Quantitative Schlieren Diagnostics Applied to a Millisecond Pulsed‑DC Hybrid Discharge in Atmospheric Pressure Air.
Date
2022
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Abstract
The gas temperature of a hybrid discharge in atmospheric pressure air is investigated by
using quantitative schlieren imaging. The discharge is stabilized in a pin-to-plate electrode
geometry and operated in a millisecond pulsed-DC regime with current amplitudes up to
75 mA and a duration of 10 ms, applied at a frequency of 100 Hz. An equilibrium com position model is considered to account for the production of N, O, and NO, which infu ence the Gladstone–Dale coefcient of air at high-gas temperatures. Also, a procedure is
described which allows the determination of the errors introduced in the time-average gas
refraction index due to gas temperature fuctuations. The results show that the axial values
of the gas temperature profles span a large range from~1000 to 5000 K, nearly following
the evolution of the discharge current. The temperature values found agree well with those
reported in the literature for atmospheric pressure air plasmas, ranging from micro-glow to
hybrid discharges.
Description
Keywords
Hybrid discharge., Schlieren technique., Gas temperature., Fluctuations.
Citation
Plasma Chemistry and Plasma Processing
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