Trabold, J. ; Hartl, S. ; Walther, S. ; Johchi, A. ; Dreizler, A. ; Geyer, D. (2024)
Fuel Effects in Turbulent Premixed Pre-vaporised Alcohol/Air Jet Flames.
In: Flow, Turbulence and Combustion : An International Journal published in association with ERCOFTAC, 2021, 106 (2)
doi: 10.26083/tuprints-00023887
Artikel, Zweitveröffentlichung, Verlagsversion
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
To study combustion fundamentals of complex fuels under well-defined boundary conditions, a novel Temperature Controlled Jet Burner (TCJB) system is designed that can stabilise both gaseous or pre-vaporised liquid fuels. In a first experimental exploratory study, piloted turbulent jet flames of pre-vaporised methanol, ethanol, 2-propanol and 2-butanol mixtures are compared to methane/air as a reference fuel. Complementary one-dimensional laminar flame calculations are used to provide flame parameters for comparison. Blow-off and flame length as global flame characteristics are measured over a wide range of equivalence ratios. For fuel rich conditions, blow-off limits correlate well with extinction strain rate calculations. Differing flame lengths from lean to rich conditions are explained partly by different flame wrinkling that is assessed using planar laser-induced fluorescence imaging of the hydroxyl radical (OH-PLIF). A study of Lewis-number effects indicates that they have substantial influence on flame wrinkling. Lean alcohol/air flames, opposed to methane/air, have a Lewis-number greater than unity. This impedes curvature development, which promotes relatively large flame lengths. In contrast, across stoichiometric conditions, all alcohol/air mixture Lewis-numbers decrease significantly. At such conditions, alcohol/air flames show alike or even larger wrinkling compared to methane/air flames. However, quantitatively, the differences in flame length and wrinkling observed among the flames can neither be explained alone by Lewis-number differences, nor other global mixture parameters available from 1D laminar flame calculations. This study shall therefore emphasise the need for more detailed experimental analyses of the full thermochemical state of laminar and turbulent flames fuelled with complex fuels.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Trabold, J. ; Hartl, S. ; Walther, S. ; Johchi, A. ; Dreizler, A. ; Geyer, D. |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Fuel Effects in Turbulent Premixed Pre-vaporised Alcohol/Air Jet Flames |
| Sprache: | Englisch |
| Publikationsjahr: | 18 Dezember 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | Februar 2021 |
| Ort der Erstveröffentlichung: | Dordrecht |
| Verlag: | Springer Science |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Flow, Turbulence and Combustion : An International Journal published in association with ERCOFTAC |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.26083/tuprints-00023887 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/23887 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | To study combustion fundamentals of complex fuels under well-defined boundary conditions, a novel Temperature Controlled Jet Burner (TCJB) system is designed that can stabilise both gaseous or pre-vaporised liquid fuels. In a first experimental exploratory study, piloted turbulent jet flames of pre-vaporised methanol, ethanol, 2-propanol and 2-butanol mixtures are compared to methane/air as a reference fuel. Complementary one-dimensional laminar flame calculations are used to provide flame parameters for comparison. Blow-off and flame length as global flame characteristics are measured over a wide range of equivalence ratios. For fuel rich conditions, blow-off limits correlate well with extinction strain rate calculations. Differing flame lengths from lean to rich conditions are explained partly by different flame wrinkling that is assessed using planar laser-induced fluorescence imaging of the hydroxyl radical (OH-PLIF). A study of Lewis-number effects indicates that they have substantial influence on flame wrinkling. Lean alcohol/air flames, opposed to methane/air, have a Lewis-number greater than unity. This impedes curvature development, which promotes relatively large flame lengths. In contrast, across stoichiometric conditions, all alcohol/air mixture Lewis-numbers decrease significantly. At such conditions, alcohol/air flames show alike or even larger wrinkling compared to methane/air flames. However, quantitatively, the differences in flame length and wrinkling observed among the flames can neither be explained alone by Lewis-number differences, nor other global mixture parameters available from 1D laminar flame calculations. This study shall therefore emphasise the need for more detailed experimental analyses of the full thermochemical state of laminar and turbulent flames fuelled with complex fuels. |
| Freie Schlagworte: | Alcohol/air combustion, Biofuels, Turbulent combustion, Blow-off, Flame length, Extinction strain rate, Lewis-number effects, Flame surface density |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-238879 |
| Zusätzliche Informationen: | Special Issue: Progress in Clean‑Combustion Science and Technology |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Reaktive Strömungen und Messtechnik (RSM) |
| Hinterlegungsdatum: | 18 Dez 2024 12:27 |
| Letzte Änderung: | 19 Dez 2024 10:05 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Fuel Effects in Turbulent Premixed Pre-vaporised Alcohol/Air Jet Flames. (deposited 18 Dez 2024 12:27) [Gegenwärtig angezeigt]
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