Modeling of extinction in turbulent diffusion flames by the velocity-dissipation-composition PDF method
Identifieur interne : 001D84 ( Main/Merge ); précédent : 001D83; suivant : 001D85Modeling 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.
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:
DOI: 10.1016/0010-2180(94)00092-7
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<term>Conditional averages</term>
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<term>Dimensional grounds</term>
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<term>Equilibrium values</term>
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<term>Experimental data</term>
<term>Experimental error</term>
<term>Extinction</term>
<term>Extinction velocity</term>
<term>Flamelet regime</term>
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<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>
<term>Norris</term>
<term>Numerical results</term>
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<term>Small scale diffusion process</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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