Schmitz, Robert Martin (2024)
Modeling Nanoparticle Formation in Reactive Flows with Quadrature-based Moment Methods.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00026764
Ph.D. Thesis, Primary publication, Publisher's Version
Text
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Modeling Nanoparticle Formation in Reactive Flows with Quadrature-based Moment Methods | ||||
Language: | English | ||||
Referees: | Hasse, Prof. Dr. Christian ; Ferraro, Prof. Dr. Federica | ||||
Date: | 14 March 2024 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | 133 Seiten in verschiedenen Zählungen | ||||
Date of oral examination: | 20 February 2024 | ||||
DOI: | 10.26083/tuprints-00026764 | ||||
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: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-267648 | ||||
Classification DDC: | 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering | ||||
Divisions: | 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS) | ||||
TU-Projects: | PTJ|03SF0566R0|NAMOSYN EC/H2020|821418|ESTiMatE |
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Date Deposited: | 14 Mar 2024 13:13 | ||||
Last Modified: | 12 Apr 2024 11:43 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/26764 | ||||
PPN: | 516336703 | ||||
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