Large eddy simulation of hydrogen–air premixed flames in a small scale combustion chamber

Abdel-Raheem, Mohamed A.; Ibrahim, Salah S.; Malalasekera, Weeratunge; Masri, Assaad R.

doi:10.1016/j.ijhydene.2014.12.042

Cited by 34 publications

(13 citation statements)

References 52 publications

(37 reference statements)

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“…Here, calculations are initialized by a small hemisphere of burnt gases (radius 1 cm) at the ignition point. This model is acceptable here since it mainly impacts the time to reach the peak pressure (a quantity which we are not interested in, see Section 2 ) and not the mag-nitude of the peak pressure itself [45] . Furthermore it matches well the real conditions of ignition: since the flow is at rest initially, assuming that the flame will still be laminar and hemispherical when it reaches a 1 cm radius is reasonable.…”

Section: Numerical Setupmentioning

confidence: 99%

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LES of explosions in venting chamber: A test case for premixed turbulent combustion models

Vermorel

Quillatre

Poinsot

2017

Combustion and Flame

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This paper presents a new experimental and Large Eddy Simulation (LES) database to study upscaling effects in vented gas explosions. The propagation of premixed flames in three setups of increasing size is investigated experimentally and numerically. The baseline model is the well-known laboratory-scale combustion chamber from Sydney (Kent et al., 2005; Masri et al., 2012); two exact replicas at scales 6 and 24.4 were set up by GexCon (Bergen, Norway). The volume ratio of the three setups varies from 1 to more than 10,0 0 0, a variation unseen in previous experiments, allowing the exploration of a large range of Reynolds and Damköhler numbers. LES of gaseous fully premixed flames have been performed on the three configurations, under different operating conditions, varying the number of obstacles in the chamber, their position and the type of fuel (hydrogen, propane and methane). Particular attention is paid to the influence of the turbulent combustion model on the results (overpressure, flame front speed) comparing two different algebraic sub-grid scale models, the closures of Colin et al. (20 0 0) and Charlette et al. (2002), used in conjunction with a thickened flame approach. Mesh dependency is checked by performing a highly resolved LES on the small-scale case. For a given scale and with a fixed model constant, LES results agree with experimental results, for all geometric arrangement of the obstacles and all fuels. However, when switching from small-scale cases to medium-scale or large-scale cases this conclusion does not hold, illustrating one of the main deficiencies of these algebraic models, namely the need for an a priori fitting of the model parameters. Although this database was initially designed for safety studies, it is also a difficult test for turbulent combustion models.

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Section: Numerical Setupmentioning

confidence: 99%

“…It was found that the LES predictions are slightly improved by the use of the dynamic procedure [42,44] . In [45] , this work was extended to a lean hydrogen-air mixture. Accurate predictions of the flame shape and peak overpressure were again obtained for different numbers and locations of obstacles.…”

Section: Introductionmentioning

confidence: 99%

LES of explosions in venting chamber: A test case for premixed turbulent combustion models

Vermorel

Quillatre

Poinsot

2017

Combustion and Flame

View full text Add to dashboard Cite

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“…More obstacles resulting in a higher blockage ratio give rise to more pronounced turbulence and a faster flame [8]. It can be explained by an increased number of vortical structures in the flow.…”

Section: Introductionmentioning

confidence: 99%

“…The simulations were performed using OpenFOAM and flameFoam-a custom open source computational fluid dynamics (CFD) solver developed by the authors for the simulation of premixed turbulent combustion in hydrogen-air mixtures. There are simulations of combustion in vented small-scale chambers published in the literature with turbulence modelled according to the Large Eddy Simulation (LES) approach [8][9][10][11][12]. Furthermore, mentioned research papers investigates sensitivity to the ignition source [8], comparison of mixtures [9,12], analysis of the equivalence ratio effect [11] and different configurations of baffles [9,10,12].…”

Section: Introductionmentioning

confidence: 99%

“…There are simulations of combustion in vented small-scale chambers published in the literature with turbulence modelled according to the Large Eddy Simulation (LES) approach [8][9][10][11][12]. Furthermore, mentioned research papers investigates sensitivity to the ignition source [8], comparison of mixtures [9,12], analysis of the equivalence ratio effect [11] and different configurations of baffles [9,10,12]. Most of them show flame front structure.…”

Section: Introductionmentioning

confidence: 99%

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RANS- and TFC-Based Simulation of Turbulent Combustion in a Small-Scale Venting Chamber

2021

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A laboratory-scale chamber is convenient for combustion scenarios in the practical analysis of industrial explosions and devices such as internal combustion engines. The safety risks in hazardous areas can be assessed and managed during accidents. Increased hydrogen usage in renewable energy production requires increased attention to the safety issues since hydrogen produces higher explosion overpressures and flame speed and can cause more damage than methane or propane. This paper reports numerical simulation of turbulent hydrogen combustion and flame propagation in the University of Sydney's small-scale combustion chamber. It is used for the investigation of turbulent premixed propagating flame interaction with several solid obstacles. Obstructions in the direction of flow cause a complex flame front interaction with the turbulence generated ahead of it. For numerical analysis, OpenFOAM CFD software was chosen, and a custom-built turbulent combustion solver based on the progress variable model—flameFoam—was used. Numerical results for validation purposes show that the pressure behaviour and flame propagation obtained using RANS and TFC models were well reproduced. The interaction between larger-scale flow features and flame dynamics was obtained corresponding to the experimental or mode detailed LES modelling results from the literature. The analysis revealed that as the propagating flame reached and interacted with obstacles and the recirculation wake was created behind solid obstacles, leaving traces of an unburned mixture. The expansion of flames due to narrow vents generates turbulent eddies, which cause wrinkling of the flame front.

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Simulating of non-premixed turbulent combustion using a presumed probability density function method

et al. 2022

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Large eddy simulation of hydrogen–air premixed flames in a small scale combustion chamber

Cited by 34 publications

References 52 publications

LES of explosions in venting chamber: A test case for premixed turbulent combustion models

LES of explosions in venting chamber: A test case for premixed turbulent combustion models

RANS- and TFC-Based Simulation of Turbulent Combustion in a Small-Scale Venting Chamber

Simulating of non-premixed turbulent combustion using a presumed probability density function method

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