Simulation of spherically expanding turbulent premixed flames
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Publication Date
2013-10-03Journal Title
Combustion Science and Technology
Conference Name
5th European Combustion Meeting
ISSN
0010-2202
Publisher
Informa UK Limited
Volume
185
Pages
1509-1540
Language
English
Type
Conference Object
Metadata
Show full item recordCitation
Ahmed, I., & Swaminathan, S. (2013). Simulation of spherically expanding turbulent premixed flames. Combustion Science and Technology, 185 1509-1540. https://doi.org/10.1080/00102202.2013.808629
Abstract
Statistically spherical expanding turbulent premixed flames are computed using unsteady
Reynolds-Averaged Navier-Stokes (URANS) approach. Mean reaction rate is
closed using strained and unstrained flamelet models and an algebraic model. The
flamelets are parametrised using the scalar dissipation rate in the strained flamelet
model. It is shown that this model is able to capture the measured growth rate of
methane-air turbulent flame ball, which is free of thermo-diffusive instability. The
spherical flames are observed to accelerate continuously. The flame brush thickness
grows in time and the role of turbulent diffusion on this growth seems secondary compared
to the convection due to the fluid velocity induced by the chemical reaction.
The spherical flames have larger turbulent flame speed, the leading edge displacement
speed st, compared to the planar flames for a given turbulence and thermo-chemical
condition. The computational results suggest st/s0
L " Rent
with 0.57 # n # 0.58, where
Ret is the turbulence Reynolds number and s0
L is the unstrained planar laminar flame
speed, for both spherical and planar flames.
Keywords
Turbulent Premixed Flames, Spherical Flames, Scalar Dissipation Rate, Turbulent Flame Speed
Identifiers
External DOI: https://doi.org/10.1080/00102202.2013.808629
This record's URL: https://www.repository.cam.ac.uk/handle/1810/246747
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