プラズマ柱に接するアーク電極現象

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This report described the electrical and mechanical characteristics of the face-face electrode arc, which was supplied with Argon plasma stream, and macroscopic behavior of the electrode spot and boundary layer of that are by means of high speed photography. The face-face electrode was consist of copper anode and thoriated tungusten cathode or tungusten anode and thoriated tungusten cathode. The arc voltage-current characteristics was always dropping characteristics for tungusten anode. But using the copper anode, it changed from rising characteristics to dropping or flat characteristics with increasing of the arc current, and arc voltage rising ratio, in the region of rising characteristics, became large as the radial distance (R_a) of anode from nozzle axis was increased. Using tungusten anode, anode spot of which temperature was 3,700∿4,400K and diameter was 0.08∿0.13mm always existed. On the other hand, for copper anode, drop let of which thickness was 0.06∿0.17mm was observed until R_a was 1.1mm, but for over 1.1mm, anode spot of which temperature was 2,570∿2,650K and diameter was 0.06∿0.2mm was appeared. As the arc current increased, anode spot for tungusten anode was dispersed and then it was converged, but that for copper anode was dispersed. Boundary layer thickness on anode surface was increased in the region of rising characteristics of arc voltage, and that had different feature at the upstream and downstream. Behavior of cathode spot was regular reciprocating motion, but that of anode spot was random motion.
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プラズマ柱に接するアーク電極現象

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