Laser spectroscopic investigation of advanced combustion concepts in a high swirl research engine and a high pressure vessel


Dewor, Raphael © Copyright: Lehrstuhl fuer Technische Thermodynamik der RWTH Aachen


Raphael Dewor

Measurement Systems Engineering


+49 241 80 90467



The Excellency Cluster – „The Fuel Science Center“

The goal of the Cluster of Excellence “The Fuel Science Center” (FSC) is the interdisciplinary investigation of new synthetic fuels and chemicals generated from biomass. It aims at finding the best combination of selection and use of products and production processes. The research focuses on a holistic optimization with strong interaction of research projects in the fields of chemistry, engineering and economics.
Further information about the work and organization of the FSC can be found on the website of the
Fuel Design Center .



In the current energy supply discussion, the sustainable use of resources is still focused. Apart from lowering fuel consumption, reducing emissions of greenhouse gases and pollutants like soot, lowering nitrogen oxides and unburned hydrocarbons are focused by both industry and research. To cover global energy requirements, combustion engines will still be used as energy conversion machines in the near future, therefore the efficiency and the emission of pollutants should be optimized.


Research project

This research project deals with the improvement of the physical comprehension of injection, mixture composition and combustion processes in a high-pressure chamber. This combustion technique resembles the „reactivity controlled compression ignition“ process, in which a hardly flammable fuel is injected earlier to achieve a high homogenization. Then, a highly flammable fuel is used for the ignition of the whole mixture.

For this process, a fast combustion at low temperatures with very low emissions of nitrogen oxides and soot and a high efficiency at the same time is advantageous. With that, an advantage of consumption compared to the conventional Diesel engine can be achieved and exhaust gas aftertreatment can be reduced to a minimum.

With high-developed laser diagnostics, temperatures and concentrations can be quantified without influencing the combustion process. Quantitative CO and unburned hydrocarbon concentration measurements will also be attempted by this diagnostic.


Research goals

The goal of this project is the investigation of novel combustion techniques in combination with newly designed fuels from the cluster of excellence. For that purpose, injection, combustion process, and pollutant formation will be characterized. For the characterization, laser-optical measurement techniques like laser-induced fluorescence, Raman-scattering, Mie-scattering, and High-Speed imaging are used.

  OH-Luminescence in hot combustion of a fuel jet Copyright: © Lehrstuhl fuer Technische Thermodynamik der RWTH Aachen OH-Luminescence in hot combustion of a fuel jet