LES Modeling of the Impact of Heat Losses and Differential Diffusion on Turbulent Stratified Flame Propagation: Application to the TU Darmstadt Stratified Flame

Mercier, Renaud; Auzillon, Pierre; Moureau, Vincent; Darabiha, Nasser; Gicquel, Olivier; Veynante, Denis; Fiorina, Benoît

doi:10.1007/s10494-014-9550-8

Cited by 31 publications

(47 citation statements)

References 43 publications

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“…For the considered configuration which features heat losses, the effect of enthalpy variations on the combustion model is accounted for with a non-adiabatic extension [28,37] of the F-TACLES model. For perfectly-premixed conditions as studied here, the different physical variables are only tabulated as a function of a progress variable Y c and a heat losses correction coefficient [28].…”

Section: Turbulent Reactive Flowmentioning

confidence: 99%

“…The coupling frequency with the radiation solver was however strongly limited. Regarding the retained approach in the present study, the large-eddy simulation benefits from the continuous advances in combustion modeling [25], in particular on the effect of variable enthalpy due to heat losses on the flame structure and its stabilization [24,[26][27][28]. The conjugate heat transfer is accounted for by solving the heat conduction within the combustor walls.…”

Section: Introductionmentioning

confidence: 99%

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High-Fidelity Multiphysics Simulation of a Confined Premixed Swirling Flame Combining Large-Eddy Simulation, Wall Heat Conduction and Radiative Energy Transfer

Koren

Vicquelin

Gicquel

2017

Volume 5C: Heat Transfer

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A multi-physics simulation combining large-eddy simulation, conjugate heat transfer and radiative heat transfer is used to predict the wall temperature field of a confined premixed swirling flame operating under atmospheric pressure. The combustion model accounts for the effect of enthalpy defect on the flame structure whose stabilization is here sensitive to the wall heat losses. The conjugate heat transfer is accounted for by solving the heat conduction within the combustor walls and with the Hybrid-Cell Neumann-Dirichlet coupling method, enabling to dynamically adapt the coupling period. The exact radiative heat transfer equation is solved with an advanced Monte Carlo method with a local control of the statistical error. The coupled simulation is carried out with or without accounting for radiation. Excellent results for the wall temperature are achieved by the fully coupled simulation which are then further analyzed in terms of radiative effects, global energy budget and fluctuations of wall heat flux and temperature.

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Section: Turbulent Reactive Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Fidelity Multiphysics Simulation of a Confined Premixed Swirling Flame Combining Large-Eddy Simulation, Wall Heat Conduction and Radiative Energy Transfer

Koren

Vicquelin

Gicquel

2017

Volume 5C: Heat Transfer

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show abstract

“…Accordingly, the simulations predicted too large temperatures in this region and despite possible modeling uncertainties, this is quite certainly attributed to this effect. Therefore, another approach was discussed at the TNF workshop [27] and adopted by several groups [11,13] afterwards. With the actual wall temperatures being still unknown, it uses the measured temperature at 15 mm above the tube's exit as an a priori knowledge to provide corresponding inlet conditions for the simulation.…”

Section: Treatment Of the Thermal Boundary Conditionsmentioning

confidence: 99%

“…With the actual wall temperatures being still unknown, it uses the measured temperature at 15 mm above the tube's exit as an a priori knowledge to provide corresponding inlet conditions for the simulation. Furthermore, the temperature of the inner wall is set according to a coupled RANS simulation [13] whereas the heat transfer at the outer wall surface towards slot 1 is still neglected. This approach mostly led to improved predictions and showed a flame lift-off not present in the adiabatic simulations.…”

Section: Treatment Of the Thermal Boundary Conditionsmentioning

confidence: 99%

“…The burner investigated here is the Darmstadt stratified burner where previous numerical studies have been carried out by Roux and Pitsch [9], Trisjono et al [10,11], Cavallo Marincola et al [12], Mercier et al [13], and Kuenne et al [7]. The issue investigated within this study arose from the findings of previous simulations as well as experimental observations.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Study of the Flame Stabilization Mechanism Being Determined by Chemical Reaction Rates Submitted to Heat Transfer Processes

Kuenne

Euler²,

Ketelheun³

et al. 2014

Zeitschrift Für Physikalische Chemie

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Large Eddy Simulations of a turbulent lean premixed stratified burner are conducted in order to determine the physical mechanisms that dominate the flame stabilization close to burner walls. The purpose of this work is both to provide insight into the underlying physics as well as to check whether the deficiencies found in previous simulations are related to an inappropriate heat transfer treatment. The simulation utilizes a three-dimensional detailed chemistry database in order to capture the chemical reaction rates based on local mixing and thermal conditions. The study is supplemented by very accurate wall temperature measurements to remove the large uncertainty revealed in the past for this configuration. The results obtained from the simulations are evaluated by means of a qualitative illustration of the different flame stabilizations and comparisons with experimental data.

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Modeling Combustion Chemistry in Large Eddy Simulation of Turbulent Flames

Fiorina

Veynante

Candel

2014

Flow Turbulence Combust

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Flame ignition, stabilization and extinction or pollutant predictions are crucial issues in Large Eddy Simulations (LES) of turbulent combustion. These phenomena are strongly influenced by complex chemical effects. Unfortunately, despite the rapid increase in computational power, performing turbulent simulations of industrial configurations including detailed chemical mechanisms will still remain out of reach for a long time. This article proposes a review of commonly-used approaches to address fluid/chemistry interactions at a reduced computational cost. Several chemistry modeling routes are first examined with a focus on tabulated chemistry techniques. The problem of coupling chemistry with LES is considered in a second step. Examples of turbulent combustion simulations are presented in the final part of the article. Three LES applications are analyzed: a lean swirled combustor, a non-adiabatic turbulent stratified flame and a combustion chamber where internal recirculations promote the dilution of fresh gases by burnt gases. Keywords Turbulent combustion • Large Eddy Simulation • Tabulated chemistry • Complex chemistry 1 Introduction Combustion accounts for about 90 % of the global consumption of primary energy [1]. Despite its environmental impact this share will probably not fall in the near future. Combustion delivers energy which is immediately available through the exothermic conversion of gaseous, liquid or solid fuels. There are no other way to provide energy which are as convenient and as effective. In automotive or aerospace applications, combustion provides

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LES Modeling of the Impact of Heat Losses and Differential Diffusion on Turbulent Stratified Flame Propagation: Application to the TU Darmstadt Stratified Flame

Cited by 31 publications

References 43 publications

High-Fidelity Multiphysics Simulation of a Confined Premixed Swirling Flame Combining Large-Eddy Simulation, Wall Heat Conduction and Radiative Energy Transfer

High-Fidelity Multiphysics Simulation of a Confined Premixed Swirling Flame Combining Large-Eddy Simulation, Wall Heat Conduction and Radiative Energy Transfer

A Numerical Study of the Flame Stabilization Mechanism Being Determined by Chemical Reaction Rates Submitted to Heat Transfer Processes

Modeling Combustion Chemistry in Large Eddy Simulation of Turbulent Flames

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