Effects of cross-wise obstacle position on methane–air deflagration characteristics

Wen, Xiaoping; Yu, Minggao; Liu, Zhichao; Guo, Li; Ji, Wentao; Xie, Maozhao

doi:10.1016/j.jlp.2013.08.006

Cited by 50 publications

(16 citation statements)

References 19 publications

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“…In the past few decades, an increasing number of scholars have used experimental and numerical methods to carry out a large number of studies on large-scale confined spaces with built-in congestion gas explosions and explosion venting effects [6]. Moen et al [7] used a 50 m 3 circular pipe to study the effects of the area blocking rate and amount of orifice congestion on the explosion venting of a methane/air mixture.…”

Section: Introductionmentioning

confidence: 99%

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Pang

Jin

et al. 2021

Advances in Civil Engineering

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The process of gas explosion venting in a typical Chinese civil kitchen was investigated using computational fluid dynamics technology, focusing on the impact of the scale and cross-sectional characteristics of congestion, such as common furniture and electrical appliances, on the explosion flow-field parameters. An asymmetrical distribution of congestion will cause the uneven combustion of explosion flames in the kitchen. The flame will initially spread on one side of the room and then accelerate toward the surrounding areas, thereby increasing the risk of indoor gas explosion. The typical indoor overpressure change process can be divided into five stages, among which Stage V is found to be related to pseudoclosed combustion. Large-scale congestion has an obstructive effect on the explosion flow field, but it changes under certain conditions, while small-scale congestion only acts as a promoter. The flat congestion cross section helps maintain the stability of the flame structure, whereas the continuous and abrupt change of the congestion cross section can induce strong turbulent combustion. The research results provide a theoretical basis for the prevention and control of natural gas explosion hazards in civil kitchens from the perspective of congestion scale and cross-sectional mutation.

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Section: Introductionmentioning

confidence: 99%

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Pang

Jin

et al. 2021

Advances in Civil Engineering

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“…The maximum explosion characteristics (overpressure, turbulence intensity and flame propagation speed) were achieved for triangular profile. Wen et al [22]studied the effect of various cross-wise orientations for three obstacle arrangements in vented chamber on deflagration behavior. For the configuration of three centrally located obstacles, deflagration dynamics expressed in flame speed and overpressure achieved the highest values, in which flame velocity speeds up to 82 m/s, whereas the lowest flame velocity is reported at 42 m/s for the configuration with three obstacles mounted on one side of the chamber.…”

Section: Introductionmentioning

confidence: 99%

LES Analysis of Equivalence Ratio Effect on Turbulent Premixed Characteristics of LPG Flame Front Propagation

Yehia

Abdel-Aziz

Hassan

et al. 2020

The Egyptian International Journal of Engineering Sciences and

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“…However, largescale experiments with built-in solid obstacles are very hard to explore the deflagration mechanism due to the difficulty of conducting detailed measurements [9,10]. Using advantaged test technology of laser diagnostic, some lab-scale experiments [11][12][13][14][15][16] were performed to investigate the mechanism of deflagration in complex geometries and short periods. By performing the deflagration test [13] in a vented chamber with solid obstacles varying in numbers and locations, it was concluded that obstacles had significant impacts on the overpressure effect and flame structure.…”

Section: Introductionmentioning

confidence: 99%

“…By performing the deflagration test [13] in a vented chamber with solid obstacles varying in numbers and locations, it was concluded that obstacles had significant impacts on the overpressure effect and flame structure. Deflagration experiment on the flame-obstacle interactions was conducted [14] by considering three different obstacle configurations, i.e., side, central, and staggered, respectively. A comprehensive experimental study of natural gas combustion in a stainless steel cylinder vessel (diameter 180 mm and height 210 mm) was conducted by Tang, Zhang et al [17] to investigate the influence of the initial conditions such as equivalence ratios, pressures, and temperatures, as well as monitoring the peak overpressures to provide fundamental data for natural gas engine timing control.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation on Deflagration of LNG Spill

Sun

Guo

Pareek

2019

Journal of Combustion

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The deflagration characteristics of premixed LNG vapour-air mixtures with different mixing ratios were quantitatively and qualitatively investigated by using CFD (computational fluid dynamics) method. The CFD model was initially established based on theoretical analysis and then validated by a lab-scale deflagration experiment. The flame propagation behaviour, pressure-time history, and flame speed were compared with the experimental data, upon which a good agreement was achieved. A large-scale deflagration fire during LNG bunkering process was conducted using the model to investigate the flame development and overpressure effects. Mesh independence and time scale were tested in order to obtain the suitable grid resolution and time step. Deflagration cases with two different LNG vapour volume fractions, i.e., 10.4% and 15.0%, were simulated and compared. The one with a volume fraction of 10.4% which was around stoichiometric mixing ratio had the highest flame propagating speed. High flame velocity observed in the simulation was coupled with the thin flame front where overpressure occurred. The CFD model could capture the main features of deflagration combustion and account for LNG fire hazard which could provide an in-depth insight when dealing with complicated cases.

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Effects of cross-wise obstacle position on methane–air deflagration characteristics

Cited by 50 publications

References 19 publications

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

LES Analysis of Equivalence Ratio Effect on Turbulent Premixed Characteristics of LPG Flame Front Propagation

Dynamic Simulation on Deflagration of LNG Spill

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