Nonlinear evolution of 2D cellular lean hydrogen/air premixed flames with varying initial perturbations in the elevated pressure environment

Yu, Jianlin; Yu, Rixin; Bai, Xue‐Song; Sun, Mao; Tan, Jianrong

doi:10.1016/j.ijhydene.2016.07.059

Cited by 28 publications

(8 citation statements)

References 46 publications

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“…The characteristic features of thermodiffusively unstable flames, such as the formation of small cellular structures, the strong variability of reaction rates along the flame front, and the enhanced consumption speed, have been extensively studied in laminar flows [4][5][6][7][8][9][10]. In particular, the enhancement of the overall consumption speed is found to be not only caused by an increase of flame surface area, but also by an enhanced fuel consumption rate per flame surface area, which is referred to as the stretch factor I 0 .…”

Section: Introductionmentioning

confidence: 99%

Synergistic interactions of thermodiffusive instabilities and turbulence in lean hydrogen flames

Berger

Attili

Pitsch

2022

Combustion and Flame

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Section: Introductionmentioning

confidence: 99%

Synergistic interactions of thermodiffusive instabilities and turbulence in lean hydrogen flames

Berger

Attili

Pitsch

2022

Combustion and Flame

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“…The long-term dynamics of lean premixed hydrogen flames have been analyzed in several numerical studies [2][3][4][5][6][7][8][9][10][11]. In all studies, the formation of small cellular structures that merge to larger cells and split again into smaller cells is observed along the flame front.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic instabilities in premixed hydrogen flames: parametric variation of pressure, equivalence ratio, and temperature. Part 2 – Non‐linear regime and flame speed enhancement

Berger

Attili

Pitsch

2022

Combustion and Flame

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“…Local grid refinement ensures that the flame is resolved with at least 20 grid points. It has been shown that computations of unstable H 2 -air flames can depend significantly on the grid resolution, initialization, and numerical setup [11,12]. Therefore, the FPV calculations are based on the same numerical setup as the DC calculation.…”

Section: Numerical Setupmentioning

confidence: 99%

“…So far, numerical studies of intrinsic flame instabilities have usually been based on DNS. It has been shown that reliable simulations addressing flame instabilities require considerable computational resources since the formation and evolution of intrinsic instabilities can be sensitive to domain size, grid resolution, and the numerical methods employed [9,11,12]. Therefore, such investigations are restricted to academic configurations, which are also well-suited for model development.…”

Section: Introductionmentioning

confidence: 99%

Flamelet modeling of thermo-diffusively unstable hydrogen-air flames

Böttler,

Lulic,

Steinhausen

et al. 2023

Preprint

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In order to reduce CO2 emissions, hydrogen combustion has become increasingly relevant for technical applications. In this context, lean H2-air flames show promising features but, among other characteristics, they tend to exhibit thermo-diffusive instabilities. The formation of cellular structures associated with these instabilities leads to an increased flame surface area which further promotes the flame propagation speed, an important reference quantity for design, control, and safe operation of technical combustors. While many studies have addressed the physical phenomena of intrinsic flame instabilities in the past, there is also a demand to predict such flame characteristics with reduced-order models to allow computationally efficient simulations. In this work, a H2-air spherical expanding flame, which exhibits thermo-diffusive instabilities, is studied with flamelet-based modeling approaches both in a-priori and a-posteriori manner. A recently proposed Flamelet/Progress Variable (FPV) model, with a manifold based on unstretched planar flames, and a novel FPV approach, which takes into account a large curvature variation in the tabulated manifold, are compared to detailed chemistry (DC) calculations. Both flamelet approaches account for differential diffusion utilizing a coupling strategy which is based on the transport of major species instead of transporting the manifold control variables. First, both FPV approaches are assessed in terms of an a-priori test with the DC reference dataset. Thereafter, the a-posteriori assessment contains two parts: a linear stability analysis of perturbed planar flames and the simulation of the spherical expanding flame. Both FPV models are systematically analyzed considering global and local flame properties in comparison to the DC reference data. It is shown that the new FPV model, incorporating large curvature variations in the manifold, leads to improved predictions for the microstructure of the corrugated flame front and the formation of cellular structures, while global flame properties are reasonably well reproduced by both models.

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Nonlinear evolution of 2D cellular lean hydrogen/air premixed flames with varying initial perturbations in the elevated pressure environment

Cited by 28 publications

References 46 publications

Synergistic interactions of thermodiffusive instabilities and turbulence in lean hydrogen flames

Synergistic interactions of thermodiffusive instabilities and turbulence in lean hydrogen flames

Intrinsic instabilities in premixed hydrogen flames: parametric variation of pressure, equivalence ratio, and temperature. Part 2 – Non‐linear regime and flame speed enhancement

Flamelet modeling of thermo-diffusively unstable hydrogen-air flames

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