Eventos Anais de eventos
EPTT 2024
14th Spring School on Transition and Turbulence
Turbulence Modeling in Nonpremixed Sooting Flames: Entrainment Effects and Implications
Submission Author:
Fabio Henrique Bastiani , SP , Brazil
Co-Authors:
Fabio Henrique Bastiani, Pedro Bianchi Neto, Dirceu Noriler
Presenter: Fabio Henrique Bastiani
doi://10.26678/ABCM.EPTT2024.EPT24-0014
Abstract
Turbulence modeling is a crucial area in fluid dynamics and combustion engineering, where the interplay between turbulent flows and chemical reactions dictates the efficiency and emissions of combustion systems. Accurate predictions of these processes are essential for developing cleaner and more efficient combustion technologies. Turbulence is a complex phenomena that presents a significant challenges to fully resolve, necessitating the development of robust modeling techniques or effective approximations. This paper investigates the impact of different turbulence models on temperature and soot volume fraction predictions in non-premixed ethylene-air flames. The $k-\varepsilon$ standard, $k-\varepsilon$ realizable, and $k-\omega$ Shear-Stress Transport (SST) models are employed to close the RANS equations. Analyses in cold gas simulations reveal that entrainment may be overpredicted by the standard $k-\varepsilon$ and $k-\omega$ SST models. Results indicate that the choice of turbulence model significantly affects flame structure and soot formation, with the $k-\varepsilon$ realizable model providing accurate predictions of flame temperature and soot volume fraction in agreement with experimental data. This study contributes to the ongoing effort to enhance cost-effective turbulence modeling, offering insights into model strengths and limitations in non-premixed turbulent flames.
Keywords
turbulence modeling, non-premixed flames, Soot formation, entrainment, Simulation
