Hydroxyl Radical Kinetics in Repetitively Pulsed Hydrogen–Air Nanosecond Plasmas
作者： Inchul Choi , Zhiyao Yin , Igor V. Adamovich , Walter R. Lempert
关键词: Hydroxyl radical 、 Nanosecond 、 Number density 、 Laser-induced fluorescence 、 Plasma 、 Plasma diagnostics 、 Atomic physics 、 Torr 、 Hydrogen 、 Materials science
摘要: Absolute hydroxyl radical (OH) concentration is determined in stoichiometric hydrogen-air mixtures at P = 54-94 torr and initial temperature of T 100°C-200°C, which are both functions time, after the application a single approximately 25-ns-duration 20-kV discharge pulse 60 μs final variable-length burst pulses, using single-photon laser-induced fluorescence (LIF). Relative LIF signal levels put on an absolute number density scale by means calibration with standard atmospheric-pressure near-adiabatic Hencken flat-flame burner. By obtaining OH data plasma flame correcting for differences collisional quenching vibrational energy transfer rates, has been determined. For pulse, temporal profile found to rise rapidly during ~0.1 ms initiation decay relatively slowly, characteristic time ~1 ms. In repetitive mode, observed first ten pulses (0.25 ms) then level off near steady-state plateau. all cases, large secondary also observed, clearly indicative ignition, ignition ranging from 5 10 ms, temperatures 100 °C 200°C pressures range torr. Plasma kinetic modeling predictions capture this trend quantitatively, full 22-hydrogen-air-chemical-reaction set reduced 9-reaction set.
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