A three-equation model for the prediction of soot emissions in LES of gas turbines

Benedetta Franzelli (1) , A. Vié (1) , N. Darabiha (1)

1 EM2C - Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion

The design of new low-emission systems requires the development of models providing an accurate prediction of soot production for a small computational cost. In this work, a three-equation model is developed based on mono-disperse closure of the source terms from a sectional method. In addition, a post-processing technique to estimate the particles size distribution (PSD) from global quantities is proposed by combining Pareto and log-normal distributions. After validation, the developed strategy is used to perform a large eddy simulation of soot production in a model combustor representative of gas turbine combustion chambers. It is shown that the three-equation model is able to provide a good estimation of soot volume fraction and information on PSD in complex geometries for a low computational time.

Mots clés: Soot modelling; three-equation model; Particle Size Distribution; Gas turbine

Domaines: Milieux fluides et réactifs

Benedetta Franzelli, A. Vié, N. Darabiha. A three-equation model for the prediction of soot emissions in LES of gas turbines. Proceedings of the Combustion Institute, 2018, ⟨10.1016/j.proci.2018.05.061⟩. ⟨hal-01856557⟩