交流プラズマジェットの動特性の解析

概要

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This report described the dynamic characteristics of the AC plasma jet, which was generated by the cross electrode type plasma jet generator, that had the resistance ballast (R-ballast) or reactance ballast (RL-ballast). The measurements of the restriking voltage and the dead time of arc current after extinction at each half cycle indicated that the polarity of arc, the ballast and the arc operating parameters (arc current, gas flow rate, electrode gap) had a marked influenced on the restriking characteristics. Using the R-ballast, the restriking characteristics were very influenced by the polarity of arc and the arc operating parameters, but using the RL-ballast, they were not influenced by that, and so the dead time of arc current was always under 25 μsec. The thermal efficiency was 56∿79%, and, when the RL-ballast was used, the overall thermal efficiency of the generator was 7∿ 22%. The dynamic behavior of AC plasma jet was shown by high speed photography. Using the RL-ballast, the duration time of a half cycle of an efficient jet was found to be 7.6 msec at arc current; 100A and the elongation speed of jet was 10.7 m/sec. The temperature of AC plasma jet was obtain by spectroscopic method. When the RL-ballast was used and arc current was 100A, the maximum temperature was found to be 15,000K at 4.3 msec after reverse ignition.
山口大学の論文