The thickened flame approach for non-premixed combustion: Principles and implications for turbulent combustion modeling

Cuenot, Bénédicte; Shum-Kivan, Francis; Blanchard, S.

doi:10.1016/j.combustflame.2021.111702

Cited by 21 publications

(9 citation statements)

References 42 publications

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“…These conditions have dramatic repercussions on the computational cost, which is driven by the necessary flame front resolution [28,29]. Artificially Thickened Flame (ATF) models [30,31] are a powerful alternative to address this challenge. In this approach, diffusivity and reaction rates are artificially varied to thicken the flame front while preserving flame speed.…”

Section: Introductionmentioning

confidence: 99%

“…This method can provide invaluable computational cost savings enabling coarser grids. ATF has been applied to a wide variety of configurations, including non-premixed combustion [31], and particularly space propulsion engines [32]. A thickened flame alters the overlapping between vortical and chemical scales, altering the original interactions between turbulence and chemistry.When a flame is artificially thickened, the Damköhler and other dimensionless numbers are altered with respect to the original configuration.…”

Section: Introductionmentioning

confidence: 99%

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Subgrid Turbulent Flux Models for Large Eddy Simulations of Diffusion Flames in Space Propulsion

Martinez-Sanchis,

Sternin,

Banik

et al. 2024

Preprint

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Subgrid scale models for unresolved turbulent fluxes are investigated with a focus on combustion for space propulsion applications. An extension to the gradient model is proposed, introducing a dependency on the local burning regime. The dynamic behavior of the model's coefficients is investigated, and scaling laws are studied. The discussed models are validated using a DNS database of a high-pressure turbulent fuel-rich methane-oxygen diffusion flame. The operating point and turbulence characteristics are selected to resemble those of modern combustors for space propulsion applications to support the future usage of the devised model in this context.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subgrid Turbulent Flux Models for Large Eddy Simulations of Diffusion Flames in Space Propulsion

Martinez-Sanchis,

Sternin,

Banik

et al. 2024

Preprint

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“…The focus in this paper will be on a particular class of turbulent combustion methods named Artificially Thickened Flame (ATF) models, also known as Thickened Flame Model (TFM). The use of ATF models is widespread in literature and has been applied in a variety of configurations, including gas turbine combustors (Gicquel et al, 2012), stratified combustion (Kazmouz et al, 2022), and even non-premixed flames (Cuenot et al, 2021) and Deflagration to Detonation Transition (Emami et al, 2015), among others. In a very recent comparative study (Kuhlmann et al, 2022), ATF was seen to perform better than a common LES alternative in predicting flame dynamics.…”

Section: Introductionmentioning

confidence: 99%

Flame Dynamics modelling using Artificial Thickened Models

Rathore

Navarro‐Martinez

2023

Preprint

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Thickened flame models are prolific in the literature and offer an effective method of resolving flame dynamics on coarse LES meshes. The current state of the art relies heavily on the use of efficiency functions to compensate for impaired wrinkling of the thickened flame. However in practice these functions can involve parameters that are difficult to determine, perform poorly outside of certain ranges or require \emph{a posteriori} analysis to evaluate performance. An alternative based on a generalised thickening is evaluated across a range of canonical configurations. The approach is demonstrated to perform well across a large range of thickening factors in capturing phenomena such as localised quenching and pinch off as well as generation of flame surface. Including good performance even in the case of large flame dynamics under acoustic forcing where the model has a clear advantage over DNS in achieving grid independence. Finally the approach is unified into an Large Eddy Simulation/Adaptive Mesh Refinement framework and applied to a turbulent Bunsen flame. The results show that even if the internal flame structure is poorly resolved on the original mesh, the global system behaviour is well predicted and compares favourably with other approaches.

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“…Multi-step chemical reaction mechanisms capture various fuel components and the intermediate species. Examples of more advanced combustion models than the model used in this paper include the eddy dissipation concept [15], the flamelet-generated manifold model [16], the thickened flame model [17] and the conditional moment closure method [18]. The judicious application of these more advanced combustion model might require adopting turbulence models that are more advanced models than the standard k-ε model used in this paper.…”

Section: Introductionmentioning

confidence: 99%

Modeling Conjugate Heat Transfer in an Anode Baking Furnace Using OpenFoam

Lahaye

Nakate

Vuik

et al. 2022

Fluids

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The operation of large industrial furnaces will continue to rely on hydrocarbon fuels in the near foreseeable future. Mathematical modeling and numerical simulation is expected to deliver key insights to implement measures to further reduce pollutant emissions. These measures include the design optimization of the burners, the dilution of oxidizer with exhaust gasses, and the mixing of natural gas with hydrogen. In this paper, we target the numerical simulation of non-premixed turbulent combustion of natural gas in a single heating section of a ring pit anode baking furnace. In previous work, we performed combustion simulations using a commercial flow simulator combined with an open-source package for the three-dimensional mesh generation. This motivates switching to a fully open-source software stack. In this paper, we develop a Reynolds-Averaged Navier-Stokes model for the turbulent flow combined with an infinitely fast mixed-is-burnt model for the non-premixed combustion and a participating media model for the radiative heat transfer in OpenFoam. The heat transfer to the refractory brick lining is taken into account by a conjugate heat transfer model. Numerical simulations provide valuable insight into the heat release and chemical species distribution in the staged combustion process using two burners. Results show that at the operating conditions implemented, higher peak temperatures are formed at the burner closest to the air inlet. This results in a larger thermal nitric-oxide concentration. The inclusion of the heat absorption in the refractory bricks results in a more uniform temperature on the symmetry plane at the center of the section. The peak in thermal nitric-oxides is reduced by a factor of four compared to the model with adiabatic walls.

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The thickened flame approach for non-premixed combustion: Principles and implications for turbulent combustion modeling

Cited by 21 publications

References 42 publications

Subgrid Turbulent Flux Models for Large Eddy Simulations of Diffusion Flames in Space Propulsion

Subgrid Turbulent Flux Models for Large Eddy Simulations of Diffusion Flames in Space Propulsion

Flame Dynamics modelling using Artificial Thickened Models

Modeling Conjugate Heat Transfer in an Anode Baking Furnace Using OpenFoam

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