Temporal evolution of temperature and OH density produced by nanosecond repetitively pulsed discharges in water vapour at atmospheric pressure

Abstract : We report on an experimental study of the temporal evolution of OH density and gas temperature in spark discharges created by nanosecond repetitively pulsed discharges in pure water vapour at 475 K and atmospheric pressure. The plasma was generated by 20 kV, 20 ns pulses, at a repetition frequency of 10 kHz. The temperature was measured during the discharge by optical emission spectroscopy of the second positive system of N2, and between two discharges by two-colour OH-planar laser induced fluorescence (OH-PLIF) using two pairs of rotational transitions. Between two successive discharges, the relative density of OH was measured by OH-PLIF and was found to decay very slowly, with a 1/e decay time of about 50 µs. With the use of a chemical kinetics model, the OH density was placed on an absolute scale.
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https://hal-supelec.archives-ouvertes.fr/hal-01073065
Contributor : Stéphanie Douesnard <>
Submitted on : Wednesday, October 8, 2014 - 5:56:29 PM
Last modification on : Thursday, July 4, 2019 - 11:00:03 AM

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F.P. Sainct, D. Lacoste, Mike Kirkpatrick, Emmanuel Odic, C. O. Laux. Temporal evolution of temperature and OH density produced by nanosecond repetitively pulsed discharges in water vapour at atmospheric pressure. Journal of Physics D: Applied Physics, IOP Publishing, 2014, 47 (7), pp.075204. ⟨10.1088/0022-3727/47/7/075204⟩. ⟨hal-01073065⟩

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