Flamelet modeling of forced ignition and flame propagation in hydrogen-air mixtures

Böttler, Hannes; Chen, X.; Xie, Shumeng; Scholtissek, Arne; Chen, Z.; Hasse, Christian

doi:10.1016/j.combustflame.2022.112125

Cited by 13 publications

(13 citation statements)

References 62 publications

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“…Two flamelet-based modeling approaches are investigated: (1) a recently proposed FPV approach using a three-dimensional manifold (ψ(Z Bilger , h, Y c )) which was created from unstretched flame solutions with varying enthalpy levels h (referred to as FPV-h) [19] and (2) a novel three-dimensional tabulation approach taking into account negative and positive curvature κ c (referred to as FPV-κ c ). First, the novel tabulation approach is presented, followed by a description of the numerical setup of the unstable lean H 2 -air SEF.…”

Section: Methodsmentioning

confidence: 99%

“…Promising modeling approaches, taking into account detailed kinetics and their interaction with transport, include flamelet-based models such as the Flamelet/Progress Variable (FPV) approach [13], Flamelet Generated Manifolds (FGM) [14], or the Flame Prolongation for ILDM (FPI) model [15]. While manifolds for non-premixed combustion are usually generated from stretched non-premixed flamelets [16], manifolds for premixed combustion can recover moderate stretch effects even when being generated from unstretched premixed flamelets [14,[17][18][19]. Nevertheless, attempts have also been made to generate manifolds from stretched premixed flamelets [14,20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Many advancements were aiming for improved predictions of the local mixture composition which has been realized via mixture fraction definitions based on elemental mass fractions, such as the Bilger mixture fraction, and efforts have been made to model its diffusivity [14,20,22]. Recently, different model extensions have been developed to improve the predictions of flamelet-based models for hydrogen combustion, where differential diffusion effects need to be captured accurately [17][18][19]. For TD unstable flames, which exhibit large curvature variations due to flame front corrugations, the suitability of these manifolds needs to be further investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The objective of this study is twofold: (1) a novel flamelet tabulation approach is presented which takes into account differential diffusion and large curvature variations (positive and negative curvature range). It is studied together with a previously developed manifold constructed from unstretched premixed flames [19]. The predictive capabilities of both manifolds are first assessed by comparison to DC reference results of the unstable lean H 2 -air SEF also studied by Wen et al [23] (a-priori analysis).…”

Section: Introductionmentioning

confidence: 99%

“…( 2) The new manifold is then coupled to a CFD solver in a modified FPV approach for premixed combustion and utilized to simulate planar flames and the lean H 2 -air SEF (a-posteriori analysis). The FPV modeling approach from our previous work [19] is employed in a similar manner. Both FPV models are examined a-posteriori by means of a linear stability analysis (planar flames) and the global characteristics of the SEF, as well as its cellular microstructure.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Flamelet modeling of thermo-diffusively unstable hydrogen-air flames

Böttler,

Lulic,

Steinhausen

et al. 2023

Preprint

View full text Add to dashboard Cite

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Risk Identification and Safety Technology for Hydrogen Production from Natural Gas Reforming

Feng,

Gu,

Pang

et al. 2024

ChemBioEng Reviews

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The hydrogen production from natural gas has advantages of low investment, low carbon emission, and high hydrogen production rate. This paper briefly describes the technical overview of hydrogen production from natural gas reforming and identifies its risk factors. According to the dangerous characteristics of high reaction temperature, easy leakage of reaction medium, flammability, and explosion in the process, the intrinsic safety of the process is discussed in combination with relevant research and industrial experience. The safety requirements of key equipment and materials are introduced in detail, followed by the optimization methods of process safety that can be taken in the engineering process. Besides, the accident prevention measures for emergency shutdown and fire explosion are summarized. Finally, the future research demands are put forward from the perspective of research and development, which is instructive for the safe hydrogen production from natural gas in the future.

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