Sub-grid scale combustion models for large eddy simulation of unsteady premixed flame propagation around obstacles

Sarli, Valeria Di; Benedetto, Almerinda Di; Russo, G.

doi:10.1016/j.jhazmat.2010.03.006

Cited by 90 publications

(47 citation statements)

References 34 publications

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“…Rate of increase of pressure is defined by the speed of explosive combustion. Many experimental works [7][8][9][10][11] and works in which this process numerically is modelled [12][13][14][15][16] are devoted to studying of this question. At explosion in closed volume terminal pressure of explosion is defined by a share of the burned-down substance.…”

Section: Methodsmentioning

confidence: 99%

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Ensuring explosion safety of residential buildings

Gorev

2018

MATEC Web Conf.

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Abstract. Explosions of air -and-gas mixtures in residential buildingsincident dangerous and recently extended. Unlike the production explosive buildings residential buildings are not protected by express requirements. In this work the possibility of protection of these buildings by means of a depressurization through the coming-off apertures is analyzed. These apertures can be closed by windows or express light-weight constructions. In work it is shown that fastenings of these designs in an aperture considerably are reduced by effectiveness of opening of apertures as the incipient state of driving of protective designs does not open space for venting of gases. Explosion pressure at the same time grows as in closed volume and until opening can reach critical value and cause destruction of the protecting and load-bearing frames. By the time of opening of an aperture for venting of gases the Safety design already has sufficient speed, and discovery of the area in that case happens quickly and pressure increases slightly. The main pressure boost happens before destruction of fastening of mild designs and at their driving in an aperture when volume can be considered pressure-tight. Calculations show: that designs with the specific surface density р30 kg/m2 and depth of seal of 0,2 m do not provide protection of residential buildings. The modern windows to double-glazed windows and their fastening are close to these conditions.

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Section: Methodsmentioning

confidence: 99%

“…is defined from a condition (9). At the decision (10) was considered that there is a constant 0 1 2 T P P    -an average arithmetic value that for mild Safety designs is acceptable.…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Ensuring explosion safety of residential buildings

Gorev

2018

MATEC Web Conf.

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“…Flame propagation in industrial processes that are built from many different constructions can be complex. For example, obstacles in the processes can enhance flame acceleration (Di Sarli et al, 2010;Di Sarli and Di Benedetto, 2013;Kindracki et al, 2007;Park et al, 2008;Silvestrini et al, 2008). Explosions in pipes with a single bend, a U bend, or a Z bend are also quite different than explosions in straight pipes (Blanchard et al, 2010;Frolov et al, 2007;Zhu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Flame acceleration in pipes containing bends of different angles

Zhu

Gao

Lin

et al. 2016

Journal of Loss Prevention in the Process Industries

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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%

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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Sub-grid scale combustion models for large eddy simulation of unsteady premixed flame propagation around obstacles

Cited by 90 publications

References 34 publications

Ensuring explosion safety of residential buildings

Ensuring explosion safety of residential buildings

Flame acceleration in pipes containing bends of different angles

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

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Sub-grid scale combustion models for large eddy simulation of unsteady premixed flame propagation around obstacles

Cited by 90 publications

References 34 publications

Ensuring explosion safety of residential buildings

Ensuring explosion safety of residential buildings

Flame acceleration in pipes containing bends of different angles

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

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Product

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About

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