Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design
This study introduces an innovative approach involving the injection of hydrogen into a low-swirl, non-premixed flame, which operates with gaseous fuels derived from an air-blast atomizer designed for aero-engine applications. The aim is to characterize how hydrogen enrichment influences flame struc...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Aerospace |
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| Online Access: | https://www.mdpi.com/2226-4310/11/1/43 |
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| author | Sara Bonuso Pasquale Di Gloria Guido Marseglia Ramón A. Otón Martínez Ghazanfar Mehdi Zubair Ali Shah Antonio Ficarella Maria Grazia De Giorgi |
| author_facet | Sara Bonuso Pasquale Di Gloria Guido Marseglia Ramón A. Otón Martínez Ghazanfar Mehdi Zubair Ali Shah Antonio Ficarella Maria Grazia De Giorgi |
| author_sort | Sara Bonuso |
| collection | DOAJ |
| description | This study introduces an innovative approach involving the injection of hydrogen into a low-swirl, non-premixed flame, which operates with gaseous fuels derived from an air-blast atomizer designed for aero-engine applications. The aim is to characterize how hydrogen enrichment influences flame structures while maintaining a constant thermal output of 4.6 kW. Using high-speed chemiluminescence imaging, three fueling conditions were compared: the first involved pure methane/air, while the second and third conditions introduced varying levels of hydrogen to an air–methane mixture. The results reveal significant effects of hydrogen enrichment on flame characteristics, including a slightly shorter length and a wider angle attributed to heightened expansion within the Combustion Recirculation Zone. Moreover, the emission of UV light underwent considerable changes, resulting in a shifted luminosity zone and reduced variance. To delve deeper into the underlying mechanisms, the researchers employed Proper Orthogonal Decomposition (POD) and Spectral Proper Orthogonal Decomposition (SPOD) analyses, showing coherent structures and energetic modes within the flames. Hydrogen enrichment led to the development of smaller structures near the nozzle exit, accompanied by longitudinal oscillations and vortex shedding phenomena. These findings contribute to an advanced understanding of hydrogen’s impact on flame characteristics, thereby propelling efforts toward improved flame stability. Additionally, these insights hold significance in the exploration of hydrogen as an alternative energy source with potential environmental benefits. |
| first_indexed | 2024-03-08T11:09:02Z |
| format | Article |
| id | doaj.art-0cbb40f3e7d8475897199feb8d570901 |
| institution | Directory Open Access Journal |
| issn | 2226-4310 |
| language | English |
| last_indexed | 2024-03-08T11:09:02Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Aerospace |
| spelling | doaj.art-0cbb40f3e7d8475897199feb8d5709012024-01-26T14:12:23ZengMDPI AGAerospace2226-43102023-12-011114310.3390/aerospace11010043Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine DesignSara Bonuso0Pasquale Di Gloria1Guido Marseglia2Ramón A. Otón Martínez3Ghazanfar Mehdi4Zubair Ali Shah5Antonio Ficarella6Maria Grazia De Giorgi7Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, ItalyDepartment of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, ItalyDepartment of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, ItalyCentro Universitario de la Defensa, C/Coronel López Peña s/n, Base Aérea de San Javier, 30720 San Javier, SpainDepartment of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, ItalyDepartment of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, ItalyDepartment of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, ItalyDepartment of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, ItalyThis study introduces an innovative approach involving the injection of hydrogen into a low-swirl, non-premixed flame, which operates with gaseous fuels derived from an air-blast atomizer designed for aero-engine applications. The aim is to characterize how hydrogen enrichment influences flame structures while maintaining a constant thermal output of 4.6 kW. Using high-speed chemiluminescence imaging, three fueling conditions were compared: the first involved pure methane/air, while the second and third conditions introduced varying levels of hydrogen to an air–methane mixture. The results reveal significant effects of hydrogen enrichment on flame characteristics, including a slightly shorter length and a wider angle attributed to heightened expansion within the Combustion Recirculation Zone. Moreover, the emission of UV light underwent considerable changes, resulting in a shifted luminosity zone and reduced variance. To delve deeper into the underlying mechanisms, the researchers employed Proper Orthogonal Decomposition (POD) and Spectral Proper Orthogonal Decomposition (SPOD) analyses, showing coherent structures and energetic modes within the flames. Hydrogen enrichment led to the development of smaller structures near the nozzle exit, accompanied by longitudinal oscillations and vortex shedding phenomena. These findings contribute to an advanced understanding of hydrogen’s impact on flame characteristics, thereby propelling efforts toward improved flame stability. Additionally, these insights hold significance in the exploration of hydrogen as an alternative energy source with potential environmental benefits.https://www.mdpi.com/2226-4310/11/1/43flame structurehydrogen-enrichmentlean burninghigh-speed chemiluminescenceproper orthogonal decomposition |
| spellingShingle | Sara Bonuso Pasquale Di Gloria Guido Marseglia Ramón A. Otón Martínez Ghazanfar Mehdi Zubair Ali Shah Antonio Ficarella Maria Grazia De Giorgi Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design Aerospace flame structure hydrogen-enrichment lean burning high-speed chemiluminescence proper orthogonal decomposition |
| title | Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design |
| title_full | Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design |
| title_fullStr | Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design |
| title_full_unstemmed | Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design |
| title_short | Investigation into the Effect of H<sub>2</sub>-Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design |
| title_sort | investigation into the effect of h sub 2 sub enriched conditions on the structure and stability of flames in a low swirl combustor derived from aero engine design |
| topic | flame structure hydrogen-enrichment lean burning high-speed chemiluminescence proper orthogonal decomposition |
| url | https://www.mdpi.com/2226-4310/11/1/43 |
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