多相交流アーク加熱器

概要

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This report discribed the electrical characteristics, dynamic behavior of the arc in the nozzle cross section and the plasma jet of the AC arc heater which used six phase AC power source. This arc heater had six radial electrodes in the constricter section of a nozzle and constricted and stabilized the arc which ignited between electrodes with argon gas flow. Experiments were made at the arc maintained current 30∿80A, the total gas flow rate (Q) 20∿30l/min, the ratio (D) of the center gas flow rate to total gas flow rate 0∿0.5 and electrode gap 7mm. Always eight arcs (two opposite arcs, four delta arcs and two adjacent arcs) existed in the nozzle cross section and each arc ignited according to the phase rotation of the six phase AC power source. The duration time of the opposite arc, delta arc and adjacent arc were respectively 1/180 sec, 1/180 sec and 1/360 sec at each half cycle (1/120 sec). The arc in the nozzle cross section was most effectively constricted toward the nozzle axis at D=0.3∿0.4 when the arc maintained current was large. The arc voltage-arc maintained current characteristics were drooping characteristics. The thermal efficiency of this AC arc heater was 60∿70% and the highest at D=0.3∿0.4. The mean temperature of the plasma jet was 3,600∿9,600K and the longest length of the plasma jet was 19.3mm.
山口大学の論文