プラズマ流に対するパルス加熱機構の解析

概要

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The hybrid plasma apparatus, which heats the plasma jet by the pulsed magnetic field, can't only increase the power of the plasma jet but also control the configuration and temperature distribution of it. The object of this study is theoretical and experimental investigation of the pulsed heating mechanism to the plasma jet. Based on the idealizd hybrid plasma model, theoretical temperature and power input distribution of the hybrid plasma were obtained by numerically solving a set of equation which included Maxwell's field equation, Ohm's law and Elenbaas-Heller's equation. In experiment, using the 3 turns induction coil, the damped pulsed magnetic field was applied to the plasma jet which was generated at arc current 100A, argon gas flow rate 41/min.. The frequency of the damped pulsed magnetic field was 65.7kHz, 375kHz and the strength of it was 1,986∿3,362G. The light intensity from hybrid plasma was measured by a photomultiplier. Theoretical temperature distribution of the hybrid plasma had off-axis peak characteristics and power input of it attained peak value in outer region of the plasma by skin effect. In case of the strength and frequency of the damped pulsed magnetic field being 3,362G and 65.7kHz respectively at 2mm from nozzle exit, the increment of the light intensity attained maximum value at 0.25mm in radius and it deserved about 11% of light intensity of the base plasma at the same position.
山口大学の論文