THERMAL SCIENCE

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Miroslav Sijerčić

,

Žarko Stevanović

EDDY-VISCOSITY AND SECOND-MOMENT MODELS OF FREE PREMIXED FLAME

ABSTRACT
This paper deals with the comparison of the eddy-viscosity and second-moment approaches for turbulence modelling of premixed jet flames. In order to predict the specific features of axisymetrical reacting free jets, the modified Cd coefficient in k-e turbulence model is proposed. Special attention is paid to the second-moment model (Reynolds-Stress Turbulence Model) concerning the prediction of anisotropy level and correlation coefficients of turbulent diffusion of scalar components. The models are used for prediction of premixed turbulent acetylene flame. Calculation results are compared with the experimental data. The qualitative and quantitative comparison between two approaches is presented. The results of these computations demonstrate the superiority of the second-moment turbulence model over eddy-viscosity one. Also, the further improvements of both turbulence models are discussed in order to overcome the discrepancy found between experimental and numerical data.
PAPER SUBMITTED: 1997-12-18
PAPER REVISED: 1998-04-29
PAPER ACCEPTED: 1998-09-10
PUBLISHED ONLINE: 2020-09-20
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 1998, VOLUME 2, ISSUE Issue 1, PAGES [13 - 31]
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EDDY-VISCOSITY AND SECOND-MOMENT MODELS OF FREE PREMIXED FLAME

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence