Extinction limits and associated uncertainties of nonpremixed counterflow flames of methane, ethylene, propylene and n-butane in air

Sarnacki, Brendyn; Esposito, G.; Krauss, Roland H.; Chelliah, Harsha K.

doi:10.1016/j.combustflame.2011.09.007

Cited by 57 publications

(45 citation statements)

References 28 publications

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“…The aim is to understand the characterization of the extinction limits of fuel-air mixtures from low extinction strain rate methane-air flames to high extinction strain rate ethylene-air flame. Sarnacki et al [4] reported an experimental and computational work, and they found that the variation of local extinction strain rate with changes in separation distance was within uncertainty of the experimental data. Zhen et al [5] investigated the thermal and heat transfer behaviors of multifuel jet inverse diffusion flame with induce swirl and non-swirling under identical air/fuel rates.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of an Impinging Diffusion Flames-Effects of Fuel Variability

Ghiti¹,

Bentebbiche²,

Hanchi³

2013

OJFD

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In our study, we investigate the differences between the combustion of different hydrocarbon fuels CH 4 , C 3 H 8 , C 4 H 10 . A numerical simulation of an impinging jet diffusion flames is used. The jet injector has a 10 mm in diameter and the distance between the jet flame and the vertical wall is 2 time half diameter. The fuel jet velocity was fixed for 11.8 m/s, corresponding to a Reynolds number of 6881. The flame characteristics varied from hydrocarbon to another for the same Reynolds number. The combustion products of CO, CO 2 , NO, OH, are depending on the methane and propane and butane flames for the same conditions. The temperature of the flame was varied from hydrocarbon to another the same as for the chemical species production rate. The concentration of the thermal and prompt NO pollutant depends on the temperature flow field and on the thermochemical characteristics of the hydrocarbon fuels.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of an Impinging Diffusion Flames-Effects of Fuel Variability

Ghiti¹,

Bentebbiche²,

Hanchi³

2013

OJFD

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“…A review of analytical, 17 numerical, [12][13][14]19 and experimental results 7,10,15 indicates that the flow field is controlled primarily by the separation ratio and, to a lesser extent, by the Reynolds number. The effect of the nozzle geometry is also apparent, whereby contoured nozzles, rather than straight ones, are adopted in order to inhibit the growth of the boundary layer on the interior walls.…”

Section: Introductionmentioning

confidence: 99%

“…A quantitative characterization of the velocity and mixing fields is recognized as an important prerequisite for the analysis of flames in counterflow burners. 8 Recently, there has been renewed interest in studying the details of the flow field in counterflow burners 7,[13][14][15] with the aim of reconciling the differences between the actual flow field and that assumed by reduced order models, [16][17][18] which are adopted to describe counterflow flames numerically and analytically.…”

Section: Introductionmentioning

confidence: 99%

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Reynolds number and geometry effects in laminar axisymmetric isothermal counterflows

Scribano

Bisetti

2016

Physics of Fluids

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The counterflow configuration is a canonical stagnation flow, featuring two opposed impinging round jets and a mixing layer across the stagnation plane. Although counterflows are used extensively in the study of reactive mixtures and other applications where mixing of two streams is required, quantitative data on the scaling properties of the flow field are lacking. The aim of this work is to characterize the velocity and mixing fields in isothermal counterflows over a wide range of conditions. The study features both experimental data from particle image velocimetry and results from detailed axisymmetric simulations. The scaling laws for the nondimensional velocity and mixture fraction are obtained as a function of an appropriate Reynolds number and the ratio of the separation distance of the nozzles to their diameter. In the range of flow configurations investigated, the nondimensional fields are found to depend primarily on the separation ratio and, to a lesser extent, the Reynolds number. The marked dependence of the velocity field with respect to the separation ratio is linked to a high pressure region at the stagnation point. On the other hand, Reynolds number effects highlight the role played by the wall boundary layer on the interior of the nozzles, which becomes less important as the separation ratio decreases. The normalized strain rate and scalar dissipation rate at the stagnation plane are found to attain limiting values only for high values of the Reynolds number. These asymptotic values depend markedly on the separation ratio and differ significantly from the values produced by analytical models. The scaling of the mixing field does not show a limiting behavior as the separation ratio decreases to the smallest practical value considered. Published by AIP Publishing. [http://dx

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“…Sarnaki et al [3] conducted an experimental and computational investigation to understand and quantify the source of uncertainties associated with such characterization of extinction limits of fuel-air mixtures, ranging from low extinction strain rate methane-air flames to high-extinction strain rate ethylene-air flames. Experiments were conducted at various nozzle separation distances to investigate potential differences in axial velocity profiles along the axial and radial directions and the corresponding local extinction strain rates.…”

Section: Introductionmentioning

confidence: 99%

The dilution effect on the extinction of wall diffusion flame

Ghiti¹

2014

Archives of Thermodynamics

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The dynamic process of the interaction between a turbulent jet diffusion methane flame and a lateral wall was experimentally studied. The evolution of the flame temperature field with the Nitrogen dilution of the methane jet flame was examined. The interaction between the diffusion flame and the lateral wall was investigated for different distance between the wall and the central axes of the jet flame. The dilution is found to play the central role in the flame extinction process. The flame response as the lateral wall approaches from infinity and the increasing of the dilution rate make the flame extinction more rapid than the flame without dilution, when the nitrogen dilution rate increase the flame temperature decrease.

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Extinction limits and associated uncertainties of nonpremixed counterflow flames of methane, ethylene, propylene and n-butane in air

Cited by 57 publications

References 28 publications

Numerical Investigation of an Impinging Diffusion Flames-Effects of Fuel Variability

Numerical Investigation of an Impinging Diffusion Flames-Effects of Fuel Variability

Reynolds number and geometry effects in laminar axisymmetric isothermal counterflows

The dilution effect on the extinction of wall diffusion flame

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