Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame
Plasma-assisted combustion has the potential to improve flame stability and combustion performance. Among all the different types of plasma source, nanosecond repetitively pulsed (NRP) discharges have received a lot of attention since they can produce nonequilibrium plasma containing excited species...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Applications in Energy and Combustion Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666352X23000195 |
| _version_ | 1797802092871548928 |
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| author | Julien Lambert Sylvain Coulombe Gilles Bourque Jeffrey Bergthorson |
| author_facet | Julien Lambert Sylvain Coulombe Gilles Bourque Jeffrey Bergthorson |
| author_sort | Julien Lambert |
| collection | DOAJ |
| description | Plasma-assisted combustion has the potential to improve flame stability and combustion performance. Among all the different types of plasma source, nanosecond repetitively pulsed (NRP) discharges have received a lot of attention since they can produce nonequilibrium plasma containing excited species, ionized species, and radicals. These species can then accelerate combustion processes by opening new kinetic pathways. NRP discharges can also affect combustion through thermal and hydrodynamic pathways. This study investigates the hydrodynamic effect of NRP discharges produced throughout the surface of a lean premixed methane-air flame at atmospheric pressure. Time-resolved imaging was used to study the effect of the NRP discharges pulse repetition frequency (PRF). The imaging showed that the flame stabilizes further upstream as the PRF increases and that the flame remains steady and does not relax between consecutive discharges. The flame relaxation was also studied using time-resolved imaging after abruptly turning off the NRP discharges. This revealed that the flame takes about 50ms to completely relax to its unactuated position. Particle image velocimetry showed that the NRP discharges substantially reduce the flow velocity in their vicinity, which causes the flame to move upstream and stretch. The induced stretch was found to increase flame speed though nonequidiffusive effects. The experiment was repeated with a lean premixed propane-air flame. In those conditions, the flame speed was unaffected by the NRP discharges, as expected for a mixture that is less sensitive to nonequidiffusive effects. Hence, the hydrodynamic effect of NRP discharges appears to dominate over the thermal and kinetic pathways for the conditions investigated. |
| first_indexed | 2024-03-13T05:00:27Z |
| format | Article |
| id | doaj.art-2afb672ace294a0198d8048f482c0022 |
| institution | Directory Open Access Journal |
| issn | 2666-352X |
| language | English |
| last_indexed | 2024-03-13T05:00:27Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Applications in Energy and Combustion Science |
| spelling | doaj.art-2afb672ace294a0198d8048f482c00222023-06-17T05:21:05ZengElsevierApplications in Energy and Combustion Science2666-352X2023-06-0114100130Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flameJulien Lambert0Sylvain Coulombe1Gilles Bourque2Jeffrey Bergthorson3Alternative Fuels Laboratory, McGill University, Montreal, H3A 0C3, Canada; Corresponding author.Catalytic and Plasma Processing Engineering, McGill University, Montreal, H3A 0C5, CanadaAlternative Fuels Laboratory, McGill University, Montreal, H3A 0C3, Canada; Siemens Energy Canada Limited, Dorval, H9P 1A5, CanadaAlternative Fuels Laboratory, McGill University, Montreal, H3A 0C3, CanadaPlasma-assisted combustion has the potential to improve flame stability and combustion performance. Among all the different types of plasma source, nanosecond repetitively pulsed (NRP) discharges have received a lot of attention since they can produce nonequilibrium plasma containing excited species, ionized species, and radicals. These species can then accelerate combustion processes by opening new kinetic pathways. NRP discharges can also affect combustion through thermal and hydrodynamic pathways. This study investigates the hydrodynamic effect of NRP discharges produced throughout the surface of a lean premixed methane-air flame at atmospheric pressure. Time-resolved imaging was used to study the effect of the NRP discharges pulse repetition frequency (PRF). The imaging showed that the flame stabilizes further upstream as the PRF increases and that the flame remains steady and does not relax between consecutive discharges. The flame relaxation was also studied using time-resolved imaging after abruptly turning off the NRP discharges. This revealed that the flame takes about 50ms to completely relax to its unactuated position. Particle image velocimetry showed that the NRP discharges substantially reduce the flow velocity in their vicinity, which causes the flame to move upstream and stretch. The induced stretch was found to increase flame speed though nonequidiffusive effects. The experiment was repeated with a lean premixed propane-air flame. In those conditions, the flame speed was unaffected by the NRP discharges, as expected for a mixture that is less sensitive to nonequidiffusive effects. Hence, the hydrodynamic effect of NRP discharges appears to dominate over the thermal and kinetic pathways for the conditions investigated.http://www.sciencedirect.com/science/article/pii/S2666352X23000195Plasma-assisted combustionNanosecond repetitively pulsed dischargesParticle image velocimetryStagnation flames |
| spellingShingle | Julien Lambert Sylvain Coulombe Gilles Bourque Jeffrey Bergthorson Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame Applications in Energy and Combustion Science Plasma-assisted combustion Nanosecond repetitively pulsed discharges Particle image velocimetry Stagnation flames |
| title | Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame |
| title_full | Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame |
| title_fullStr | Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame |
| title_full_unstemmed | Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame |
| title_short | Hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame |
| title_sort | hydrodynamic effect of nanosecond repetitively pulsed discharges produced throughout a laminar stagnation flame |
| topic | Plasma-assisted combustion Nanosecond repetitively pulsed discharges Particle image velocimetry Stagnation flames |
| url | http://www.sciencedirect.com/science/article/pii/S2666352X23000195 |
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