Session: 04-04: Combustion Modeling I

Paper Number: 82122

82122 - Assessment of Thickened Flame Model Coupled With Flamelet Generated Manifold on a Low-Swirl Partially Premixed Gaseous Lifted Flame 

The present work focuses on the numerical modeling through Large Eddy Simulations (LES) of a low-swirl partially premixed lean flame operated with gaseous fuel. This burner is characterized by flame lift-off and the stabilization of the reaction zone at a remarkable distance from the nozzle outlet section. The main driver of this stabilization is the upstream transport of hot combustion products from the reaction zone to the flame base, where ignition of the fresh mixture is possible even at very lean equivalence ratios. The whole process presents a high degree of complexity and previous studies have shown that the reproduction of finite rate effects on combustion physics is crucial. To overcome these challenges, a hybrid Thickened Flame (TF) -Flamelet Generated Manifolds (FGM) model concept has been implemented in a general-purpose commercial CFD solver. The strategy consists of applying the artificial thickening to the scalar equations required for the query of the look-up table computed a priori. The final aim is to include a detailed chemistry description while maintaining a cost-effective approach and improving the reproduction of the turbulence-chemistry interaction. Results are validated with experimental data in terms of temperature and chemical species concentration maps, while a comparison with the other combustion modeling strategies performed by the authors highlights the advantage of this approach.

Presenting Author: Leonardo Langone University of Florence

Presenting Author Biography: Leonardo Langone is a Ph.D. student at the Department of Industrial Engineering at the University of Florence. He graduated in 2018 in mechanical engineering and his background includes CFD modeling of multiphase and reactive flows, mainly for gas turbine applications. Currently, his main research topic is the numerical modeling of spray lifted flames and he is involved in the CHAiRLIFT project under the supervision of Professor Antonio Andreini.

Authors:

Leonardo Langone University of Florence
Matteo Amerighi University of Florence
Lorenzo Mazzei University of Florence
Naseem Ansari ANSYS, Inc.
Rakesh Yadav ANSYS, Inc.
Stefano Orsino ANSYS, Inc.
Antonio Andreini University of Florence