Study of spatial characteristics of the incomplete surface discharge in atmospheric-pressure air |
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Authors: | V A Ivchenko V P Zakharov and P E Timchenko |
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Institution: | (1) V.A. Fock Institute of Physics, St. Petersburg University, 198504 St. Petersburg, Russia;(2) The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-952 Gdańsk, Poland |
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Abstract: | Spectra of plasma of the incomplete surface discharge in atmospheric-pressure air were measured. Bands of the systems 2+, 1+, and 1− of nitrogen were identified. It was shown that periodic excitation at the C
3Π
u
nitrogen level results in local equilibrium characterized by a vibrational temperature of 2250 K. For the 1+ band system of nitrogen, the structure of rotational transitions was resolved; it was found that the distribution in the
1+ band system is significantly nonequilibrium due to the A
3Σ
u
+ level metastability. Transverse and longitudinal sections of the plasma band were scanned. It was found that the transverse
distribution of the emission intensity has a maximum at a distance of 1 mm from the electrode edge followed by an exponential
decay. The plasma band width was ∼5 mm. The longitudinal discharge structure consisted of a system of microchannels (with
a characteristic diameter of 0.4 mm) with diffuse overlapping. The average channel density was 10–15 cm−1. It was shown that the spatial distribution of incomplete discharge plasma is characterized by high stability against wide-range
variations of discharge electrical characteristics. For example, as the excitation voltage varies within 2–6 kV, the plasma
band width changed by no more than 1 mm, and the vibrational temperature varied within 10–12%. |
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Keywords: | |
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