Schmitz, Robert Martin (2024)
Modeling Nanoparticle Formation in Reactive Flows with Quadrature-based Moment Methods.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00026764
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
The alternative fuel oxymethylene ether (OME) combines CO2-neutral and simultaneously almost sootless combustion under the condition of a sustainable synthesis. A precise understanding of its mechanisms that lead to reduced soot emissions is necessary for the efficient utilization of this valuable and limited alternative to fossil fuels. This study examines the impact of mixing processes between fuel and oxidator, as well as the influence of OME fuel on soot formation. The investigation is structured into six scientific objectives, isolating influencing factors systematically. Laminar premixed and counterflow diffusion flame configurations are numerically considered. For the soot modeling, the simulations use direct chemistry coupled with two distinct quadrature-based moment methods. The modeling of the physical and chemical processes enables the examination and explanation of the impact of individual factors throughout the entire chain of events on a mechanistic level. The validation of the soot modeling shows that numerical results are congruent with the experimental results. Strain has minimal quantitative influence on the soot processes, whereas fuel dilution significantly reduces all soot sub-processes. Adding OME3 into sooting ethylene flames causes a substantial reduction in soot aggregates and shows only a slight influence on nanoparticles. The decrease is related to the OME3 decomposition in the gas phase towards mainly formaldehyde (CH2O) without a direct reaction pathway to species crucial to soot formation. Therefore, soot precursor species such as acetylene (C2H2) are reduced leading to weakened soot growth processes. An increase in the OME3 content within the fuel mixture results in a linear decrease in soot volume fraction. The three OMEn variants, OME2, OME3, and OME4, show similar qualitative and quantitative effects on the soot precursors and formation. Closer investigations of the particle size distribution provide further insights into the underlying processes.
| Typ des Eintrags: | Dissertation | ||||
|---|---|---|---|---|---|
| Erschienen: | 2024 | ||||
| Autor(en): | Schmitz, Robert Martin | ||||
| Art des Eintrags: | Erstveröffentlichung | ||||
| Titel: | Modeling Nanoparticle Formation in Reactive Flows with Quadrature-based Moment Methods | ||||
| Sprache: | Englisch | ||||
| Referenten: | Hasse, Prof. Dr. Christian ; Ferraro, Prof. Dr. Federica | ||||
| Publikationsjahr: | 14 März 2024 | ||||
| Ort: | Darmstadt | ||||
| Kollation: | 133 Seiten in verschiedenen Zählungen | ||||
| Datum der mündlichen Prüfung: | 20 Februar 2024 | ||||
| DOI: | 10.26083/tuprints-00026764 | ||||
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/26764 | ||||
| Kurzbeschreibung (Abstract): | The alternative fuel oxymethylene ether (OME) combines CO2-neutral and simultaneously almost sootless combustion under the condition of a sustainable synthesis. A precise understanding of its mechanisms that lead to reduced soot emissions is necessary for the efficient utilization of this valuable and limited alternative to fossil fuels. This study examines the impact of mixing processes between fuel and oxidator, as well as the influence of OME fuel on soot formation. The investigation is structured into six scientific objectives, isolating influencing factors systematically. Laminar premixed and counterflow diffusion flame configurations are numerically considered. For the soot modeling, the simulations use direct chemistry coupled with two distinct quadrature-based moment methods. The modeling of the physical and chemical processes enables the examination and explanation of the impact of individual factors throughout the entire chain of events on a mechanistic level. The validation of the soot modeling shows that numerical results are congruent with the experimental results. Strain has minimal quantitative influence on the soot processes, whereas fuel dilution significantly reduces all soot sub-processes. Adding OME3 into sooting ethylene flames causes a substantial reduction in soot aggregates and shows only a slight influence on nanoparticles. The decrease is related to the OME3 decomposition in the gas phase towards mainly formaldehyde (CH2O) without a direct reaction pathway to species crucial to soot formation. Therefore, soot precursor species such as acetylene (C2H2) are reduced leading to weakened soot growth processes. An increase in the OME3 content within the fuel mixture results in a linear decrease in soot volume fraction. The three OMEn variants, OME2, OME3, and OME4, show similar qualitative and quantitative effects on the soot precursors and formation. Closer investigations of the particle size distribution provide further insights into the underlying processes. |
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| Status: | Verlagsversion | ||||
| URN: | urn:nbn:de:tuda-tuprints-267648 | ||||
| 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 Simulation reaktiver Thermo-Fluid Systeme (STFS) |
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| TU-Projekte: | PTJ|03SF0566R0|NAMOSYN EC/H2020|821418|ESTiMatE |
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| Hinterlegungsdatum: | 14 Mär 2024 13:13 | ||||
| Letzte Änderung: | 15 Mär 2024 07:55 | ||||
| PPN: | |||||
| Referenten: | Hasse, Prof. Dr. Christian ; Ferraro, Prof. Dr. Federica | ||||
| Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 20 Februar 2024 | ||||
| Export: | |||||
| Suche nach Titel in: | TUfind oder in Google | ||||
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