Assessment of radiative property models in non-gray sooting media

Demarco, R.; Consalvi, Jean-Louis; Fuentes, A.; Melis, S.

doi:10.1016/j.ijthermalsci.2011.03.026

Cited by 54 publications

(14 citation statements)

References 52 publications

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“…Previous numerical studies have demonstrated that the SNBCK model, in the absence of LBL solutions, is accurate enough to be used as the reference solution. It has been shown also that the 43 NB database provides solutions in close agreement with the 367 NB database (both from Soufiani and Taine) [22]. Local relative errors between the current model and the reference are estimated as…”

Section: Influence Of the Radiative Modelsmentioning

confidence: 73%

“…This coefficient is given by the following expression [23] , = 5.5 (3.83 14388 × 10 ⁄ ) (9) In this study only CO 2 and H 2 O are considered as the participating gases, neglecting the other combustion species. A previous study showed that neglecting the contribution of CO has only a minor influence on the divergence of the radiative flux [24].…”

Section: Radiation Modelsmentioning

confidence: 99%

“…One characteristic of this model is the need to define a reference state ( , , , ) to treat non-homogeneous non-isothermal conditions. A simple average over the flame volume is considered for the gas species and soot volume fraction, while an emission-weighted temperature is used as the reference temperature [22,24].…”

Section: Full Spectrum Correlated-k Model (Fsck)mentioning

confidence: 99%

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Influence of radiative property models on soot production in laminar coflow ethylene diffusion flames

Demarco

Consalvi

Fuentes

2012

J. Phys.: Conf. Ser.

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Abstract. Two axisymmetric laminar coflow non-smoking and smoking ethylene diffusion flames are studied numerically in order to assess the influence of different radiative property models on the soot formation and oxidation processes. Simulations are carried out by considering the Steady Laminar Flamelet (SLF) concept and a modified two-equation acetylene-based model to describe the soot nucleation, surface growth and oxidation processes. Several radiative property models are considered: the simple Optically Thin Approximation (OTA), the Weighted-Sum of Grey-Gases (WSGG), the Grey-Wide-Band model (GWB), the Statistical Narrow Band Correlated-k model (SNBCK) and the Full Spectrum Correlated-k model (FSCK). Comparisons between calculations carried out with the SNBCK model and experimental data show a reasonable agreement. Model results show that the choice of the radiative property models influence largely the soot prediction, especially in the upper part of the flame where oxidation occurs. Simulations show that the reabsorption of spectral gas and soot is an important feature and thus the commonly used OTA or grey models introduce large discrepancies. The GWB model leads to improved solutions, but it should be avoided if accurate predictions are desired. The FSCK provides equivalent results as compared to the SNBCK model with a substantial gain in CPU time.

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Section: Influence Of the Radiative Modelsmentioning

confidence: 73%

Section: Radiation Modelsmentioning

confidence: 99%

Section: Full Spectrum Correlated-k Model (Fsck)mentioning

confidence: 99%

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Influence of radiative property models on soot production in laminar coflow ethylene diffusion flames

Demarco

Consalvi

Fuentes

2012

J. Phys.: Conf. Ser.

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“…In practice, those coefficients are obtained from fitting total emittances computed from experimental-gas-data, such as those presented in Smith et al (1982) and Smith et al (1987). In a recent study, Demarco et al (2011) assessed several radiative models, such as the narrow band, wide band, GG and global models, such as the WSGG and spectral-line-based WSGG (SLW). According to the authors, the WSGG is very efficient from a computational point of view, and can yield accurate predictions, although significant discrepancies can appear in high soot loadings.…”

Section: Introductionmentioning

confidence: 99%

Um estudo numérico da influência da radiação sobre a turbulência em uma chama turbulenta 2D axissimétrica

Centeno

Santos

Silva³

et al. 2016

ete

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Abstract. This paper presents a study of the influence of thermal radiation on turbulence in the simulation of a turbulent, non-premixed methane-air flame. In such a problem, two aspects need to be considered for a precise evaluation of the thermal radiation: the turbulence-radiation interactions (TRI), and the radiative properties of the participating species, which are treated here with the weighted-sum-of-gray-gases (WSGG) model based on recently obtained correlations from HI-TEMP2010 database. The chemical reactions rates were considered as the minimum values between the Arrhenius and Eddy Break-Up rates. A twostep global reaction mechanism was employed, while the turbulence modeling was considered via Resumo. Este artigo apresenta um estudo da influência da radiação térmica sobre a turbulência através da simulação de uma chama turbulenta, não pré-misturada, de metano-ar. Neste problema dois aspectos precisam ser considerados para uma avaliação precisa da radiação térmica: interações turbulência-radiação (TRI) e as propriedades radiativas das espécies participantes, as quais são tratadas aqui com o modelo da soma ponderada de gases cinza (WSGG) baseado em correlações recentemente obtidas a partir do banco de dados espectrais HITEMP2010. As taxas das reações químicas foram consideradas como os menores valores entre as taxas de Arrhenius e de Eddy Break-Up. Um mecanismo de reação global de duas etapas foi empregado, enEste é um artigo de acesso aberto, licenciado por Creative Commons Atribuição 4.0 International (CC-BY 4.0), sendo permitidas reprodução, adaptação e distribuição desde que o autor e a fonte originais sejam creditados. 56

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“…The weighting coefficients account for the contribution of each gray gas, such as in [2,3]. In a recent study, Demarco et al [4] assessed several radiative models, such as the narrow band, wide band, GG and global models such as the WSGG and spectral-line-based WSGG (SLW). According to the authors, the WSGG is very efficient from a computational point of view, and can yield accurate predictions.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of the radiative transfer in a 2D axisymmetric turbulent non-premixed methane–air flame using up-to-date WSGG and gray-gas models

Centeno

Silva

Brittes

2015

J Braz. Soc. Mech. Sci. Eng.

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the computation of radiation with both the CR-WSGG and NCR-WSGG models provided better results than GG model, when compared with experimental data. For the combustion chamber and turbulence and combustion models employed in the present work, it was shown that the CR-WSGG is the recommended model, due to the acceptable agreement with experimental data and relatively low computational requirements in comparison to the NCR-WSGG model. The results show the importance of thermal radiation for an accurate prediction of the thermal behavior of a combustion chamber.

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Assessment of radiative property models in non-gray sooting media

Cited by 54 publications

References 52 publications

Influence of radiative property models on soot production in laminar coflow ethylene diffusion flames

Influence of radiative property models on soot production in laminar coflow ethylene diffusion flames

Um estudo numérico da influência da radiação sobre a turbulência em uma chama turbulenta 2D axissimétrica

Numerical simulations of the radiative transfer in a 2D axisymmetric turbulent non-premixed methane–air flame using up-to-date WSGG and gray-gas models

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