Abstract
In this short communication we report the results of measurements of the number densities of O3, NO and NO2 in the afterglow of a dielectric barrier discharge. Detailed modelling of plasma processes in a DBD is a challenging task and this data is necessary for verification of numerical model. The DBD in air produced only [O3] up to ~1016 cm-3 and [NO] up to ~5×1014 cm-3 that increased with discharge power linearly. In air fuel mixtures [O3] was an order of magnitude smaller, it decreased with [CH4]. In methane-air mixture NO was not detected, but [NO2] up to ~1015 cm-3 appeared instead.
Highlights
Low temperature nonequilibrium plasma is an efficient tool for speeding up chemical processes relative to combustion, and extensive studies of plasma ignition and plasmaassisted combustion are under way at present [1, 2]
Its current density is on the order of 100 mA cm-2 and voltage across the electrodes with 1 mm gap in air-fuel mixture is about 6 kV
Dielectric barrier discharge (DBD) consists of a large number of streamers of a nanosecond duration with a large E/N in their heads and is able to ionize, dissociate and excite molecules efficiently
Summary
Low temperature nonequilibrium plasma is an efficient tool for speeding up chemical processes relative to combustion, and extensive studies of plasma ignition and plasmaassisted combustion are under way at present [1, 2]. A repetitively pulsed nanosecond discharge with a low duty cycle [3] in an air-fuel flow permitted to achieve ignition, flame holding and steady combustion downstream of the discharge at low pressure of 60 Torr. The reduced electric field E/N in this type of discharge is on the order of hundreds of Td and large numbers of energetic electrons efficiently dissociate, ionize and excite gas molecules.
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