Numerical study on the importance of the turbulent inlet boundary condition and differential diffusion in a turbulent H₂/N₂/air jet diffusion flame

ABSTRACT

This work concerns numerical simulations of the turbulent H₂/N₂/air jet diffusion flame (Meier et al., 1996a), using large eddy simulations with conditional moment closure as the combustion model. The study focuses on the impact of the Random Spots method (Kornev and Hassel, 2007), adopted to describe the turbulence at the inlet, on the flow field. Furthermore, the region where the contribution of differential molecular diffusion is relevant is determined through the analysis of the scalar dissipation rate. The numerical results are discussed through the analysis of Favre-averaged profiles of velocity, mixture fraction temperature and species along the centerline and at three axial locations.

KEYWORDS:

• CFD
• LES
• CMC
• Hydrogen flame
• OpenFOAM
• H3
• Random spots
• Turbulent inflow generator

Acknowledgments

The authors strongly acknowledge Prof. Mastorakos (The University of Cambridge) and Dr. Garmory (Loughborough University) for providing the in-house CMC code used in this study.

Additional information

Funding

This research has been funded by Ghent University (Belgium) through GOA project; [BOF16/GOA/004] (PREdiction of Turbulent REactive Flows – http://www.pretref.ugent.be/).