Ignition of methane- and n-butane-containing mixtures at high pressures by pulsed nanosecond discharge

A novel experimental scheme to study the ignition of combustible mixtures at high pressures under the action of a high-voltage nanosecond discharge has been developed. The experiments were performed in the combustion chamber of a Rapid Compression Machine (RCM) with a specially designed system of el...

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Veröffentlicht in:Combustion and flame 2015-04, Vol.162 (4), p.1336-1349
Hauptverfasser: Boumehdi, Mohamed A., Stepanyan, Sergey A., Desgroux, Pascale, Vanhove, Guillaume, Starikovskaia, Svetlana M.
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container_end_page 1349
container_issue 4
container_start_page 1336
container_title Combustion and flame
container_volume 162
creator Boumehdi, Mohamed A.
Stepanyan, Sergey A.
Desgroux, Pascale
Vanhove, Guillaume
Starikovskaia, Svetlana M.
description A novel experimental scheme to study the ignition of combustible mixtures at high pressures under the action of a high-voltage nanosecond discharge has been developed. The experiments were performed in the combustion chamber of a Rapid Compression Machine (RCM) with a specially designed system of electrodes. A nanosecond surface dielectric barrier discharge (SDBD) provided two-dimensional low-temperature non-equilibrium plasma in the vicinity of the end plate of the combustion chamber. Radially symmetric plasma channels triggered multi-point ignition of gas mixtures at controlled pressure and temperature. Ignition delay times and energies deposited in the gaseous mixtures by the discharge were measured for different parameters of high voltage pulse, for positive or negative high-voltage pulses. The propagation of the subsequent flame in the combustion chamber was recorded with the help of high repetition rate imaging. Preliminary numerical analysis of the ignition under the action of a pulsed nanosecond discharge has been made; it was shown that production of atomic oxygen by the discharge, will modify the ignition chemistry by perturbation of the radical pool. Experiments and calculations were performed in methane–oxygen and n-butane–oxygen mixtures with equivalence ratios between 0.3 and 1 diluted by 70–76% of Ar or nitrogen for temperatures between 600 and 1000K and pressures between 6 and 16bar.
doi_str_mv 10.1016/j.combustflame.2014.11.006
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The experiments were performed in the combustion chamber of a Rapid Compression Machine (RCM) with a specially designed system of electrodes. A nanosecond surface dielectric barrier discharge (SDBD) provided two-dimensional low-temperature non-equilibrium plasma in the vicinity of the end plate of the combustion chamber. Radially symmetric plasma channels triggered multi-point ignition of gas mixtures at controlled pressure and temperature. Ignition delay times and energies deposited in the gaseous mixtures by the discharge were measured for different parameters of high voltage pulse, for positive or negative high-voltage pulses. The propagation of the subsequent flame in the combustion chamber was recorded with the help of high repetition rate imaging. Preliminary numerical analysis of the ignition under the action of a pulsed nanosecond discharge has been made; it was shown that production of atomic oxygen by the discharge, will modify the ignition chemistry by perturbation of the radical pool. 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subjects Low temperature ignition
Physics
Plasma assisted ignition
Plasma Physics
Rapid Compression Machine
Surface nanosecond dielectric barrier discharge
title Ignition of methane- and n-butane-containing mixtures at high pressures by pulsed nanosecond discharge
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