Strained flamelets for turbulent premixed flames, I: Formulation and planar flame results

Journal Article · Sat May 15 00:00:00 EDT 2010 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2010.01.018· OSTI ID:21305713

Kolla, H; Swaminathan, N ^[1]

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1. Department of Engineering, Cambridge University, Cambridge CB2 1PZ (United Kingdom)

A strained flamelet model is proposed for turbulent premixed flames using scalar dissipation rate as a parameter. The scalar dissipation rate of reaction progress variable is a suitable quantity to describe the flamelet structure since it is governed by convection-diffusion-reaction balance and it is defined at every location in the flamelets, which are represented by laminar flames in reactant-to-product opposed flow configuration. The mean reaction rate is obtained by using the flamelets reaction rate and the joint pdf of the progress variable and its dissipation rate. The marginal pdf of the progress variable is presumed to be {beta}-pdf and the pdf of the conditional dissipation rate is taken to be log-normal. The conditional mean dissipation rate is obtained from modelled mean dissipation rate. This reaction rate closure is assessed using RANS calculations of statistically planar flames in the corrugated flamelets and thin reaction zones regimes. The flame speeds calculated using this closure are close to the experimental data of Abdel-Gayed et al. (1987) for flames in both the regimes. Comparisons with other reaction rate closures showed the benefits of the strained flamelets approach. (author)

• OSTI ID: 21305713
• Journal Information: Combustion and Flame, Vol. 157, Issue 5; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LAMINAR FLAMES
COMBUSTION KINETICS
FLAME PROPAGATION
PROBABILITY DENSITY FUNCTIONS
CONVECTION
SCALARS
COMPARATIVE EVALUATIONS
DIFFUSION
MATHEMATICAL MODELS
SIMULATION
VELOCITY
ZONES
TURBULENCE
Turbulent premixed flames
Flamelet modelling
Strained flamelets
Scalar dissipation rate