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COMPARATIVE STUDY OF TURBULENCE AND CHEMISTRY MODELS ON SIMULATION RESULTS FOR A METHANE/AIR JET DIFFUSION FLAME

Bart Merci
Department of Mechanics of Flow, Heat and Combustion, Ghent University, St-Pietersnieuwstraat 41, 9000 Gent; and Postdoctoral Fellow of the Fund of Scientific Research - Flanders,Belgium

Alexander Maltsev
Chair of Energy and Powerplant Technology, Department of Mechanical Engineering, Darmstadt University of Technology, Petersenstr. 30, 64287 Darmstadt, Germany

Amsini Sadiki
Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Johannes Janicka
Institute of Energy and Power Plant Technology, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany; Darmstadt Graduate School of Excellence Energy Science and Engineering, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany

Resumo

The importance of different submodels in numerical simulations of a turbulent non-premixed flame, is studied. To that purpose, different types of RANS turbulence models are compared: the standard k − ε model (Jones, 1994), a non-linear k − ε model with a sophisticated transport equation for the dissipation rate ε (Merci, 2002a, 2002b) and a differential second-moment Reynolds stress model (Jones, 1994). Also different chemistry models are considered, from a (constrained) equilibrium model (Bilger, 1983) to an ILDM method (Maas, 1992; Schmidt, 1996). Finally, the interaction between turbulence and chemistry is described at different levels: the classical pre-assumed β-PDF approach is compared to an extended multivariate pre-assumed PDF method (Repp, 2002; Landenfeld, 2002). It is concluded that for the test case under study (Sandia 'Flame D' (Barlow, 1998; TNF, 2003)), the turbulence model has the major effect on the main results, except when chemical species are of interest.