Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Numerical CFD evaluation of a flameless burner using detailed chemical kinetics
Submission Author:
Fagner Luis Goulart Dias , MG
Co-Authors:
Marco Antonio Nascimento, Lucilene Oliveria Rodrigues, Fagner Luis Goulart Dias
Presenter: Fagner Luis Goulart Dias
doi://10.26678/ABCM.COBEM2017.COB17-1976
Abstract
Flameless combustion regime has been shown to be promising because of the high combustion efficiency coupled with low levels of pollutant emissions, especially nitrogen oxides, NOx. Over the last few years, numerous studies have investigated the main features of the flameless combustion regime and also seeking to obtain their numerical modeling. Among the numerical models the most widely used in the turbulence modeling is the k-ε realizable (KER), the Eddy Dissipation Concept (EDC) for combustion and the Discrete Ordinates (DO) for radiation modeling, as well as use of detailed reaction mechanisms. Based on experimental data, those models that would be more suitable for numerical prediction of this regime, as well as the needs of adjustments were investigated. Therefore, this work aims to present a numerical investigation using ANSYS Fluent about the burning process, through detailed chemical kinetics using the CHEMKIN package. Initial results with global reaction mechanism showed elevated temperatures, especially close to the burner injector, which reflected negatively on the NOx content at radial planes plotted. In the case of GRIMech3.0 detailed reactions, the temperatures remained moderate, but with a CO and NOx levels above the experimental data, beyond the large computational time used. New investigations will be needed to better represent the burning process, especially in the content of the pollutants formed.
Keywords
Numerical Modeling, flameless, CFD analysis, mild combustion
