Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions
The initial mechanism of cellular instabilities on the flame surface was investigated experimentally. Firstly, mono-dispersed ethanol droplets were created via the Wilson cloud principle in a spherical combustion chamber, and aerosol ethanol/air flame propagation was tracked under microgravity condi...
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Académie des sciences
2023-04-01
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| Series: | Comptes Rendus. Mécanique |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.174/ |
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| author | Kaya Eyice, Deniz Halter, Fabien Yozgatlıgil, Ahmet Gökalp, İskender Chauveau, Christian |
| author_facet | Kaya Eyice, Deniz Halter, Fabien Yozgatlıgil, Ahmet Gökalp, İskender Chauveau, Christian |
| author_sort | Kaya Eyice, Deniz |
| collection | DOAJ |
| description | The initial mechanism of cellular instabilities on the flame surface was investigated experimentally. Firstly, mono-dispersed ethanol droplets were created via the Wilson cloud principle in a spherical combustion chamber, and aerosol ethanol/air flame propagation was tracked under microgravity conditions. Schlieren images revealed that at the beginning of the cellular structure formation, dark spots formed linking to the signal loss in a density gradient. This phenomenon is assumed to be local extinction and quenching on the flame front due to either liquid droplets’ presence or evaporation. To further investigate the observed phenomenon, stagnation flame experiments were performed for rich propane/air gaseous flames with isolated ethanol droplet injection. The evidence for the local extinction on the flame surface due to droplet passage was found via the Chemiluminescence method. The intrinsic instabilities were found to be triggered by the droplets in cases where the flame cannot recover its initial state. |
| format | Article |
| id | doaj-art-82ae451bde224b15a8c7ab6ba0ab1532 |
| institution | Kabale University |
| issn | 1873-7234 |
| language | English |
| publishDate | 2023-04-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Mécanique |
| spelling | doaj-art-82ae451bde224b15a8c7ab6ba0ab15322025-02-07T13:47:30ZengAcadémie des sciencesComptes Rendus. Mécanique1873-72342023-04-01351S2415610.5802/crmeca.17410.5802/crmeca.174Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditionsKaya Eyice, Deniz0https://orcid.org/0000-0002-5753-6522Halter, Fabien1Yozgatlıgil, Ahmet2Gökalp, İskender3Chauveau, Christian4CNRS-INSIS, Institut de Combustion, Aérothermique, Réactivité et Environnement, Orléans, 45071, France; Department of Mechanical Engineering, Middle East Technical University, Ankara, 06800, Turkey; Université d’Orléans, Orléans, 45100, FranceCNRS-INSIS, Institut de Combustion, Aérothermique, Réactivité et Environnement, Orléans, 45071, France; Université d’Orléans, Orléans, 45100, FranceDepartment of Mechanical Engineering, Middle East Technical University, Ankara, 06800, TurkeyCNRS-INSIS, Institut de Combustion, Aérothermique, Réactivité et Environnement, Orléans, 45071, France; Department of Mechanical Engineering, Middle East Technical University, Ankara, 06800, TurkeyCNRS-INSIS, Institut de Combustion, Aérothermique, Réactivité et Environnement, Orléans, 45071, FranceThe initial mechanism of cellular instabilities on the flame surface was investigated experimentally. Firstly, mono-dispersed ethanol droplets were created via the Wilson cloud principle in a spherical combustion chamber, and aerosol ethanol/air flame propagation was tracked under microgravity conditions. Schlieren images revealed that at the beginning of the cellular structure formation, dark spots formed linking to the signal loss in a density gradient. This phenomenon is assumed to be local extinction and quenching on the flame front due to either liquid droplets’ presence or evaporation. To further investigate the observed phenomenon, stagnation flame experiments were performed for rich propane/air gaseous flames with isolated ethanol droplet injection. The evidence for the local extinction on the flame surface due to droplet passage was found via the Chemiluminescence method. The intrinsic instabilities were found to be triggered by the droplets in cases where the flame cannot recover its initial state.https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.174/Two-phase combustioncellular instabilitieslocal extinctiondroplet-flame interactionflame morphologylaminar flames |
| spellingShingle | Kaya Eyice, Deniz Halter, Fabien Yozgatlıgil, Ahmet Gökalp, İskender Chauveau, Christian Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions Comptes Rendus. Mécanique Two-phase combustion cellular instabilities local extinction droplet-flame interaction flame morphology laminar flames |
| title | Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions |
| title_full | Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions |
| title_fullStr | Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions |
| title_full_unstemmed | Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions |
| title_short | Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions |
| title_sort | investigation of cellular instabilities and local extinction for two phase flames under microgravity conditions |
| topic | Two-phase combustion cellular instabilities local extinction droplet-flame interaction flame morphology laminar flames |
| url | https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.174/ |
| work_keys_str_mv | AT kayaeyicedeniz investigationofcellularinstabilitiesandlocalextinctionfortwophaseflamesundermicrogravityconditions AT halterfabien investigationofcellularinstabilitiesandlocalextinctionfortwophaseflamesundermicrogravityconditions AT yozgatlıgilahmet investigationofcellularinstabilitiesandlocalextinctionfortwophaseflamesundermicrogravityconditions AT gokalpiskender investigationofcellularinstabilitiesandlocalextinctionfortwophaseflamesundermicrogravityconditions AT chauveauchristian investigationofcellularinstabilitiesandlocalextinctionfortwophaseflamesundermicrogravityconditions |