas and swir ling. The calculated gas temperature shows good agreement with the pre viously obtained experimental data.