Nanosecond Repetitively Pulsed Plasmas in Preheated Air at Atmospheric Pressure

Abstract : Atmospheric pressure air plasmas have numerous potential applications that require low power and low gas temperature. The Nanosecond Repetitively Pulsed (NRP) method can generate such plasmas for power budgets lower by several orders of magnitude than traditional plasma generation methods. This study seeks to enlarge the range of application of NRP plasmas to the 300 to 1000 K range. First, we demonstrate the existence of three regimes of the NRP discharge in air at atmospheric pressure and at 1000 K, and then we characterize their chemical, electrical, and thermal properties through optical emission spectroscopy and current-voltage measurements. The three regimes are corona-like (termed C), diffuse-like (D) and filamentary-like (F). The measurements show that the D regime has low levels of emission, gas heating, and electrical conduction current. Furthermore, this regime develops through an initial ionization wave propagating from the anode to the cathode, followed by a faster return wave in the opposite direction. In contrast to the D regime, the F regime emits strongly, heats the gas by several thousand degrees Kelvin, and has tens of amperes of conduction current. Second, we conduct a parametric study on the effects of gas temperature and gap distance on the properties of the D and F regimes and the D-F transition voltage. We find that at a given gas temperature, there is a minimum gap distance required for the existence of the D regime. Using this fact, we were able to extend the domain of existence of the D regime down to ambient temperature.
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https://hal.archives-ouvertes.fr/tel-01939884
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David Z Pai. Nanosecond Repetitively Pulsed Plasmas in Preheated Air at Atmospheric Pressure. Plasmas. Ecole Centrale Paris, 2008. English. ⟨tel-01939884⟩

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