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%0 Thesis %A Jacobs, Sascha %T Experimentelle und theoretische Untersuchung der Reaktionskinetik im Nieder- und Hochtemperaturbereich von verschiedenen Di-Ethern: OMEₓ und DEM %I Rheinisch-Westfälische Technische Hochschule Aachen %V Dissertation %C Aachen %M RWTH-2025-04649 %P 1 Online-Ressource : Illustrationen %D 2025 %Z Veröffentlicht auf dem Publikationsserver der RWTH Aachen University %Z Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2025 %X The present work aims is to gain a comprehensive insight into the chemical kinetics of combustion processes in the high- and low-temperature range of alternative, CO2-neutral fuels. In this context, oxymethylene ethers (OMEx: CH3O-[CH2O]x-CH3) and diethoxymethane (DEM: C2H5O-CH2O-C2H5) have been identified as promising substitutes or additives for fossil diesel fuel in the transportation sector due to their chemical and physical properties. A main focus of the investigation is the oxidation behavior of dimethoxymethane (OME1), as well as the influence of the molecular structure on the combustion kinetics by extension of the CH2O group within the molecular structure of OME1 or replacing the methyl group by an ethyl group at the terminals. Consistent and detailed chemical kinetic reaction mechanisms were developed in order to gain a fundamental understanding of the combustion chemistry and for computational modeling of the combustion process. In order to consider the chemical processes that occur during ignition delay separately from the physical processes, fundamental investigations of the ignition characteristics were carried out in a shock tube and a rapid compression machine depending on pressure, temperature, and equivalence ratio under engine-relevant conditions. A systematic investigation of the ignition behavior showed that increasing the chain length, changes the ignition characteristics and increases the reactivity. Furthermore, it was observed that these promising and highly reactive fuel candidates did not exhibit a negative temperature coefficient. Based on numerical investigations of the combustion chemistry, it was shown that despite these differences, these fuels have significant similarities in their complex reaction kinetics. The holistic approach of modeling and experiments, presented in this work, is essential for a complete fuel consideration and evaluation to ultimately ensure safe and reliable as well as low-emission engine operation. %F PUB:(DE-HGF)11 %9 Dissertation / PhD Thesis %R 10.18154/RWTH-2025-04649 %U https://publications.rwth-aachen.de/record/1011677