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Chemical Kinetics

Reducing pollutant emissions and increasing combustion efficiency while simultaneously taking aspects of economic efficiency into account is one of the greatest challenges in the development of novel combustion technologies. In recent years, modeling and simulation have proved to be excellent new tools for addressing these challenges. Experimental techniques in combination with numerical models are therefore applied rigorously by the Department to predict the reaction kinetics of combustion processes and the formation of pollutants for various fuels, and in this way to achieve progress in the optimization of combustion processes.

Activities are centered on processes of technological combustion systems controlled by chemical kinetics, such as pollutant formation, ignition behavior, heat release and flame velocities. Another key focus in this regard is on biogenic and synthetic fuels and fuel mixtures, which have attracted strong interest in recent years in the context of the CO2 emissions problem.

Studying key reactions in order to describe pollutant formation and/or reduction, e.g. for CO, NOx, UHCs, soot precursors (PAHs) and soot. Studying the elementary kinetics of initiation steps in fuel pyrolysis and oxidation
Determining the influence of fuel quality (impurities, additives, etc.) on ignition and combustion properties
Laser mass spectrometry for the simultaneous detection of molecules, radicals, soot precursor particles and of primary soot. The method is used to elucidate reaction pathways of soot formation and to monitor pollutants in technical exhaust systems
Validation of reaction mechanisms for gaseous and liquid fuels at technically relevant pressures by determining ignition delay times, laminar flame speeds and the product distribution of stable species
Pollutant formation and reduction mechanisms (NOx, CO, unburned hydrocarbons, PAHs) in stationary and non-stationary combustion processes
Designing model fuels for technologically relevant fuels and propellants
Determining the combustion characteristics of gaseous and liquid fuels from biogenic sources and industrial processes
Determining fuel characteristics in respect of flame stability (ignition, heat release)
Development and reduction of chemical kinetic schemes: establishment of a hierarchical, structured reaction model based on sub-models for the prediction of combustion processes
Computing reaction rate coefficients of individual elementary reactions with the aid of quantum chemistry methods
Computing substance-specific physicochemical properties with the aid of quantum chemistry methods
Chemical-kinetic process analysis for combustion in CO2 atmosphere with special reference to CO2 sequestration
Kontakt
Prof. Dr. rer. nat. Uwe Riedel
Head of Department Chemical Kinetics

German Aerospace Center

Institute of Combustion Technology

Stuttgart

Tel.: +49 711 6862-351

Fax: +49 711 6862-1351

Arbeitsgebiete
Schlüsselreaktionen
Brennstoffqualität
Laser- Massenspektrometrie
Validierung
Schadstoffbildung
Modellbrennstoffe
Verbrennungs- eigenschaften
Flammenstabiltät
Entwicklung - Reduktion
Reaktions- geschwindigkeits- koeffizienten
Moleküleigenschaften
Oxyfuel Verbrennung
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