Abstract
In order to increase a jet power and an operating duration time of the forced constricted type plasma jet generator developed by authors, newly designed divergent nozzle anodes were developed. The diameter of nozzle anode changed in two steps, i.e. the inner diameter increased stepwise from the inlet towards the exit. The effects of the nozzle configuration on the characteristics of the arc and plasma jet were studied experimentally. The anode spot always attached at the taper section between the inlet region and the exit region. The arc voltage decreased by 3.2–9.1 V compared with that of a cylindrical nozzle anode, but a stable operating arc current expand up to 200 A. A stable and high power plasma jet was maintained over a long time at 200 A in arc current. The most suitable length of the inlet region was 2 mm, when the diameter of the inlet and exit regions was 6 and 8 mm, respectively.
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