Characteristics of the Three Phase AC Plasma Jet

This report described the general characteristics of the three phase AC plasma jet which was generated by the three electrode type plasma jet generator which had three radial electrodes in the constrictor section of a nozzle. The measurements of the restriking voltage and the duration time of the arc of each electrode gap at each half cycle indicated that the polarity of arc and the arc operating parameters (arc current, gas flow rate) had a little influence on the restriking characteristics. And also, it was indicated that the arc was always ignited in two electrode gaps according to the phase rotation of the three phase AC power source. The arc voltage-current characteristics was a drooping characteristics. The thermal efficiency was range from 68% to 75%. The plasma jet was stable, for all the arc was restriked at 360Hz, and its length, which was elongated in comparison with that of the single phase AC plasma jet, was range from 17.0mm to 19.9mm at gas flow rate : 20 1/min.