Hydrogen–hydrocarbon turbulent non-premixed flame structure

In this study, the structure of turbulent non-premixed CH 4-H 2/air flames is analyzed with a special emphasis on mixing and air entrainment. The amount of H 2 in the fuel mixture varies under constant volumetric fuel flow. Mixing is described by mixture fraction and its variance while air entrainme...

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Bibliographic Details
Published inInternational journal of hydrogen energy Vol. 34; no. 11; pp. 5040 - 5047
Main Authors Tabet, F., Sarh, B., Gökalp, I.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Kidlington Elsevier Ltd 01.06.2009
Elsevier
Subjects
Air entrainment
Applied sciences
Combustion of gaseous fuels
Combustion. Flame
Computational fluid dynamics
Energy
Energy. Thermal use of fuels
Entrainment
Exact sciences and technology
Flamelet approach
Fluid flow
Fuel blend
Fuels
Mass flow
Non-premixed flame
Theoretical studies. Data and constants. Metering
Turbulence
Turbulent flow
Turbulent mixing
Variance
Air entrainment
Fuel blend
Flamelet approach
Turbulent mixing
Non-premixed flame
Turbulent flame
Methane
Nitrogen oxide
Computational fluid dynamics
Hydrogen
Modeling
Diffusion flame
Flame structure
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Summary:In this study, the structure of turbulent non-premixed CH 4-H 2/air flames is analyzed with a special emphasis on mixing and air entrainment. The amount of H 2 in the fuel mixture varies under constant volumetric fuel flow. Mixing is described by mixture fraction and its variance while air entrainment is characterized by the ratio of gas mass flow to fuel mass flow at the inlet section. The flow field and the chemistry are coupled by the flamelet assumption. Mixture fraction and its variance are transported by the computational fluid dynamics (CFD) code. The slow chemistry aspect of NO x is handled by solving an additional transport equation with a source term derived from flamelet library. The results obtained show an improvement of mixing with hydrogen addition leading to a strong consumption of CH 4 and a high air entrainment into the centerline region. As a global effect of this, the composite fuels burn faster and thereby reduce the residence time which ultimately shortens the flame length and thickness. On the other hand, hydrogen is found to increase NO x level.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2008.12.083