Modeling chemical flame structure and combustion dynamics in LES

Auzillon, Pierre; Fiorina, Benoît; Vicquelin, Ronan; Darabiha, Nasser; Gicquel, Olivier; Veynante, Denis

doi:10.1016/j.proci.2010.05.045

Cited by 30 publications

(22 citation statements)

References 27 publications

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“…Even though this perspective is exciting and will certainly become true in the next years for simplified lab-scale burners [205,278], it remains probably a very long term option in gas turbines. First, as pointed out in [190,279], conventional approximations provided for the filtered viscous stress tensor may not be sufficient to fully recover expected flame behaviors in the context of fully resolved premixed flames [191]. LES models do not converge to DNS when the number of grid points increases because SGS models usually neglect certain effects.…”

Section: Leadership-class Les Modeling and Predictionsmentioning

confidence: 99%

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Gicquel

Staffelbach

Poinsot

2012

Progress in Energy and Combustion Science

407

183

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Section: Leadership-class Les Modeling and Predictionsmentioning

confidence: 99%

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Gicquel

Staffelbach

Poinsot

2012

Progress in Energy and Combustion Science

407

183

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“…More detailed combustion models are now commonly used to simulate the response of flames to flow forcing. [42][43][44][45] A different approach is undertaken in this work, where only the steady, reacting base flow is solved by direct simulation of the nonlinear Navier-Stokes equations assuming that chemistry proceeds through one irreversible reaction. The unsteady response of the flame is subsequently determined by solving a linearized version of these equations around this base state.…”

Section: Introductionmentioning

confidence: 99%

Response analysis of a laminar premixed M-flame to flow perturbations using a linearized compressible Navier-Stokes solver

Blanchard

Schuller

Sipp³

et al. 2015

Physics of Fluids

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International audienceThe response of a laminar premixed methane-air flame subjected to flow perturbations around a steady state is examined experimentally and using a linearized compressible Navier-Stokes solver with a one-step chemistry mechanism to describe combustion. The unperturbed flame takes an M-shape stabilized both by a central bluff body and by the external rim of a cylindrical nozzle. This base flow is computed by a nonlinear direct simulation of the steady reacting flow, and the flame topology is shown to qualitatively correspond to experiments conducted under comparable conditions. The flame is then subjected to acoustic disturbances produced at different locations in the numerical domain, and its response is examined using the linearized solver. This linear numerical model then allows the componentwise investigation of the effects of flow disturbances on unsteady combustion and the feedback from the flame on the unsteady flow field. It is shown that a wrinkled reaction layer produces hydrodynamic disturbances in the fresh reactant flow field that superimpose on the acoustic field. This phenomenon, observed in several experiments, is fully interpreted here. The additional perturbations convected by the mean flow stem from the feedback of the perturbed flame sheet dynamics onto the flow field by a mechanism similar to that of a perturbed vortex sheet. The different regimes where this mechanism prevails are investigated by examining the phase and group velocities of flow disturbances along an axis oriented along the main direction of the flow in the fresh reactant flow field. It is shown that this mechanism dominates the low-frequency response of the wrinkled shape taken by the flame and, in particular, that it fully determines the dynamics of the flame tip from where the bulk of noise is radiated

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“…The flame is here modeled by a progress variable Y c , monotonically increasing from 0 in the fresh gases to Y eq c in the burnt gases. In practical meshes, the flame thickness, defined as d Y c ¼ Y eq c =maxðjrY c jÞ, is thinner than the mesh size D x [7,8]. Therefore, filtering the progress variable field at the width D introduces a resolved flame front of thickness d e Y c % D with D % 3D x .…”

Section: Introductionmentioning

confidence: 99%

“…Initially developed for infinitely thin flame front and for single-step chemistry [14][15][16], this strategy has recently been extended to tabulated chemistry by the Filtered Tabulated Chemistry for LES (F-TACLES) model [9,17]. Simulations of propagating filtered premixed planar flames show that the flame resolution criterion D=D x depends on numerical conditions [18]. For instance, the criteria D=D x P 8 is required in [9] to predict the proper propagation speed of a laminar premixed filtered flame.…”

Section: Introductionmentioning

confidence: 99%

LES of turbulent combustion: On the consistency between flame and flow filter scales

Mercier

Moureau

Veynante

et al. 2015

Proceedings of the Combustion Institute

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A recurrent issue in premixed combustion LES is that the flame thickness is smaller than the grid size. Broadening of the reactive layer is then mandatory to ensure a proper propagation of the filtered flame front. The reactive flow governing equations exhibit then two filter operators of different sizes dedicated to the flow field and the flame front, respectively. The consistency issues between flame and flow filter sizes in LES of turbulent premixed flames are discussed in the present article. A general mathematical formalism considering two different filter sizes is proposed. A new closure of the resulting LES balance equations system is derived in the framework of the Filtered TAbulated Chemistry for LES (F-TACLES) formalism. The new model, called F2-TACLES, is first validated by computing 1-D premixed filtered flames. Then an LES of the complex turbulent premixed PRECCINSTA swirl burner is successfully performed. In particular, the new model formulation improves the prediction of resolved flame/turbulence interactions.

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Modeling chemical flame structure and combustion dynamics in LES

Cited by 30 publications

References 27 publications

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Response analysis of a laminar premixed M-flame to flow perturbations using a linearized compressible Navier-Stokes solver

LES of turbulent combustion: On the consistency between flame and flow filter scales

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