LES of Premixed Combustion in the Corrugated-Flamelet Regime
Williams, F. A.
Combustion Science and Technology
Taylor & Francis
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Langella, I., Swaminathan, N., Williams, F. A., & Furukawa, J. (2016). LES of Premixed Combustion in the Corrugated-Flamelet Regime. Combustion Science and Technology, 188 (9), 1565-1591. https://doi.org/10.1080/00102202.2016.1195824
This is the final version of te article. It was first available from Taylor & Francis via https://doi.org/10.1080/00102202.2016.1195824
Large-eddy simulation (LES) is applied to a fuel-lean turbulent propane-air Bunsen flame in the corrugated-flamelet regime. The subgrid-scale (SGS) modeling includes a previously developed treatment of the total enthalpy along with three different SGS velocity, u'∆, models. In addressing the filtered reaction rate, a presumed probability density function (PDF) approach is employed for the reaction-progress variable, closed by a transport equation for its SGS variance. The statistics obtained using the three u'∆ models are in good agreement with the measurements and do not differ significantly from each other for first order moments suggesting that commonly used SGS modelling may be adequate to get the mean velocities and reaction progress variable. However, all three SGS velocity models fail to reflect a measured bimodality of the PDF of the radial component of the velocity in the central portion of the flame. This emphasizes a need for further development of u'∆ models, required at the reaction rate closure level, for practical LES of combustion in the corrugated-flamelet regime.
premixed combustion, flamelets, large eddy simulation (LES), subgrid scale (SGS) velocity
Engineering and Physical Sciences Research Council (Grant ID: EP/I027556/1)
Air Force Office of Scientific Research (Grant ID: FA9550-12-1-0138)
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External DOI: https://doi.org/10.1080/00102202.2016.1195824
This record's URL: https://www.repository.cam.ac.uk/handle/1810/256181
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/