Comparative study of modeling a hydrogen nonpremixed turbulent flame

Obieglo, Andreas; Gass, J.; Poulikakos, Dimos

doi:10.1016/s0010-2180(00)00114-0

Cited by 38 publications

(25 citation statements)

References 13 publications

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“…The experimental data demonstrate that differential diffusion is important only at the first location (x/Lvis = 1/8) [5,7].…”

Section: Resultsmentioning

confidence: 83%

“…The effect of preferential diffusion, which characterizes the turbulent hydrogen flames, is present in the regions near the jet nozzle exit as indicated by Meier [30] and Sanders [31]. The effect of non-equilibrium chemistry also plays an important role in these regions, Obieglo [32]. (iii) Finally, we can say that the difference between numerical results and experimental data is due first to the effect of preferential diffusion and non-equilibrium chemistry characterizing the hydrogen flames.…”

Section: Discussionmentioning

confidence: 89%

“…Moreover, all results are found to be insensitive to the kinetic scheme employed. Obieglo et al [7] applies the (k-ε) model of turbulence with pope correction to this flame. Three combustion models are compared.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transported-PDF (IEM, EMST) micromixing models in a hydrogen-air nonpremixed turbulent flame

Senouci¹,

Bounif²,

Abidat³

et al. 2013

Acta Mech

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The topic of this study is the numerical simulation of a turbulent non-premixed hydrogen flame with different micromixing models in order to investigate their predictive capability. The two micromixing models are compared. Comparisons with experimental data demonstrate that predictions based on the EMST model are slightly better. The EMST improves largely the precision of the results to the detriment of the RAM and the CPU performances. Overall, profile predictions of mixture fraction, flame temperature and major species are in reasonable agreement with experimental data.

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“…The experimental data demonstrate that differential diffusion is important only at the first location (x/Lvis = 1/8) [5,7].…”

Section: Resultsmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 89%

See 1 more Smart Citation

Transported-PDF (IEM, EMST) micromixing models in a hydrogen-air nonpremixed turbulent flame

Senouci¹,

Bounif²,

Abidat³

et al. 2013

Acta Mech

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“…Barlow and al [5]. The experimental data demonstrate that differential diffusion is important only at the first location (x/Lvis=1/8) [18], [19]. The hydrogen air flame studied here is not influenced by buoyancy because of the high values of the Froude number [20], which are about 17,000.…”

Section: Resultsmentioning

confidence: 89%

“…The effect of preferential diffusion, which characterizes the turbulent hydrogen flames, is present in the regions near the jet nozzle exit as indicated by W. Meier [21] and H. Sanders [22]. The effect of non-equilibrium chemistry also plays an important role in these regions, A. Obieglo [19].…”

Section: Discussionmentioning

confidence: 97%

Untitled

2016

IJHT

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In this present study, the numerical simulations are performed for an axisymmetric turbulent jet diffusion hydrogen/air flame, by using a hybrid Finite-Volume/Composition PDF-Transport method. This method represents a rational approach for the study of turbulent reacting flows containing signficant turbulencechemistry interactions. The major attraction of Composition PDF method is that the terms associated with chemical reaction appear in closed form, leaving only molecular mixing and turbulent transport terms to be modeled. The accuracy of Composition PDF model calculations depends on the accurate representation of the chemistry and on the mixing model including the value of the mixing-model constant CΦ (mixing-model constant CΦ is the mechanical to scalar time scale ratio (CΦ =τt/τΦ).There has been considerable development in the past three decades in PDF methods, and reviews can be found in Dopazo and O'Brien

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Hydrogen as burner fuel: modelling of hydrogen-hydrocarbon composite fuel combustion and NOx formation in a small burner

İlbaş

Yılmaz

Везироглу

et al. 2005

Int. J. Energy Res.

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SUMMARYThe objective of this work is to investigate numerically the turbulent non-premixed hydrogen (H 2 ) and hydrogen-hydrocarbon flames in a small burner. Numerical studies using Fluent code were carried out for air-staged and non-staged cases. The effects of fuel composition from pure hydrogen to natural gas (100%H 2 , 70%H 2 +30%CH 4 , 10%H 2 +90%CH 4 , and 100%CH 4 ) were also investigated. The predictions are validated and compared against the experimental results previously obtained and results from the literature. Turbulent diffusion flames are investigated numerically using a finite volume method for the solution of the conservation equations and reaction equations governing the problem. Although, three different turbulence models were tested, the standard k-e model was used for the modelling of the turbulence phenomena in the burner. The temperature and major pollutant concentrations (CO and NO x ) distributions are in good agreement with the existing experimental results. Air staging causes rich and lean combustion regions thus lower NO x emissions through the combustor exit. Blending hydrogen with methane causes considerable reduction in temperature levels and thus NO emissions. Increasing the mixture ratio from stoichiometric to leaner mixtures also decreases the temperature and thus NO emissions. Hydrogen may be considered a good alternative fuel for burners, as its use reduces the emission of pollutants, and as it is a renewable synthetic fuel.

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Comparative study of modeling a hydrogen nonpremixed turbulent flame

Cited by 38 publications

References 13 publications

Transported-PDF (IEM, EMST) micromixing models in a hydrogen-air nonpremixed turbulent flame

Transported-PDF (IEM, EMST) micromixing models in a hydrogen-air nonpremixed turbulent flame

Untitled

Hydrogen as burner fuel: modelling of hydrogen-hydrocarbon composite fuel combustion and NOx formation in a small burner

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