Large-Eddy Simulation of a Jet-in-Hot-Coflow Burner Operating in the Oxygen-Diluted Combustion Regime

• Published in: Flow, turbulence and combustion Vol. 89; no. 3; pp. 449 - 464
• Main Authors: Ihme, Matthias, Zhang, Jian, He, Guowei, Dally, Bassam
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.09.2012; Springer
• Subjects: Applied sciences; Automotive Engineering; Energy; Energy. Thermal use of fuels; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fluid dynamics; Fluid- and Aerodynamics; Fundamental areas of phenomenology (including applications); Furnaces. Firing chambers. Burners; Gaseous fuel burners and combustion chambers; Heat and Mass Transfer; Physics; Turbulence simulation and modeling; Turbulent flows, convection, and heat transfer; Flamelet modeling; Three-stream combustion; MILD combustion; Turbulent non-premixed flames; Large-eddy simulation; Turbulent flame; Combustion; Modeling; Large eddy simulation; Diffusion flame; Vorticity; Flame structure; Numerical simulation; Turbulence structure; Gas burner
• ISSN: 1386-6184; 1573-1987
• DOI: 10.1007/s10494-012-9399-7

Large-eddy simulations of moderate and intense low-oxygen dilution (MILD) combustion of a jet-in-hot-coflow (JHC) burner are performed. This burner configuration consists of three streams, providing fuel, oxygen-diluted coflow, and air to the burner. To account for the mixing between the three reactant streams, a three-stream flamelet/progress variable (FPV) formulation is utilized. This model was previously applied to a condition corresponding to the upper range of MILD-combustion, and the objective of this contribution is to further investigate this model in application to highly diluted operating conditions. Comparisons of mean and conditional results show that the model accurately captures effects of increasing oxygen-depletion on the flame-structure and heat-release, and predictions for temperature and species mass fractions are in overall good agreement with experiments.