Large-Eddy Simulation of Premixed Combustion in the Corrugated-Flamelet Regime. Issue 9 (1st September 2016)

• Record Type: Journal Article
• Authors: Langella, I.; Swaminathan, N.; Williams, F. A.; Furukawa, J.
• Is Part Of: Combustion science and technology. Volume 188:Issue 9(2016)
• Page Start: 1565
• Page End: 1591
• Publication Date: 2016-09-01
• Subjects: Flamelets -- Large eddy simulation (LES) -- Premixed combustion -- Subgrid scale (SGS) velocity; Combustion -- Periodicals; Combustion engineering -- Periodicals; 541.36105
• DOI: 10.1080/00102202.2016.1195824
• Languages: English
• ISSNs: 0010-2202

Abstract

ABSTRACT: 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, , 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 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 modeling 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 models required at the reaction rate closure level for practical LES of combustion in the corrugated-flamelet regime.