Analysis of a gaseous partially premixed lifted flame in swirling flow through different LES combustion models

The present study numerically investigates a low-swirl partially premixed lifted flame employing gaseous fuel through CFD calculations in Large Eddy Simulations (LES) context. Lifted flames have been studied in many different configurations during the last decades since their potential in terms of pollutant emissions and stability. Nevertheless, the stabilization mechanism behind this type of flame is still not completely understood. Two different combustion modeling strategies are adopted: the Flamelet Generated Manifold (FGM) approach and the Artificially Thickened Flame (ATF) model. Moreover, an extended version of the FGM model including stretch and heat loss effects is applied. Numerical results are compared with the available experimental data in terms of temperature and carbon monoxide concentration maps showing that the ATF model has a substantial advantage on the FGM concerning the description of the physics involved