A numerical investigation of the Eulerian PDF transport approach for modeling of turbulent non-premixed pilot stabilized flames

Yadav, Rakesh; Kushari, Abhijit; Eswaran, V.; Verma, Atul Kumar

doi:10.1016/j.combustflame.2012.11.010

Cited by 25 publications

(20 citation statements)

References 45 publications

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“…Rakesh et al [38] using joint composition PDF and Habibi et al [43] using flamelet model, investigated the effect of radiation for this flame. They have observed that with the inclusion of radiative heat transfer the temperature reduced by $100 K at downstream positions as $250 mm.…”

Section: Inclusion Of Radiative Heat Transfermentioning

confidence: 99%

“…The increase in diffusion due to over predicted mean temperature results in the under-estimation of velocity along the downstream positions. The under prediction in the downstream [38], mainly due to the difference in pilot modeling approach and joint composed PDF model was used as opposed to steady flamelet in the present study. A similar comment can be made on the RMS and turbulent kinetic energy predictions.…”

Section: Velocitymentioning

confidence: 99%

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Effect of precursors and radiation on soot formation in turbulent diffusion flame

Reddy

Yadav³

2015

Fuel

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a b s t r a c tSoot formation in 'Delft Flame III', a pilot stabilized turbulent diffusion flame burning natural gas/air, is investigated using ANSYS FLUENT by considering two different approaches for soot inception. In the first approach soot inception is based on the formation rate of acetylene, while the second approach considers the formation rate of two and three-ringed aromatics to describe the soot inception (Hall et al., 1997). Transport equations are solved for soot mass fraction and radical nuclei concentration to describe inception, coagulation, surface growth, and oxidation processes. The turbulent-chemistry interactions and soot precursors are described by the steady laminar flamelet model (SLFM). Two chemical mechanisms GRI 3.0 (Gregory et al.) and POLIMI (Ranzi et al., 2012) are used to represent the effect of species concentration on soot formation. The radiative properties of the medium are included based on the nongray modeling approach by considering four factious gases; the weighted sum of gray gas (WSGGM) approach is used to model the absorption coefficient. The effect of soot on radiative transfer is modeled in terms of effective absorption coefficient of the medium. A beta probability density function (b-PDF) in terms of normalized temperature is used to describe the effect of turbulence on soot formation. The results clearly elucidate the strong effect of radiation and species concentration on soot volume fraction predictions. Due to increase in radiative heat loss with soot, flame temperature decreases slightly. The inclusion of ethylene has less synergic effect than that of both benzene and ethylene. Both cases have less impact on the nucleation of soot. The increase in soot volume fraction with soot-turbulence interaction is in consistence with the DNS predictions.

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Section: Inclusion Of Radiative Heat Transfermentioning

confidence: 99%

Section: Velocitymentioning

confidence: 99%

Effect of precursors and radiation on soot formation in turbulent diffusion flame

Reddy

Yadav³

2015

Fuel

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“…Crnomarkovic et al [9] compared the numerical results obtained when the GG and the WSGG models were applied to model the radiative properties of the gas phase inside a lignite fired furnace. In Yadav et al [10], the combustion processes of turbulent non-premixed pilot stabilized flames were studied including radiative heat transfer by means of the WSGG model. In Silva et al [11], the authors applied the GG model to study the combustion of coal in a commercial thermal power plant to simulate the operational conditions and identify the factors of inefficiency.…”

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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“…The composition space is defined by a smaller number of interactive environments by the coexisting in physical space [20].…”

Section: The Multi Environment Eulerian Pdf Transports (Mepdf) Methodsmentioning

confidence: 99%

“…The second one to solve this issue is the eulerian PDF method, some researchers has studied and proposed various ideas in the literature to explain the presumed shape multienvironment eulerian method (MEPDF) in turbulent reaction flow [17][18][19][20][21][22]. Tang et al studied the numerical investigation with direct quadrature method of moments (DQMOM) for tested the finite-rate chemistry by modeling a series of bluffbody stabilized flames and showed that the MEPDF model accurately take the trends exhibited among these flames [18].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

IJHT

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Transported probability density function (PDF) approach have been applied broadly and effectively for modelling turbulent reacting flows. The discretization of this approach is done with two methods, Multi-Environment Eulerian (MEPDF) and Lagrangian MonteCarlo (LPDF) which each method has advantages and disadvantages. The aim of this work is to investigate the capabilities of each method in predicting hydrogen combustion in a turbulent flame. A comparative study has been adopted between the two methodsby equivalent physical models and numerical parameters. The study was applied in the diffusion turbulent flame of hydrogen into a vitiated of hot coflow with modified K-epsilon model of turbulence. The chosen mixture model is the IEM (Interaction by Exchange with the Mean) with mixing constant (2.1). The number of environment in the first approach is (2.0). The model was solved in this work by the commercial CFD code, ANSYS fluent and the chemical reaction mechanism injected is GRI mech 2.1. The numerical results for temperature and species mass fractions are presented and compared with the experimental data. The comparison shows that the eulerian method gives better predictions than the lagrangian method. The advantages and disadvantages of both models are discussed in detail in relationship to the results.

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A numerical investigation of the Eulerian PDF transport approach for modeling of turbulent non-premixed pilot stabilized flames

Cited by 25 publications

References 45 publications

Effect of precursors and radiation on soot formation in turbulent diffusion flame

Effect of precursors and radiation on soot formation in turbulent diffusion flame

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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