Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles

Gubba, Sreenivasa Rao; Ibrahim, Salah S.; Malalasekera, Weeratunge; Masri, Assaad R.

doi:10.1016/j.combustflame.2011.05.008

Cited by 54 publications

(32 citation statements)

References 26 publications

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“…However, the practical use of hydrogen-methane blends is yet limited. This is due to a lack in the knowledge about the mechanisms of dynamic interaction between hydrogen-enriched flames and turbulent flow fields [12], which control premixed flame propagation in combustors, industrial burners and engines [see, e.g., [13][14][15][16][17] as well as in gas explosions [see, e.g., 18,19].…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

Sarli

Benedetto

Long

et al. 2012

International Journal of Hydrogen Energy

129

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Additional Information:• NOTICE: this is the author's version of a work that was accepted for publication in the International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was sub- Regardless of the mixture stoichiometry, the hydrogen substitution to methane leads to a transition from a regime in which the vortex only wrinkles the flame front (x H2 < 0.2) to a * Corresponding author. Phone: +39 0817622673; Fax: +39 0817622915; E-mail address: valeria.disarli@irc.cnr.it 3 more vigorous regime in which the interaction almost results in the separation of small flame pockets from the main front (x H2 > 0.2). This transition was characterised in terms of time histories of flame surface area and burning rate.

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Section: Introductionmentioning

confidence: 99%

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

Sarli

Benedetto

Long

et al. 2012

International Journal of Hydrogen Energy

129

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“…1 (left). The influence of the number and position of the obstructions is not discussed here but can be found elsewhere [6]. Experimental measurements recently published by Alharbi et al [5] are used for validation of LES simulations.…”

Section: Experimental Test Casementioning

confidence: 99%

LES-DFSD Modelling of Turbulent Premixed Flames Past Repeated Obstacles

Li¹,

Malalasekera²,

Ibrahim³

2018

Proceedings of the 3rd World Congress on Momentum, Heat and Mass Transfer

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This paper presents simulations of propagating turbulent premixed deflagrating flames past built-in solid obstructions in a small-scale combustion chamber. The design of the chamber allows for up to three baffle plates and a central square obstacle to be positioned in the path of the propagating flames in order to generate turbulence and increase the flame propagating speed. The test case considered in this paper uses a stagnant, stoichiometric propane-air mixture in the configuration of three baffles and one central obstacle. Simulations have been carried out with the Large Eddy Simulation (LES) technique. The filtered reaction rate in LES is accounted for using a novel dynamic flame surface density (DFSD) model. Both numerical and experimental results show that the flame is initially laminar and becomes fully turbulent after continuous interaction with the obstacles downstream. Satisfactory agreement made between the LES calculations and the experimental data confirms the capability of the DFSD model in reproducing essential flame characteristic parameters including the maximum overpressure and flame front speed. The interaction between obstaclegenerated turbulence and the flame front is quantified using the sub-grid-scale (SGS) wrinkling factor. Various stages of flame propagation and the dynamic behaviours of the flame are also examined based on the evolution and spatial distribution of the wrinkling factor.

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“…Flow field and reaction rate were also studied by numerical simulation [17][18][19][20][21][22]. However, most studies focused on methane/air premixed flame propagation in a closed duct.…”

Section: Introductionmentioning

confidence: 99%

“…Lots of experimental and numerical investigations of flame vortexes induced by obstacle aimed at explaining the mechanisms responsible for its formation [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], including the experiment study on acceleration of flame front [12,15], overpressure [9,10,13,14,16], influence of blockage ratio [16], and obstacle shapes [9]. Flow field and reaction rate were also studied by numerical simulation [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Premixed CH₄-Air Flame Structure Characteristic and Flow Behavior Induced by Obstacle in an Open Duct

Chen

Zhang

et al. 2014

Advances in Mechanical Engineering

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To study the fuel gas combustion hazards, the methane/air flame structure and flow characteristic in an open duct influenced by a rectangular obstacle were explored by experiment and realizable -model (RKE). In the test, the high-speed schlieren photography technology and dynamic detection technology were applied to record the flame propagation behavior. Meanwhile, the interaction between flame front and flame flow field induced by the obstacle was disclosed. In addition, the laminar-turbulence transition was also taken into consideration. The RKE and eddy dissipation concept (EDC) premixed combustion model were applied to obtain an insight into the phenomenon of flow change and wrinkle appearing, which potently explained the experimental observations. As a result, the obstacle blocked the laminar flame propagation velocity and increased pressure a little in an open duct. Some small-scale vortices began to appear near the obstacle, mainly due to Kelvin-Helmholtz instability (KHI), and gradually grew into large-scale vortices, which led to laminar-turbulent transition directly. The vortices thickened the reaction area and hastened the reaction rate; reversely, the higher reaction rate induced larger vortices. The RKE model result fitted the test data well and explained the wrinkle forming mechanism of two special vortices in the case.

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Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles

Cited by 54 publications

References 26 publications

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

LES-DFSD Modelling of Turbulent Premixed Flames Past Repeated Obstacles

Premixed CH₄-Air Flame Structure Characteristic and Flow Behavior Induced by Obstacle in an Open Duct

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Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles

Cited by 54 publications

References 26 publications

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

LES-DFSD Modelling of Turbulent Premixed Flames Past Repeated Obstacles

Premixed CH4-Air Flame Structure Characteristic and Flow Behavior Induced by Obstacle in an Open Duct

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Premixed CH₄-Air Flame Structure Characteristic and Flow Behavior Induced by Obstacle in an Open Duct