Publication: Diagnostics of plasma formed during the oxidation of hydrocarbons in shock waves by electric probes with a conductive and dielectric surface
Дата
2021
Авторы
Smirnov, V. N.
Malyshev, N. S.
Mikhailov, D. I.
Agafonov, G. L.
Vlasov, P. A.
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© 2021 Institute of Physics Publishing. All rights reserved.Experiments were carried out behind shock waves with recoding the electric current flowing through cylindrical probes with a conductive and dielectric surface under a negative (- 9V) potential relative to the walls of the shock tube, with the displacement and total currents measured, respectively. Simultaneously, the signals of chemiluminescent emission from electronically excited OH* (λ = 308 nm) and CH* (λ = 430 nm) radicals were recorded. Experiments were carried out with various lean mixtures of methane and acetylene with oxygen diluted in argon. Preliminary calculations were performed using a theoretical model of an electric probe with a dielectric and conducting surface. Simulations showed that the displacement current on a probe under a negative potential with a dielectric surface is controlled by the chemical ionization rate, the surface area of the probe, and the electric potential. A close correlation was observed between the times of reaching the maximum of the probe current and the maximum of the chemiluminescent emission signals from the electronically excited OH* and CH* radicals.
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Diagnostics of plasma formed during the oxidation of hydrocarbons in shock waves by electric probes with a conductive and dielectric surface / Smirnov, V.N. [et al.] // Journal of Physics: Conference Series. - 2021. - 2036. - № 1. - 10.1088/1742-6596/2036/1/012006