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research-article

Development of a RANS premixed turbulent combustion model based on the algebraic flame surface density concept

[+] Author and Article Information
Usman Allauddin

Institut für Thermodynamik, Fakultät für Luft-und Raumfahrttechnik, Universität der Bundeswehr München, 85579 Neubiberg, Germany; Department of Mechanical Engineering, NED University of Engineering & Technology, Karachi, Pakistan
usman.allauddin@unibw.de

Michael Pfitzner

Institut für Thermodynamik, Fakultät für Luft-und Raumfahrttechnik, Universität der Bundeswehr München, 85579 Neubiberg, Germany
michael.pfitzner@unibw.de

1Corresponding author.

ASME doi:10.1115/1.4041308 History: Received April 27, 2018; Revised August 11, 2018

Abstract

Recently, a fractal-based algebraic flame surface density (FSD) premixed combustion model has been derived and validated in the context of Large Eddy Simulation (LES). The fractal parameters in the model, namely the cut-off scales and the fractal dimension were derived using theoretical models, experimental and Direct Numerical Simulation (DNS) databases. The model showed good performance in predicting the premixed turbulent flame propagation for low to high Reynold numbers (Re) in ambient as well as elevated pressure conditions. Several LES combustion models have a direct counterpart in the Reynolds-averaged Navier-Stokes (RANS) context. In the present work, a RANS version of the aforementioned LES subgrid scale FSD combustion model is developed. The performance of the RANS model is compared with that of the original LES model and validated with the experimental data. It is found that the RANS version of the model shows similarly good agreement with the experimental data.

Copyright (c) 2018 by ASME
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