Application of spontaneous Raman and Rayleigh scattering and 2D LIF for the characterization of a turbulent CH 4 /H 2 /N 2 jet diffusion flame

Bergmann, V.; Meier, Wolfgang; Wolff, Dagmar; Stricker, W.

doi:10.1007/s003400050424

Cited by 189 publications

(91 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, the effects of differential diffusion are expected to be more significant closer to the nozzle, as reported from different flames burning hydrogen [30,31]; whereas equal diffusivities transport model would rather match far downstream zones where the upstream effects of differential diffusion have been washed out through a process of re-entrainment and turbulent mixing over the development length of the jet [29]. Figure 7 shows the scatter plots of CO, O 2 , H 2 , H 2 O, CO 2 and CH 4 mass fractions compared to the laminar flame calculations.…”

Section: Influence Of Differential Diffusionmentioning

confidence: 77%

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

Sevault

Dunn

Ditaranto

2012

Combustion and Flame

View full text Add to dashboard Cite

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.

show abstract

Section: Influence Of Differential Diffusionmentioning

confidence: 77%

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

Sevault

Dunn

Ditaranto

2012

Combustion and Flame

View full text Add to dashboard Cite

show abstract

“…The measurement principles used in this experiment have been described elsewhere for Rayleigh [15][16][17] and OH-PLIF [18,19]. Simultaneous diagnostics were applied to both flame types.…”

Section: Simultaneous Rayleigh / Oh-plif Measurementsmentioning

confidence: 99%

Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals

Hunger

Zulkifli

Williams

et al. 2017

Proceedings of the Combustion Institute

View full text Add to dashboard Cite

show abstract

“…52 Here it is selected manually so that the decay of Y * 2 I matches the DNS data while the decay of Y * 2 I I is modeled implicitly through the side stepping process with r s given by Eq. (36). The value of α is not critical and any value (or even random values 4 ) between 0 and 1 can be used since the other parameters γ andβ in Eq.…”

Section: B An MMC Model For Predicting Differential Decay Of Scalar mentioning

confidence: 99%

“…For example, differential diffusion in non-reacting flows is explored by Drake et al 30,31 , Masri et al 32 , Smith et al 33 and Dibble and Long 34 . While reacting flows are considered by Smith et al 35 and Bergmann et al 36 Most of the above cited works are for non-premixed combustion, which is also the focus of the present research, but it is noted that the effect of differential diffusion on premixed flames are significant and discussed in many publications (e.g., Kuznetsov and Sabelnikov 15 ) but not specifically considered here.…”

Section: Introductionmentioning

confidence: 99%

A multiple mapping conditioning model for differential diffusion

2014

View full text Add to dashboard Cite

This work introduces modeling of differential diffusion within the multiple mapping conditioning (MMC) turbulent mixing and combustion framework. The effect of differential diffusion on scalar variance decay is analyzed and, following a number of publications, is found to scale as Re−1/2. The ability to model the differential decay rates is the most important aim of practical differential diffusion models, and here this is achieved in MMC by introducing what is called the side-stepping method. The approach is practical and, as it does not involve an increase in the number of MMC reference variables, economical. In addition we also investigate the modeling of a more refined and difficult to reproduce differential diffusion effect – the loss of correlation between the different scalars. For this we develop an alternative MMC model with two reference variables but which also makes use of the side-stepping method. The new models are successfully validated against DNS results available in literature for homogenous, isotropic two scalar mixing.

show abstract

Application of spontaneous Raman and Rayleigh scattering and 2D LIF for the characterization of a turbulent CH 4 /H 2 /N 2 jet diffusion flame

Cited by 189 publications

References 0 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

Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals

A multiple mapping conditioning model for differential diffusion

Contact Info

Product

Resources

About