On soot and radiation modeling in buoyant turbulent diffusion flames

Snegirev, A. Yu.; Markus, Ekaterina; Kuznetsov, Egor; Harris, John B.; Wu, Tzong‐Yuan

doi:10.1007/s00231-017-2198-x

Cited by 41 publications

(11 citation statements)

References 41 publications

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“…An accurate way to model SFS emission TRI is to consider FDF approaches [171], [172], [173]. On the other hand, several studies relative to LES of fire related configurations have extended to LES the moment-based closure proposed by Snegirev for RANS [174], [175], [176]. The importance of SGS emission TRI is strongly dependent on the filter size.…”

Section: Tri In Lesmentioning

confidence: 99%

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

Liu

Consalvi

Coelho

et al. 2020

Fuel

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Radiative heat transfer (RHT) is often the dominant mode of heat transfer in flames, fires, and combustion systems and affects significantly temperature distributions directly and kinetically controlled chemical processes indirectly. Modeling RHT accurately in multidimensional flames and combustion systems is challenging mainly due to the highly spectral dependence of radiative properties of combustion products, the high computational cost of solving the radiative transfer equation (RTE), and the strong turbulence and radiation interactions (TRI). Significant progress has been made in all the three aspects in the last three decades and the state-of-the-art models and methods have been incorporated into CFD practice for modeling fires, turbulent jet flames, and turbulent combustion in combustion systems. In this article, we first discuss the coupling between RHT and combustion and the important role played by RHT in some fundamental flame phenomena. Then we discuss the state-of-the-art radiation models with a focus on RTE solvers, radiative property models and TRI. Next, we review the recent simulations of turbulent combustion systems involving these state-of-the-art radiation models. Finally, we provide concluding remarks and some potential research areas to advance RHT modeling in multiphase reacting flows. Nomenclature, , area normal to directions x, y and z [m 2 ] non-grey stretching factor for WSGG, SLW, and FSK methods absorption cross-section of a soot primary particle [m 2 ] absorption cross-section of a soot aggregate [m 2 ] diameter [m] , , integral over a control angle of the direction cosines relative to x, y and z-axis particle size parameter [-] radiant fraction [-] array of variables defining the absorption coefficient, = { , , , } Ω solid angle [sr] Subscript Fuel direction j spectral line S soot at a given wavenumber Superscript aggregate lth direction (DOM) or lth control angle (FVM) mth direction (DOM) or mth control angle (FVM) primary particle Operators 〈 〉 Reynolds averaged quantity ′ Reynolds fluctuating quantity ̅ filtered (or resolved) quantity ′′ subgrid-scale (or residual) fluctuation Recently, quasi-MC methods [43], [44] were employed to solve RHT problems in 3D participating media, aimed at the improvement of the convergence rate, and therefore the computational efficiency. In these methods, the random numbers are replaced by low-

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Section: Tri In Lesmentioning

confidence: 99%

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

Liu

Consalvi

Coelho

et al. 2020

Fuel

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“…Consequently, the development of LES-based fire simulators over the last 20 years raised naturally the issue of the radiation modelling for fire applications [4][5][6][7][8][9][10][11][12][13][14][15]. At the same time, the radiative heat transfer community reported significant progresses in the modelling of radiation in turbulent flames [16].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, less sophisticated radiation models were generally considered in most of the LES of fire plumes reported to date. These studies have mainly considered DOM and FVM as RTE solver [4][5][6][7][8][9][10][11][12][13][14]. Since the computational cost related to the solution of the RTE is relatively high, simplified radiative property models, assuming either an optically thin medium with the emission specified to reproduce the measured radiant fraction [4,5,10] or a grey medium [6-8, 11, 13], were generally retained.…”

Section: Introductionmentioning

confidence: 99%

“…Neglecting it affects significantly the predictions of the fire plume structure and radiative heat flux even for medium-scale pool fires. Several other works [8,11,14] have extended the moment-based closure, proposed by Snegirev for RANS [43], to model SGS emission TRI. This approach consists in approximating the filtered emission term by a Taylor series expansion and retaining only the lower-order moments.…”

Section: Introductionmentioning

confidence: 99%

“…This approach consists in approximating the filtered emission term by a Taylor series expansion and retaining only the lower-order moments. Nevertheless, moment-based methods introduce empirical adjustable coefficients that are generally tuned to match the experimental data [8,11,14]. Wu et al presented DNS of a 7.1 cm heptane pool fire using a very fine description of radiative heat transfer [15].…”

Section: Introductionmentioning

confidence: 99%

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Influence of gas radiative property models on Large Eddy Simulation of 1 m methanol pool fires

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The main objective of this work is to analyze the effects of gas radiative property models on the radiative outputs and flame structure in a 1 m diameter methanol pool fire. Large Eddy Simulation (LES) are run with the non-adiabatic steady laminar flamelet (SLF)/presumed filtered density function (FDF) model to close subgrid-scale (SGS) turbulence-chemistry and turbulence-radiation emission interactions. The radiative transfer equation (RTE) is solved using the Finite Volume Method (FVM) with different angular meshes, including uniform angular dicretizations comprising 16 (polar angle) × 24 (azimuthal angle) and 48 × 96 control angles and the FT n scheme with n up to 48. Four gas radiative property models, namely the Rank Correlated Full Spectrum k-distribution (RCFSK), the non-grey Weighted-Sum-of-Grey-Gases (WSGG), and two versions of the grey WSGG based on different evaluations of the mean path length are assessed. Model predictions with the RCFSK reproduce with fidelity the available experimental data in terms of

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Effects of the cone angle on the stability of turbulent nonpremixed flames downstream of a conical bluff body

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On soot and radiation modeling in buoyant turbulent diffusion flames

Cited by 41 publications

References 41 publications

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

Influence of gas radiative property models on Large Eddy Simulation of 1 m methanol pool fires

Effects of the cone angle on the stability of turbulent nonpremixed flames downstream of a conical bluff body

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