Fuel Composition Effects on Flame Stretch in Turbulent Premixed Combustion: Numerical Analysis of Flame-Vortex Interaction and Formulation of a New Efficiency Function

Bougrine, Sabre; Richard, Stéphane; Colin, Olivier; Veynante, Denis

doi:10.1007/s10494-014-9546-4

Cited by 32 publications

(34 citation statements)

References 54 publications

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“…Finally, this kind of model is useful in the system simulation context for describing premixed combustion processes in SI engines [10,14,13]. However, it can also be used in 3-D simulations during the instants following sparking to describe the early flame kernel growth.…”

Section: Discussionmentioning

confidence: 99%

“…A key point of CFM1D is that the flame wrinkling evolution is described by a new 0-D equation derived from the flame surface density (FSD) transport equation of ECFM. CFM1D was successfully applied to the combustion of gasoline [10], methane [13] or ethanol blends [14] in SI engines but no academic validation was conducted to check the intrinsic quality of the reduction methodology. The objective of this paper is thus to present in details the theoretical bases of the flame wrinkling equation as well as the underlying assumptions.…”

Section: Introductionmentioning

confidence: 99%

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A 0-D flame wrinkling equation to describe the turbulent flame surface evolution in SI engines

Richard

Veynante

2015

Comptes Rendus Mécanique

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The current development of reciprocating engines relies increasingly on system simulation for both design activities and conception of algorithms for engine control. These numerical simulation tools require high computational efficiencies, as calculations have to be performed in times close to real-time. Then, they are today mainly based on simple empirical laws to describe the combustion processes in the cylinders. However, with the rapid evolution of emission regulations and fuel formulation, more and more physics is expected in combustion models. A solution consists in reducing 3-D combustion models to build 0-dimensional models that are both CPU-efficient and based on physical quantities. This approach has been used in a previous work to reduce the 3-D ECFM (Extended Coherent Flame Model), leading to the so-called CFM1D. A key feature of the latter is to be based on a 0-D equation for the flame wrinkling derived from the 3-D equation for the flame surface density. The objective of this paper is to present in details the theoretical derivation of the wrinkling equation and the underlying modeling assumptions as well. Academic validations are performed against experimental data for several turbulence intensities and fuels. Finally, the proposed model is applied to engine simulations for a wide range of operating conditions. Comparisons are successfully conducted between incylinder measurements and the model predictions, highlighting the interest of reducing 3-D CFD models for calculations performed in the context of system simulation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A 0-D flame wrinkling equation to describe the turbulent flame surface evolution in SI engines

Richard

Veynante

2015

Comptes Rendus Mécanique

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“…Direct numerical simulations of flame/vortex interactions have now become very common (Poinsot et al 1991;Najm et al 1998;Charlette et al 2002;Bougrine et al 2014). Here, similar simulations are carried out using the high-order code AVBP (Schønfeld & Rudgyard 1999;Moureau et al 2005) developed by CERFACS and IFP-EN.…”

Section: Numerical Simulations Of Fvismentioning

confidence: 99%

“…There is a wealth of experimental (Roberts & Driscoll 1991;Roberts et al 1993;Mueller et al 1996;Sinibaldi et al 2003;Thiesset et al 2017) and numerical (Poinsot, Veynante & Candel 1991;Charlette, Meneveau & Veynante 2002;Bougrine et al 2014) studies devoted to FVIs. A review by Renard et al (2000) was also dedicated to this topic.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, these results yielded expression of efficiency functions, i.e. the transfer function between vortex strength and flame stretch Charlette et al 2002;Bougrine et al 2014;Thiesset et al 2017) which are largely employed in LES of turbulent premixed combustion. It is also an archetypal situation in which some experimentally measurable surrogates of the heat release can be tested (Najm et al 1998).…”

Section: Introductionmentioning

confidence: 99%

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Isolating strain and curvature effects in premixed flame/vortex interactions

et al. 2017

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This study focuses on the response of premixed flames to a transient hydrodynamic perturbation in an intermediate situation between laminar stretched flames and turbulent flames: an axisymmetric vortex interacting with a flame. The reasons motivating this choice are discussed in the framework of turbulent combustion models and flame response to the stretch rate. We experimentally quantify the dependence of the flame kinematic properties (displacement and consumption speeds) to geometrical scalars (stretch rate and curvature) in flames characterized by different effective Lewis numbers. Whilst the displacement speed can be readily measured using particle image velocimetry and tomographic diagnostics, providing a reliable estimate of the consumption speed from experiments remains particularly challenging. In the present work, a method based on a budget of fuel on a well chosen domain is proposed and validated both experimentally and numerically using two-dimensional direct numerical simulations of flame/vortex interactions. It is demonstrated that the Lewis number impact neither the geometrical nor the kinematic features of the flames, these quantities being much more influenced by the vortex intensity. While interacting with the vortex, the flame displacement (at an isotherm close to the leading edge) and consumption speeds are found to increase almost independently of the type of fuel. We show that the total stretch rate is not the only scalar quantity impacting the flame displacement and consumption speeds and that curvature has a significant influence. Experimental data are interpreted in the light of asymptotic theories revealing the existence of two distinct Markstein numbers, one characterizing the dependence of flame speed to curvature, the other to the total stretch rate. This theory appears to be well suited for representing the evolution of the displacement speed with respect to either the total stretch rate, curvature or strain rate. It also explains the limited dependence of the flame displacement speed to Lewis number and the strong correlation with curvature observed in the experiments. An explicit relationship between displacement and consumption speeds is also given, indicating that the fuel consumption rate is likely to be altered by both the total stretch rate and curvature.

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A Strategy to Couple Thickened Flame Model and Adaptive Mesh Refinement for the LES of Turbulent Premixed Combustion

Mehl

Liu

Colin

2021

Flow Turbulence Combust

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A trend towards the increasing use of Adaptive Mesh Refinement (AMR) algorithms to simulate combustion processes is seen in the recent literature. AMR is attractive as it enables the physical phenomena of interest to be tracked by the numerical mesh, reducing the computational cost drastically. It is particularly efficient for combustion as small computational cells are needed very locally to resolve the flame structure. However, the questions arising from the coupling between AMR and the turbulent flame propagation has rarely been investigated so far. Indeed, the incomplete cascading of turbulent structures from a relatively coarse mesh used to solve the flow to a finer mesh solving the flame has implications on the turbulent combustion model which must be considered. In the present paper, a strategy for coupling AMR with the Thickened Flame Model (TFM) is proposed. It is shown that, under conditions relevant to industrial cases, the standard TFM model strongly under-estimates the turbulent flame propagation when the effects of AMR is not taken into account. A new model, AMR-E, is introduced to take this effect into account. The behavior of the model is first analyzed on an a priori 1Dstudy and is consequently validated on a 3-D turbulent flame propagation in Homogeneous Isotropic Turbulence (HIT). In particular, it is shown that the C.

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Fuel Composition Effects on Flame Stretch in Turbulent Premixed Combustion: Numerical Analysis of Flame-Vortex Interaction and Formulation of a New Efficiency Function

Abstract: International audienc

Cited by 32 publications

References 54 publications

A 0-D flame wrinkling equation to describe the turbulent flame surface evolution in SI engines

A 0-D flame wrinkling equation to describe the turbulent flame surface evolution in SI engines

Isolating strain and curvature effects in premixed flame/vortex interactions

A Strategy to Couple Thickened Flame Model and Adaptive Mesh Refinement for the LES of Turbulent Premixed Combustion

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