On reduced mechanisms for methaneair combustion in nonpremixed flames

Bilger, R.W.; Starner, Sten; Kee, Robert J.

doi:10.1016/0010-2180(90)90122-8

Cited by 729 publications

(273 citation statements)

References 8 publications

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“…All flows were measured using mass flow controllers which were calibrated (within 1 % of reading) against laminar flow elements. The mixture fraction was calculated from the measured mass fractions using the Bilger formulation [21]. The measurement limits are discussed in Sections 4.5 and 4.6, in the context of the reported results.…”

Section: Methodsmentioning

confidence: 99%

On the structure of the near field of oxy-fuel jet flames using Raman/Rayleigh laser diagnostics

Sevault

Dunn

Ditaranto

2012

Combustion and Flame

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An experimental study on turbulent non-premixed jet flames is presented with focus on CO 2 -diluted oxy-fuel combustion using a coflow burner. Measurements of local temperatures and concentrations of the main species CO 2 , O 2 , CO, N 2 , CH 4 , H 2 O and H 2 were achieved using the simultaneous line-imaged Raman/Rayleigh laser diagnostics setup at Sandia National Laboratories. Two series of flames burning mixtures of methane and hydrogen were investigated. In the first series, the hydrogen molar fraction in the fuel was varied from 37 to 55 %, with a constant jet exit Reynolds number Re Fuel of 15,000. In the second series the jet exit Reynolds number was varied from 12,000 to 18,000, while keeping 55 % H 2 molar fraction in the fuel. Besides local temperatures and concentrations, the results revealed insights on the behaviour of localized extinction in the near-field. It was observed that the degree of extinction increased as the hydrogen content in fuel was decreased and as the jet Reynolds number was increased. Based on the distribution of the temperature, a fully burning probability index able to quantify the degree of extinction along the streamwise coordinate was defined and applied to the present flame measurements. A comparison of measured conditional mean of mass fractions and laminar flame calculations underlined the significant level of differential diffusion in the near-field that tended to decrease farther downstream. The results also showed high local CO levels induced by the high content of CO 2 in the oxidizer and flame products. A shift of maximum flame temperature was observed toward the rich side of the mixture fraction space, most likely as a consequence of reduced heat release in the presence of product dissociation. Main characteristics of laser Raman scattering measurements in CO 2 -diluted oxy-fuel conditions compared to air-diluted conditions are also highlighted. Most data, including scalar fluctuations and conditional statistics are available upon request.

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Section: Methodsmentioning

confidence: 99%

On the structure of the near field of oxy-fuel jet flames using Raman/Rayleigh laser diagnostics

Sevault

Dunn

Ditaranto

2012

Combustion and Flame

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“…We can indeed measure local values of Z(x, t) in our turbulent flow, using for instance Bilger's formula [41]:…”

Section: Modelling Assumption and 3d Parametrizationmentioning

confidence: 99%

RANS modelling of a lifted H2/N2 flame using an unsteady flamelet progress variable approach with presumed PDF

Naud

Novella

Pastor

et al. 2015

Combustion and Flame

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Elsevier Naud, B.; Novella Rosa, R.; Pastor Enguídanos, JM.; Winklinger, JF. (2015). RANS modelling of a lifted H2/N2 flame using an unsteady flamelet progress variable approach with presumed PDF. Combustion and Flame. 162 (4) AbstractAn unsteady flamelet / progress variable (UFPV) approach is used to model a lifted H 2 /N 2 flame in a RANS framework together with presumed PDF. We solve the unsteady flamelets both in physical space and in mixture fraction space. We show that in the former case, the scalar dissipation rate profile strongly varies in time (while it is assumed to be fixed in time in the latter). However, this does not result in significant qualitative differences in the corresponding flamelet libraries. The progress variable is carefully defined, including both the main combustion product (H 2 O) and a key radical species in ignition process (HO 2 ). The presumed-PDF model is proposed in terms of the non-normalised progress variable, without assuming its statistical independence with mixture fraction. We introduce a modelled transport equation for the mean progress variable which is consistent with the basic underlying UFPV assumption, derived from the Lagrangian flamelet model. The influence of different model parameters on the results for the mean temperature and mean species mass fractions and their fluctuations is discussed. Good results are obtained for the conditions of the considered lifted flame where detailed experimental data is available. However, at low coflow temperature the modelled flame lift-off height is shorter than expected.

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“…9, against the CFD model. To compare the numerical predictions with the measurements, mean scalar profiles are expressed as a function of mean mixture fraction, which is computed using Bilger's formula [29]. As already discussed and presented in Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Kinetic and fluid dynamics modeling of methane/hydrogen jet flames in diluted coflow

Frassoldati

Sharma

Cuoci

et al. 2010

Applied Thermal Engineering

126

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On reduced mechanisms for methaneair combustion in nonpremixed flames

Cited by 729 publications

References 8 publications

On the structure of the near field of oxy-fuel jet flames using Raman/Rayleigh laser diagnostics

On the structure of the near field of oxy-fuel jet flames using Raman/Rayleigh laser diagnostics

RANS modelling of a lifted H2/N2 flame using an unsteady flamelet progress variable approach with presumed PDF

Kinetic and fluid dynamics modeling of methane/hydrogen jet flames in diluted coflow

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