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Ruby-laser scattering measurements were performed for impulse-breakdown plasmas in an atmospheric air under different discharge conditions. Local electron densities, temperatures in the arc channels a...nd neutral particle densities in shock-waves were obtained with spatial resolution of 0.3mm and temporal resolution of 20 nsec. From the measurements, thermodynamic, fluid-mechanical and electrodynamic properties of the arc plasma and the resultant shock-wave were revealed. In particular, pressures in the arc channels were found uniform at each time for each discharge condition, and maximum pressure as high as 12 atm was observed just after the beginning of the discharge, which was enough to cause the shock-wave expansion at later times. Air tempreature just outside of the arc channel was estimated to be more than 1000^°K from the pressure balance at the arc channel surface and the measured neutral particle densities. In addition, it was found that most of the electrical energy released in the arc channel at the beginning of the discharge was divided among energies of ionization, dissociation, heat and arc channel expansion, and that the biggest of these was the ionization energy.続きを見る
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Mendeley出力
