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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

BURNING VELOCITIES OF PROPAGATING TURBULENT PREMIXED FLAMES

Samir N.D.H. Patel
Department of Aeronautical and Automotive Engineering Loughborough University Loughborough, LE11 3TU, UK

Salah S. Ibrahim
Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicester, LE11 3TU, UK

Abstract

The prediction of turbulent burning velocities of premixed flames is important for many sectors of industry, for example, in the automotive sector for optimizing spark-ignition engine design, and in the safe design of chemical processing plants against accedental explosions. Modelling turbulent premixed flames has received much attention over the last decade. However, such modelling attempts have generally proved to be limited to certain flow characteristics. This paper presents an assessment of two of the most commonly used premixed turbulent flame models, namely the mixing controlled Eddy Break Up (EBU) model and the Bray-Moss-Libby (BML) laminar flamelet model.
The experimental data due to Abdel-Gayed et al. (1987) are used for model validation. Previously, comparions of predictions with these numerous dimension-less experimental data have been obtained with a simple KPP analysis (Bray, 1990). In the present method, the predictions are obtained by solving transport equations for turbulent premixed flames propagating in one-dimensional spatial geometry.
Various forms of the BML laminar flamelet model based on most recent experimental reasoning are examined and validated. The results yield the typical characteristic of EBU models and show the sensitivity of the predicted turbulent burning velocities to various formulations of the BML laminar flamelet model.