Research Area C: Lead examples
Chemically reacting flows are influenced significantly by the presence of walls. This applies to various processes of practical and scientific relevance, such as the formation of pollutants or deposits which are influenced by the presence of walls and catalytic effects. For this reason near-wall reacting flows impact innovative concepts in the fields of energy conversion processes (internal combustion engines, gas turbines, power plants) and chemical engineering. Despite the relevance of near wall reactive flows, underlying mechanisms and their mutual interactions are presently not well understood.
Research area C is investigating the mutual interaction of the underlying mechanisms both experimentally and numerically, using scientifically and technically highly relevant lead examples. The influence of walls (e.g. cylinder, piston) on the combustion of fuel within engines is investigated within the lead example “internal combustion engines”. Also, the effects of fuel or lubricant-films at the walls on the combustion are tackled. The second lead example is the evaporation of urea water solution within the exhaust gas system of IC engines, as it is important for selective catalytic reduction of NOx. The solution is sprayed on the hot surface of the exhaust gas pipe and hereby decomposed into ammonia. Ammonia is reacting with the NOx leading to harmless substances. Research area C is investigating the effect of hot walls on the decomposition of the urea-water solution. Therefore, the newly developed measurement techniques of research area A as well as the isolated models of research area B are needed for the investigation of both lead examples.