Numerical modelling of swirling diffusive flames
1 University of Valladolid, Department of Energy and Fluid Mechanics, Valladolid, Spain
2 Tecnicas Reunidas, Thermo-Hydraulic Section, Madrid, Spain
3 Lund University, Energy Division, Lund, Sweden
4 Technical University of Lodz, Department of Heat Technology and Refrigeration, Lodz, Poland
a Corresponding author: firstname.lastname@example.org
Published online: 28 March 2016
Computational Fluid Dynamics has been used to study the mixing and combustion of two confined jets whose setup and operating conditions are those of the benchmark of Roback and Johnson. Numerical model solves 3D transient Navier Stokes for turbulent and reactive flows. Averaged velocity profiles using RNG swirl dominated k-epsilon model have been validated with experimental measurements from other sources for the non reactive case. The combustion model is Probability Density Function. Bearing in mind the annular jet has swirl number over 0.5, a vortex breakdown appears in the axis of the burner. Besides, the sudden expansion with a ratio of 2 in diameter between nozzle exits and the test chamber produces the boundary layer separation with the corresponding torus shape recirculation. Contrasting the mixing and combustion models, the last one produces the reduction of the vortex breakdown.
© Owned by the authors, published by EDP Sciences, 2016
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