Meier,Thorsten

Motivation

More over one fourth of the worldwide CO_2 emissions are caused by road transport, shipping and aviation. Combustion systems solely used in transportation sector, can not be replaced by today's alternative technologies in the next decades. Hence, there is an increasing demand for more efficient systems including low pollutants emissions (CO, unburnt hydrocarbons and NO_X ) to satisfy social and legal requirements. Flame/wall interaction induce various effects on the overall efficiency and pollutant formation, in which this interactions are very strong and become more important due to downsized combustion engines. Catalytic coated walls affords a ways to reduce pollutant formation and optimize the efficiency by increasing reaction rate of the combustion near the wall at lower temperature.

In recent years, computation time increases exponentially and makes it possible to simulate more complex geometries and models. Thus, Computational Fluid Dynamics (CFD) becomes a powerful engineering tool to develop and improve modern combustion engines.

Proceeding

Assessing the influence of wall effects to gas flow in gas turbines, FASTEST (Flow Analysis Solving Transport Equations with Simulated Turbulence) software is used for the LES approach. Several chemical models have to be implemented to allow the evaluation of complex chemistry in gas phase close to wall and of surface chemistry (catalysis) on the wall. Experimental data are available for verification and validation.