A NUMERICAL STUDY OF OPTIMUM NORMALIZED PREMIXING LENGTH FOR TURBULENT PARTIALLY PREMIXED FLAME IN A CONCENTRIC FLOW CONICAL NOZZLE BURNER

Abstract

The current work involves a numerical study to validate the numerical models to investigate the effects of the normalized premixing length (L/D) at a certain overall jet equivalence ratio (Ф) and a certain Reynolds number (Re) on the mixing field structure in a concentric flow burner. Also, involves finding the best normalized premixing length, L/D, in a concentric flow burner using validated numerical models. Finally, a numerical study of the partially premixed flame structure in a Concentric Flow Conical Nozzle (CFCN) burner by using numerical models, which included calculating the flame curvature and discussing the influence of equivalence ratio on the structure of the flame and finding the lowest value of the equivalence ratio at which the flame be sustainable. All numerical studies were carried out for air-natural gas mixture using ANSYS 2020 R2 Package.