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Modeling of extinction in turbulent diffusion flames by the velocity-dissipation-composition PDF method

Identifieur interne : 001D10 ( Main/Exploration ); précédent : 001D09; suivant : 001D11

Modeling of extinction in turbulent diffusion flames by the velocity-dissipation-composition PDF method

Auteurs : A. T. Norris [États-Unis] ; S. B. Pope [États-Unis]

Source :

Combustion and Flame [ 0010-2180 ] ; 1995.

RBID : ISTEX:9E67464CB18E74479ECA5D64A927808B2650DE24

English descriptors

Teeft :
- Axial velocity, Chemical reaction, Combustion institute, Composition scatter plots, Conditional, Conditional averages, Cornell university, Differential diffusion, Dimensional grounds, Equal diffusivities, Equilibrium limits, Equilibrium line, Equilibrium values, Exit plane, Experimental data, Experimental error, Extinction, Extinction velocity, Flamelet regime, Fluid particles, Full chemical mechanism, Good results, Ildm, Ildm method, Initial conditions, Intrinsic manifold, Lean compositions, Local extinction, Maas, Mass flow rate, Mixture fraction, Nonhomogeneous flows, Norris, Numerical results, Pilot flame, Reaction rate, Reynolds number, Right column, Scalar, Scalar space, Scatter, Scatter plots, Small amount, Small scale diffusion process, Straight line, Sudden jumps, Transport equation, Turbulent, Turbulent diffusion flames.

Abstract

Abstract: The velocity-dissipation-composition probability density function (pdf) method is used to model a turbulent CO/H2N2—air-piloted jet diffusion flame in the regime of extinction. The thermochemistry is modeled by a three-scalar simplified formulation obtained by the intrinsic low-dimensional manifold (ILDM) method. Calculations are performed for five different jet velocities, and the scalar pdfs are compared with experimental data. Overall good agreement is obtained between the calculations and the experimental results, with the only significant difference being the high level of scatter in the experimental data compared with the pdf results: reasons for this difference are discussed. The pdf method is found to predict flame extinction at approximately the same jet velocity as that of the experiment. A small amount of local extinction is observed in the pdf results for the high-jet-velocity cases.

Url:

https://api.istex.fr/ark:/67375/6H6-BJNS7GF5-1/fulltext.pdf

DOI: 10.1016/0010-2180(94)00092-7

Affiliations:

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Le document en format XML

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<term>Conditional averages</term>
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<term>Differential diffusion</term>
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<term>Equal diffusivities</term>
<term>Equilibrium limits</term>
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<term>Extinction</term>
<term>Extinction velocity</term>
<term>Flamelet regime</term>
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<term>Full chemical mechanism</term>
<term>Good results</term>
<term>Ildm</term>
<term>Ildm method</term>
<term>Initial conditions</term>
<term>Intrinsic manifold</term>
<term>Lean compositions</term>
<term>Local extinction</term>
<term>Maas</term>
<term>Mass flow rate</term>
<term>Mixture fraction</term>
<term>Nonhomogeneous flows</term>
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<term>Numerical results</term>
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<term>Scalar</term>
<term>Scalar space</term>
<term>Scatter</term>
<term>Scatter plots</term>
<term>Small amount</term>
<term>Small scale diffusion process</term>
<term>Straight line</term>
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<front><div type="abstract" xml:lang="en">Abstract: The velocity-dissipation-composition probability density function (pdf) method is used to model a turbulent CO/H2N2—air-piloted jet diffusion flame in the regime of extinction. The thermochemistry is modeled by a three-scalar simplified formulation obtained by the intrinsic low-dimensional manifold (ILDM) method. Calculations are performed for five different jet velocities, and the scalar pdfs are compared with experimental data. Overall good agreement is obtained between the calculations and the experimental results, with the only significant difference being the high level of scatter in the experimental data compared with the pdf results: reasons for this difference are discussed. The pdf method is found to predict flame extinction at approximately the same jet velocity as that of the experiment. A small amount of local extinction is observed in the pdf results for the high-jet-velocity cases.</div>
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Modeling of extinction in turbulent diffusion flames by the velocity-dissipation-composition PDF method

Modeling of extinction in turbulent diffusion flames by the velocity-dissipation-composition PDF method

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri