Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Comparison of the Gray-Gas and Weighted-Sum-of-Gray-Gases Models in a Non-Premixed Methane-air Flame Considering the Turbulence-Radiation Interaction
Submission Author:
Larissa Domingues Lemos , RS , Brazil
Co-Authors:
Larissa Domingues Lemos, Amanda Gonçalves de Figueiredo, Felipe Roman Centeno, Francis França
Presenter: Larissa Domingues Lemos
doi://10.26678/ABCM.ENCIT2018.CIT18-0040
Abstract
This study considers the influence of spectral modeling of radiative heat flux for the Gray-Gas (GG) and Weighted-Sum-of-Gray-Gases (WSGG) models on the solution of a turbulent flame considering the interaction between turbulence and radiation (TRI). The problem consists of a non-premixed turbulent methane flame surrounded by a low-velocity air coflow identified as Flame DLR-A. The model for chemical kinetics is the steady laminar diffusion flamelet (SLDF). To generate the flamelet library, turbulence-chemistry interaction is taken into account through previously assumed probability density functions (PDF) of mean scalars. The spatial integration of the radiative transfer equation is carried out with the discrete ordinates method. Turbulence is solved with k-ε Standard model, while the TRI methodology is based on temperature self-correlation. The solution is obtained using ANSYS/Fluent code coupled with user-defined functions (UDFs).
Keywords
Turbulence-radiation interaction, gray gas model, weighted-sum-of-gray-gases model, SLDF, Flame DLR-A, CFD
