A Comparative Study of the Simulation of Turbulent Ethanol Spray Flames

Heye, Colin; Kourmatzis, Agisilaos; Raman, Venkat; Masri, Assaad R.

doi:10.1007/978-3-319-04678-5_2

Cited by 3 publications

(5 citation statements)

References 32 publications

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“…It has been demonstrated that the approach is able to reproduce the temporal statistics of the flow-field reasonably well. Regarding the scalar statistics of the carrier phase, an underestimation of the flame propagation towards the jet centerline has been revealed, which is similar to the previous observations of [7,46]. Nonetheless, as can be seen from the centerline evolution of the carrier scalars shown in Figure 5, the LES-ESF simulations predict an earlier propagation of the flame towards the center of the spray jet, which comes closer to the experiments than the ATF results shown.…”

Section: Discussionsupporting

confidence: 87%

“…This can be observed in Figure 4a at the axial positions x = 10D and x = 20D. The results suggest that all simulations are underpredicting the flame propagation towards the jet center, a matter that was observed in our previous work for the ATF model [7] and in the LES shown by Heye et al [46] for the two spray flames EtF2 and EtF6. The possible reasons for this behavior can be divided into two categories: (1) Deviations related to the modeling strategy and (2) uncertainty in boundary conditions (or a combination of both).…”

Section: Flame Characteristics and Carrier Phase Analysissupporting

confidence: 69%

“…However, depending on the flow characteristics inside the central jet, the spray dynamics may change, yielding different spatial distributions of the fuel at the burner exit (for instance, due to the development of a liquid film at the pipe walls [41]). As pointed out in the conclusions presented in [46], non-homogeneous mixtures at the burner exit may significantly impact the development and propagation of the flame front.…”

Section: Flame Characteristics and Carrier Phase Analysismentioning

confidence: 84%

“…The uncertainties in the boundary conditions are mainly related to the mixture composition at the burner exit. In this work as well as in previous simulations of various configurations of the Sydney Spray Burner [7,9,42,[44][45][46]77], a homogeneous distribution of fuel within the spray pipe is assumed. However, depending on the flow characteristics inside the central jet, the spray dynamics may change, yielding different spatial distributions of the fuel at the burner exit (for instance, due to the development of a liquid film at the pipe walls [41]).…”

Section: Flame Characteristics and Carrier Phase Analysismentioning

confidence: 99%

“…In the context of transported PDF methods applied to this burner, only a few contributions can be found in the literature. To mention are two publications by Heye et al [45,46]. In [45], a particle-based transported PDF approach is coupled to LES and the approach is validated for the spray flame EtF1.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Prediction of Turbulent Spray Flame Characteristics Using the Filtered Eulerian Stochastic Field Approach Coupled to Tabulated Chemistry

Dreßler

Filho

Ries

et al. 2021

Fluids

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The Eulerian stochastic fields (ESF) method, which is based on the transport equation of the joint subgrid scalar probability density function, is applied to Large Eddy Simulation of a turbulent dilute spray flame. The approach is coupled with a tabulated chemistry approach to represent the subgrid turbulence–chemistry interaction. Following a two-way coupled Eulerian–Lagrangian procedure, the spray is treated as a multitude of computational parcels described in a Lagrangian manner, each representing a heap of real spray droplets. The present contribution has two objectives: First, the predictive capabilities of the modeling framework are evaluated by comparing simulation results using 8, 16, and 32 stochastic fields with available experimental data. At the same time, the results are compared to previous studies, where the artificially thickened flame (ATF) model was applied to the investigated configuration. The results suggest that the ESF method can reproduce the experimental measurements reasonably well. Comparisons with the ATF approach indicate that the ESF results better describe the flame entrainment into the cold spray core of the flame. Secondly, the dynamics of the subgrid scalar contributions are investigated and the reconstructed probability density distributions are compared to common presumed shapes qualitatively and quantitatively in the context of spray combustion. It is demonstrated that the ESF method can be a valuable tool to evaluate approaches relying on a pre-integration of the thermochemical lookup-table.

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Section: Discussionsupporting

confidence: 87%

Section: Flame Characteristics and Carrier Phase Analysissupporting

confidence: 69%

Section: Flame Characteristics and Carrier Phase Analysismentioning

confidence: 84%

Section: Flame Characteristics and Carrier Phase Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Prediction of Turbulent Spray Flame Characteristics Using the Filtered Eulerian Stochastic Field Approach Coupled to Tabulated Chemistry

Dreßler

Filho

Ries

et al. 2021

Fluids

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Influence of Thickening Factor Treatment on Predictions of Spray Flame Properties Using the ATF Model and Tabulated Chemistry

Dreßler

Filho²,

Sadiki

et al. 2020

Flow Turbulence Combust

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Different strategies to account for the heat and mass transfer between liquid droplets and their carrier phase within the Artificially Thickened Flame (ATF) approach are analyzed and compared. Herein, two approaches are introduced to take into account the droplet movement relative to the thickened flame front orientation. While the first approach achieves this behavior through scalar modifications in the droplet temperature and mass evolution equations, the second one introduces a trajectory modification within the thickened flame front. Both approaches, referred to as projection and refraction correction, are first compared to state of the art methods in a simplified two-dimensional configuration, and then in a complex turbulent spray flame. The investigated spray flame corresponds to the operating condition EtF6 of the Sydney Spray Burner. The analysis showed that: (1) A consideration of a simplified configuration is insufficient to fully uncover the performance of the different approaches. (2) While the proposed approaches performed best in the two-dimensional configuration, only the projection method outperforms the remaining ones in the turbulent spray flame. (3) The formulation to consider the flame thickening has a strong effect on global flame properties, combustion regime distribution as well as carrier and liquid phase statistics.

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Sensitivities in the Modeling of Electrostatically Charged Droplet Evaporation and Combustion

Kourmatzis

2017

J. Energy Eng.

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A Comparative Study of the Simulation of Turbulent Ethanol Spray Flames

Cited by 3 publications

References 32 publications

Numerical Prediction of Turbulent Spray Flame Characteristics Using the Filtered Eulerian Stochastic Field Approach Coupled to Tabulated Chemistry

Numerical Prediction of Turbulent Spray Flame Characteristics Using the Filtered Eulerian Stochastic Field Approach Coupled to Tabulated Chemistry

Influence of Thickening Factor Treatment on Predictions of Spray Flame Properties Using the ATF Model and Tabulated Chemistry

Sensitivities in the Modeling of Electrostatically Charged Droplet Evaporation and Combustion

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