Laser-based measurements of gas-phase chemistry in non-equilibrium pulsed nanosecond discharges |
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Authors: | Fr d ric Grisch, Guy-Alexandre Grandin, Dominique Messina,Brigitte Attal-Tr tout |
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Affiliation: | aOffice national d'études et de recherches aérospatiales, Fort de Palaiseau, 91761 Palaiseau cedex, France |
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Abstract: | Detailed experimental investigation of a non-equilibrium nanosecond pulsed discharge in premixed CH4/air mixtures at atmospheric pressure has been carried out. The experiments demonstrated significant reductions in ignition delay and increased lean burn capability relative to conventional spark ignition. Advanced laser diagnostics have been used to identify the physical processes which lead to these improvements. The electron temperature and density properties were measured using laser Thomson scattering (LTS). Temperature measurements were performed using N2 CARS thermometry to quantify the energy transfer in the gas mixture. Effect of the discharge on the local temperature shows the existence of the ignition of the gas mixture for equivalence ratio between 0.7 and 1.3. Fast development of a flame kernel is then observed. The experiment also shows that the flame can be sustained above the discharge due the repetitive ignition of the flame at the plasma repetition rate. Finally, OH and CH PLIF experiments were performed to confirm the large OH and CH streamer-induced production over the discharge volume. To cite this article: F. Grisch et al., C. R. Mecanique 337 (2009). |
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Keywords: | Combustion Nanosecond discharge Ignition Laser diagnostic Electron Temperature OH CHMots-clé s: Combustion Dé charge impulsionnelle nanoseconde Allumage Diagnostic laser Tempé rature É lectron OH CH |
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