Numerical modelling of low-temperature non-equilibrium plasma of pulsing corona and breakdown

摘要

The method of determining an existence region of the non-equilibrium plasma of the pulsating negative coronaudand breakdown is developed. The low-temperature non-equilibrium pulsing plasma of the point-to-plane negativeudcorona and a transition form to the breakdown in nitrogen-oxygen mixture are numerically simulated.udIt is shown that plasma parameters are pulsing in time as well as in space. In the phase of corona pulseudpeak, its position adjoins the cathode surface, no further than 0.01 cm. In the initial phase of breakdown, itudextends far beyond the surface, within the distance of 0.03 cm. At the same time, the electron temperatureudchanges in almost full anti-phase to the current: from 9100 K to 19000 K during the corona pulse peak andudfrom 6000 K to 20000 K in initial phases of the breakdown. The average plasma density changes in the rangeud7 × 10¹¹ − 8 × 10¹² cm⁻³ in the first case and 1 × 10¹³ − 5 × 10¹³ cm⁻³ in the case of breakdown.