State-of-the-art in premixed combustion modeling using flamelet generated manifolds

Oijen, van Ja Jeroen; Donini, A Andrea; Bastiaans, Rjm Rob; Boonkkamp, ten Jhm Jan Thije; Goey, de Lph Philip

doi:10.1016/j.pecs.2016.07.001

Cited by 287 publications

(154 citation statements)

References 110 publications

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“…However, the characteristic length scale is still sufficiently large compared to the mean free path for the combustion problem involved. Consequently, classical continuum descriptions are appropriate [66,67]. Additionally, the Reynolds number is found to be less than 680 in all of the cases examined.…”

Section: Mathematical Modelmentioning

confidence: 92%

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

Chen

Gao

2018

Catalysts

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The catalytic combustion characteristics of methane-air mixtures in small-scale systems were investigated at elevated temperatures, with particular emphasis on identifying the main factors that affect formation and removal of combustion-generated pollutants. Computational fluid dynamics simulations were performed using detailed chemical kinetic mechanisms, and more insights were offered into the phenomena occurring in the temperature range where homogeneous and heterogeneous reaction pathways are both important. Reaction engineering analysis was performed to provide an in-depth understanding of how to achieve low emissions of pollutants. Spatial distributions of the major species involved were presented to gain insight into the interplay between the two competing pathways involved. The results indicated that the distribution of oxidized products depends critically on the feed composition, dimension, temperature, and pressure. Small-scale catalytic systems enable low emissions of pollutants even in a high temperature environment, along with high combustion efficiency. The interplay between the two competing pathways via radicals is strong, and the heterogeneous pathway can significantly inhibit the homogeneous pathway. The inhibiting effect also accounts for the low emissions of nitrogen oxides. Almost all of the nitrogen oxides emitted by small-scale catalytic systems are nitric oxide. Catalytic combustion technology can be used to reduce the formation of undesired products, especially pollutant nitrogen oxide gases far below what can be achieved without catalysts. Recommendations for the design of small-scale catalytic systems are provided.

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Section: Mathematical Modelmentioning

confidence: 92%

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

Chen

Gao

2018

Catalysts

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“…Table 1 summarizes these cases. Following closely the analysis procedures discussed in Dasgupta et al [1], the "local" flame behavior is quantified via integrated flame sub-volumes, constructed to pass through localized sections of a triangulated isosurface that represents an instantaneous snapshot of the flame following the methodology in Ref. [18].…”

Section: Methodsmentioning

confidence: 99%

Analysis of chemical pathways and flame structure for n-dodecane/air turbulent premixed flames

Dasgupta

Sun

Day

et al. 2019

Combustion and Flame

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This paper analyzes turbulence-chemistry interactions for an n-dodecane-air flame, focusing on the degree to which fuel oxidation pathways change in turbulent flames relative to their corresponding laminar flames. This work is based on a lean ( =0.7) ndodecane-air flame DNS database from Aspden et al. (Proc. Combust. Institute, 36 (2017) 2005. The relative roles of dominant reactions that release heat and produce/consume radicals are examined at various turbulence intensities and compared with stretched flame calculations from counterflow flames and perfectly stirred reactors.These results show that spatially integrated (i.e. integrated heat release or radical production rate metrics averaged over the entire flame) chemical pathways are relatively insensitive to turbulence intensity and mimic the behavior of stretched flames. In other words, the contribution of a given reaction to heat release or radical production, integrated over the entire flame, is nearly independent to turbulence. Localized analysis conditioned on topological feature of the flame and on temperature is also performed.The former analysis reveals that much larger alteration of pathways occurs in the positively-curved regions of the flame. The latter localized analysis shows that peak activity in the low temperature (i.e. below 1200K) region shift towards higher temperatures with increases in Karlovitz number. This result is particularly interesting given that prior work with lighter fuels showed the opposite behavior suggesting a disparate response of the reactions involved in the fuel oxidation process to increased turbulence.

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“…A significant increase of about four times is observed for Z 2 sgs , c 2 sgs and the magnitude of [ Z c ] sgs moving from + = 0.6 to 3. The magnitude of g Zc , however, drops from 0.9 to 0.68 and it is due to the faster increase of the denominator than the numerator in Equation (17). Although it seems that the value of [ Z c ] sgs compared to Z 2 sgs and c 2 sgs is smaller for larger + , the Z-c correlation effect on combustion is more important as the filter size increases because the subgrid scalar fluctuations and their interaction become more influential and they require closure models.…”

Section: Joint Subgrid Z -C Statistics 31 Analysis Of Single Snapshmentioning

confidence: 95%

“…However, in LES this correlation is partly resolved by the numerical grid and it is of interest to understand the effect of the remaining unresolved part, [ Z c ] sgs , in Equation (1) and its behaviour with the filter size. In many existing LES models for partially premixed combustion such as the flamelet-based approaches [14][15][16][17][18][19][20][21] and conditional moment closure (CMC) with doubleconditioning [22,23], a presumed JPDF is used to account for the subgrid fluctuations of mixture fraction and progress variable. This joint PDF is computed locally using the transported scalars, usually the Favre-filtered values and subgrid variances of Z and c. The filtered thermo-chemical quantities can then be obtained from the flamelet manifolds using Φ (x, t) = F Φ (ξ, ζ ) P (ξ, ζ ; x, t) dζ dξ,…”

Section: Introductionmentioning

confidence: 99%

A priori investigation of subgrid correlation of mixture fraction and progress variable in partially premixed flames

Chen

Doan

Ruan

et al. 2018

Combustion Theory and Modelling

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Subgrid correlation of mixture fraction, Z, and progress variable, c, is investigated using direct numerical dimulation (DNS) data of a hydrogen lifted jet flame. Joint subgrid behaviour of these two scalars are obtained using a Gaussian-type filter for a broad range of filter sizes. A joint probability density function (JPDF) constructed using single-snapshot DNS data is compared qualitatively with that computed using two independent β-PDFs and a copula method. Strong negative correlation observed at different streamwise locations in the flame is captured well by the copula method. The subgrid contribution to the Z-c correlation becomes important if the filter is of the size of the laminar flame thickness or larger. A priori assessment for the filtered reaction rate using the flamelet approach with independent β-PDFs and correlated JPDF is then performed. Comparison with the DNS data shows that both models provide reasonably good results for a range of filter sizes. However, the reaction rate computed using copula JPDF is found to have a better agreement with the DNS data for large filter sizes because the subgrid Z-c correlation effect is included.

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State-of-the-art in premixed combustion modeling using flamelet generated manifolds

Cited by 287 publications

References 110 publications

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

Analysis of chemical pathways and flame structure for n-dodecane/air turbulent premixed flames

A priori investigation of subgrid correlation of mixture fraction and progress variable in partially premixed flames

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