Impact of Turbulent Flow and Mean Mixture Fraction Results on Mixing Model Behavior in Transported Scalar PDF Simulations of Turbulent Non-premixed Bluff Body Flames |
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Authors: | Bart Merci Bertrand Naud Dirk Roekaerts |
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Institution: | (1) Department of Flow, Heat and Combustion Mechanics, Ghent University – UGent, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium;(2) Postdoctoral Fellow of the Fund of Scientific Research – Flanders (Belgium)(FWO-Vlaanderen), Brussels, Belgium;(3) CIEMAT, Madrid, Spain;(4) Department of Multi-scale Physics, Delft University of Technology, Delft, The Netherlands |
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Abstract: | Numerical simulation results are presented for three turbulent jet diffusion flames, stabilized behind a bluff body (Sydney
Flames HM1-3). Interaction between turbulence and combustion is modeled with the transported joint-scalar PDF approach. The
focus of the study is on the impact of the quality of simulation results in physical space on the behavior of two micro-mixing
models in composition space: the Euclidean Minimum Spanning Tree (‘EMST’) model and the modified Curl coalescence dispersion
(‘CD’) model. Profiles of conditional means and variances of thermo-chemical quantities, conditioned on the mixture fraction,
are discussed in the recirculation region and in the neck zone behind. The impact of the flow and mixing fields in physical
space on the mixing model behavior in composition space is strong for the CD model and increases as the turbulence – chemistry
interaction becomes stronger. The EMST conditional profiles, on the contrary, are hardly affected. |
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Keywords: | transported scalar PDF micro-mixing models turbulent non-premixed flames bluff body |
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