Combined-cycle power plant '500 MW on a single shaft' (AG TURBO II). Project 'Power Plant Systems'. Project 3.3.1: Modelling of piloted premixed combustion, analysis of the SIEMENS PG combustion chamber Final report / GuD-Kraftwerk '500 MW auf einer Welle' (AG TURBO II). Teilverbundprojekt 'Kraftwerk-Systeme'. Vorhaben 3.3.1: Modellierung pilotierter Mehrfachbrennersysteme, Analyse der SIEMENS PG Brennkammer Abschlussbericht

Demands on modern gas turbine systems are high efficiency and low emissions. Due to that nearly all gas turbine systems use piloted premixed combustion. Modeling of combustion processes withComputational Flow Dynamics CFD suffers from the complexity of combustion chemistry. The direct application of kinetics leads to hugh and stiff differential equation systems, which are impossible to solve in 3D flow simulation. Hence normally so called reduced mechanisms are used which are not be able to model turbulent premixed combustion with flame interaction correctly. Therefore in this study a new combustion model, the 'intrinsic low dimensional manifold' ILDM model was used together with the presumed 'probability density function' PDF method to get lookup tables, which can be accessed by a commercial CFD program. The result has been tested by direct comparison with experiments of an industrial burner system. It has been shown that this approach gives a significant improvement compared to standard combustion models. Moreover it is possible to get additional information on concentration of species directly from the simulation which were not available in the past. So this study results in a new powerful tool that is available for increasing both efficiency and environmental care in fossil power generation. (orig.) / SIGLE / Available from TIB Hannover: F04B609 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / Bundesministerium fuer Wirtschaft und Technologie, Bonn (Germany) / DE / Germany