Title: A new BML-based RANS modelling for the description of gas turbine typical combustion processes

Authors: A. Maltsev, A. Sadiki, J. Janicka

Addresses: Institute of Energy and Power Plant Technology, TU-Darmstadt, Petersenstr. 30, 64287 Darmstadt, Germany. ' Institute of Energy and Power Plant Technology, TU-Darmstadt, Petersenstr. 30, 64287 Darmstadt, Germany. ' Institute of Energy and Power Plant Technology, TU-Darmstadt, Petersenstr. 30, 64287 Darmstadt, Germany

Abstract: The work is concentrated on the formulation and validation of integral models within RANS framework for the numerical prediction of the premixed and partially premixed flames occurring in gas turbine combustors. The premixed combustion modelling is based on the BML approach coupled to the mixing transport providing variable equivalence ratio. Chemistry is described by means of ILDM model solving transport equations for reaction progress variables conditioned on the flame front. Multivariate presumed PDF model is used for the turbulence-chemistry interaction treatment. Turbulence is modelled using the second moment closure (SMC) and the standard κ-ε model as well. The influence of non-gradient turbulent transport is investigated comparing the gradient diffusion closure and the solution of the scalar flux transport equations. Different model combinations are assessed simulating several premixed and partially premixed flame configurations and comparing results to the experimental data. The proposed model provides good predictions particularly in combination with SMC.

Keywords: partially premixed flames; modelling; extended BML model; conditioned progress variable approach.

DOI: 10.1504/PCFD.2004.004090

Progress in Computational Fluid Dynamics, An International Journal, 2004 Vol.4 No.3/4/5, pp.229 - 236

Published online: 29 Mar 2004 *

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