Propagation of premixed flames in the presence of Darrieus–Landau and thermal diffusive instabilities

Creta, Francesco; Lapenna, Pasquale Eduardo; Lamioni, Rachele; Fogla, Navin; Matalon, Moshe

doi:10.1016/j.combustflame.2020.02.030

Cited by 54 publications

(24 citation statements)

References 58 publications

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“…Their size, however, seems to remain essentially constant at the larger domain size of simulation TD3. A domain independence of spatial scales is thus achieved for a sufficiently large domain size, a finding that was observed both for hydrogen flames [3] as well as in the context of one-step chemistry [2,7].…”

Section: One-step Chemistry Datasetmentioning

confidence: 64%

“…In this work, we employ two recently developed two-dimensional (2D) DNS datasets of large-scale thermo-diffusively unstable premixed flames, namely a one-step chemistry [2] and a multi-step chemistry hydrogen/air dataset [3], both briefly described in the following.…”

Section: Datasets Descriptionmentioning

confidence: 99%

“…In [3,7], it was found that thermo-diffusively unstable flames achieve domain independence for domain sizes larger than ∼25 − 30λ c . The DNS datasets analysed in this work feature spanwise domain sizes as large as 76λ c for the one-step chemistry dataset [2] and 300λ c for the multi-step dataset [3]. For both datasets, body forces due to gravity have not been considered.…”

Section: Datasets Descriptionmentioning

confidence: 99%

“…The one-step chemistry dataset has been presented in [2] and it has also been used for modelling purposes in [7]. It has been developed using a well-established numerical framework based on a one-step irreversible reaction controlled by the concentration of a deficient reactant [16][17][18][19].…”

Section: One-step Chemistry Datasetmentioning

confidence: 99%

“…The conformation of such fronts is further affected by hydrodynamic (or Darrieus-Landau) instabilities caused by thermal expansion, which are active at all perturbation wavelengths. The interaction of these intrinsic instability mechanisms is indeed complex and non-linear and ultimately leads to highly convoluted morphological flame conformations [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Data-driven subfilter modelling of thermo-diffusively unstable hydrogen–air premixed flames

Lapenna

Berger

Attili

et al. 2021

Combustion Theory and Modelling

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This article is dedicated to Moshe Matalon on the occasion of his 70th birthday, for his numerous contributions to the field of combustion and, in particular, to the rich and varied topic of premixed flame stability. Here, we follow in his footsteps and propose a subfilter modelling framework for thermo-diffusively unstable premixed flames, such as lean hydrogen-air flames. Performing an optimal estimator analysis for the unfiltered and filtered heat release rate of the lean premixed hydrogen-air flames, the latter is found to require at least two scalars for an appropriate representation while for large filter sizes, the heat release appears to require only one scalar for parametrisation. As a result, we develop a modelling strategy based on the construction of thermochemical tables for each unclosed term as a function of two variables as well as the filter size. The framework is based on the filtered tabulated chemistry approach, where, in lieu of a one-dimensional unstretched flame, we adopt a data-driven paradigm and filter fully resolved two-dimensional simulations of variable size. Models originating from small-and medium-sized simulations are tested a-priori on a large-size simulation, thus highlighting the role of the lateral domain in the dataset used for tabulation. The concept of a minimum domain size is thus discussed, leading to a dataset exhibiting the minimal properties for sufficiently accurate thermochemical tables. The strategy is shown to be more accurate than a classical one-dimensional filtered tabulated chemistry approach and shows promise in future LES modelling of laboratory and industrial scale hydrogen flames.

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Section: One-step Chemistry Datasetmentioning

confidence: 64%

Section: Datasets Descriptionmentioning

confidence: 99%

Section: Datasets Descriptionmentioning

confidence: 99%

Section: One-step Chemistry Datasetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Data-driven subfilter modelling of thermo-diffusively unstable hydrogen–air premixed flames

Lapenna

Berger

Attili

et al. 2021

Combustion Theory and Modelling

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Effect of Turbulence and Diffusional–Thermal Instability on Hydrogen‐Rich Syngas Turbulent Premixed Flame

Zhang,

Li,

et al. 2023

Energy Tech

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As a kind of fuel with low‐carbon emissions, hydrogen‐rich syngas has a large resource potential and is a promising alternative energy resource. A series of experiments in a constant volume combustion bomb are carried out to investigate the effects of turbulence and diffusional–thermal (DT) instability on a hydrogen‐rich syngas turbulent premixed flame. The flow field in the constant volume combustion bomb is calibrated, and the turbulent flow field's homogeneity and isotropy were investigated. The effects of different speeds of fan (1366–4273 rpm), hydrogen fractions (55%–95%), pressures (1.0–3.0 bar), and equivalence ratios (0.6–1.0) on the hydrogen‐rich syngas turbulent premixed flame are studied. According to the analyses, the flow field in the experimental device exhibits good homogeneous and isotropic characteristics. With the increase of turbulence intensity, equivalence ratio, hydrogen fraction, or pressure, the turbulent flame propagation speed increases gradually. As the hydrogen fraction increases or the equivalence ratio decreases, the effective Lewis number decreases, and the effect of DT instability on the flame increases. The research in this article is crucial for the clean and efficient utilization of hydrogen‐rich syngas and the design of related burners.

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Hydrogen Laminar Flames

Lapenna

Berger

Creta

et al. 2023

Hydrogen for Future Thermal Engines

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Propagation of premixed flames in the presence of Darrieus–Landau and thermal diffusive instabilities

Cited by 54 publications

References 58 publications

Data-driven subfilter modelling of thermo-diffusively unstable hydrogen–air premixed flames

Data-driven subfilter modelling of thermo-diffusively unstable hydrogen–air premixed flames

Effect of Turbulence and Diffusional–Thermal Instability on Hydrogen‐Rich Syngas Turbulent Premixed Flame

Hydrogen Laminar Flames

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