Processes in high-temperature air involving molecules and atoms in excited electron states

Лосев, С. А.; Yarygina, V. N.

doi:10.1134/s0018151x10010074

Cited by 1 publication

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“…One can see that the concentration of both N 2 and O 2 increases dramatically as soon as the temperature diminishes. The high concentrations of molecular nitrogen after the front will produce intense fluorescence emission lines from the second positive system of N 2 at 295, 310, 335, and 357 nm as soon as the temperature is higher than 6000 K [ Capitelli et al , ; Losev and Yarygina , ; Becker et al , ; Chauveau et al , ; Laux et al , ; Chauveau et al , ], which occurs closely to r = 3 cm (Figures and ). Between the hot core and the shock front, the concentrations of OH, NO, and NO 2 are much larger due to lower temperatures.…”

Section: Axisymmetric Radiative Shocks In Airmentioning

confidence: 99%

On the dynamics of hot air plasmas related to lightning discharges: 1. Gas dynamics

et al. 2014

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In this paper, we first study the dynamics of hot shocks in air in cylindrical geometry coupled to multiband radiation transport and detailed air chemistry. The wide energy and length scale ranges which are covered herein includes and exceeds the ones of first and subsequent return strokes happening during lightning discharges. An emphasis is put on the NO x production and the optical power emitted by strong shocks as the ones generated by Joule heating of the air from intense current flows. The production rate of NO x , which is useful for atmospheric global modeling, is found to be between 4.5 × 10 16 and 8.6 × 10 16 molecules/J for all computed cases, which is in agreement with the literature. Two different radiation transport methods are used to characterize the variability of the results according to the radiation transport method. With the exact radiation solver, we show that between 15 and 40% of the energy is lost by radiation, with a percentage between 20 and 25% for averaged lightning energies. The maximal visible peak is between 7 × 10 8 W/m and 3 × 10 7 W/m obtained for, respectively, a 19 kJ/cm and a 28 J/cm energy input. The mean radiated powers in the visible range are found between 9 × 10 6 W/m and 2 × 10 5 W/m for the energies just mentioned. We discuss the agreement of these values with previous studies.

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