Experimental and computational study of C2H2 and CO in a laminar axisymmetric methane–air diffusion flame

Mokhov, Anatoli; Bennett, Beth Anne V.; Levinsky, Howard; Smooke, Mitchell D.

doi:10.1016/j.proci.2006.08.094

Cited by 12 publications

(10 citation statements)

References 30 publications

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“…The adiabatic stoichiometric temperature of the H₂/N₂ mixture is ≈2040 K. The characteristic 'wishbone' flame structure [12][13][14][15][16][17] is obtained and the flame reaches its maximum temperature very close to the inlet, at the edges of the jet if differential diffusion effects are taken into account. Without differential diffusion effects, however, the maximum flame temperature, corresponds to the adiabatic flame temperature of the mixture, and is found on the centerline at a location about 10D downstream.…”

Section: Resultsmentioning

confidence: 99%

A new methodology to incorporate differential diffusion in CFD simulations of reactive flows

Maragkos

Rauwoens

Merci

2013

Combustion and Flame

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A new methodology to take into account differential diffusion in numerical simulations of reactive flows is presented. Within this new method, the diffusion term in the transport equations of the conserved scalars consists of two parts, one expressing the diffusion between the conserved scalars and one expressing the feedback from the combustion model. The second term, which is often neglected, has been shown to have a substantial influence in the flow field. In addition, there is a reduction of the number of transport equations to be solved from the number of species (minus one) to the number of elements (minus one), and the chemical source term in the transport equations is absent. We apply the new method to a laminar, axi-symmetric H₂/N₂ -air diffusion flame and compare the calculations with experimental data. When differential diffusion effects are properly taken into account in the transport equations in physical space, simulation results agree well with the experimental data. Ignoring differential diffusion effects is not acceptable, due to lack of H₂ diffusion close to the jet inlet.

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Section: Resultsmentioning

confidence: 99%

A new methodology to incorporate differential diffusion in CFD simulations of reactive flows

Maragkos

Rauwoens

Merci

2013

Combustion and Flame

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“…In order to reduce these uncertainties, acetylene (C 2 H 2 ) was determined to be one viable candidate for additional measurement [6]. Measured acetylene concentrations also would be beneficial to investigate additional chemistry, such as the formation of polycyclic aromatic hydrocarbons and soot in turbulent flames, as done previously in laminar flames [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Quantitative acetylene measurements in laminar and turbulent flames using 1D Raman/Rayleigh scattering

Fuest

Magnotti

Dreizler

et al. 2015

Combustion and Flame

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“…In order to reduce these uncertainties, acetylene (C 2 H 2 ) was found as one potential candidate [6]. Measured acetylene concentrations also would be beneficial to investigate additional chemistry such as the formation of polycyclic aromatic hydrocarbons and soot in turbulent flames, as done previously in laminar flames [11][12][13][14][15]. To date, all previous studies have presented time and/or space averaged results in order to allow for reasonable signal-to-noise ratios.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, no instantaneous and spatially-resolved measurements in turbulent flames have been reported. As one example of previously-reported results, Mokhov et al [13,14] applied spontaneous Raman scattering to detect acetylene in a laminar methane/air flame. For those point measurements they used a 1 kHz laser, 25 s exposure time and 20 image-accumulation yielding and a reported signal-to-noise ratio of 5.…”

Section: Introductionmentioning

confidence: 99%

Towards quantitative concentration measurement of acetylene in rich hydrocarbon flames using 1D Raman/Rayleigh scattering

Fuest

Dreizler

Sutton

2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This work presents the extension of the established detection of seven major species in 1D Raman/Rayleigh measurements to incorporate acetylene as an eighth species. Acetylene is an important soot precursor which is generated in hydrocarbon flames as an intermediate species following decomposition. It occurs over a broad temperature range in the flame and has been identified as a potentially detectable species in 1D Raman/Rayleigh measurements. In this paper, we discuss the Raman spectral signature of acetylene, its temperature-dependence, calibration points, and the interference with other Raman-active species, C2 and broadband interferences, all of which are essential to quantify for accurate data processing. In this regard, Raman measurements in laminar and turbulent flames of dimethyl ether were aquired. The data was spectrally analyzed, and, in conjunction with laminar flame calculations, the necessary calibration points were derived to place the acetylene signals on an absolute scale. Finally, detection limits of acetylene, signal-to-noise, and signal-to-interference ratios in laminar and turbulent flames are discussed.

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Experimental and computational study of C2H2 and CO in a laminar axisymmetric methane–air diffusion flame

Cited by 12 publications

References 30 publications

A new methodology to incorporate differential diffusion in CFD simulations of reactive flows

A new methodology to incorporate differential diffusion in CFD simulations of reactive flows

Quantitative acetylene measurements in laminar and turbulent flames using 1D Raman/Rayleigh scattering

Towards quantitative concentration measurement of acetylene in rich hydrocarbon flames using 1D Raman/Rayleigh scattering

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