Validation and recommendations for FLACS CFD and engineering approaches to model hydrogen vented explosions: Effects of concentration, obstruction vent area and ignition position

Vyazmina, Elena; Jallais, Simon

doi:10.1016/j.ijhydene.2016.05.189

Cited by 87 publications

(21 citation statements)

References 5 publications

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“…Interface Flame (SIF) model, while for fire simulation, Eddy Dissipation Concept (EDC) is recommended. The SIF model, which was commonly used in vented or highly confined gas explosion studies (Bleyer et al, 2012;Vyazmina and Jallais, 2016), was employed in this study. SIF model solves compressible flows by modelling flame as an interface to ensure good representation of flame area in a coarse grid.…”

Section: Cfd Simulation and Validationmentioning

confidence: 99%

Experimental and computational Fluid Dynamics study of separation gap effect on gas explosion mitigation for methane storage tanks

Hao

Shi

et al. 2018

Journal of Loss Prevention in the Process Industries

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This paper presented both experimental and numerical assessments of separation gap effect on vented explosion pressure in and around the area of a tank group. A series of vented gas explosion layouts with different separation gaps between tanks were experimentally investigated. In order to qualitatively determine the relationship between the separation gap distance and explosion pressure, intensive computational Fluid Dynamics (CFD) simulations, verified with testing data, were conducted. Good agreement between CFD simulation results and experimental data was achieved. By using CFD simulation, more gas explosion cases were included to consider different gas cloud coverage scenarios. Separation gap effects on internal and external pressures at various locations were investigated.

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Section: Cfd Simulation and Validationmentioning

confidence: 99%

Experimental and computational Fluid Dynamics study of separation gap effect on gas explosion mitigation for methane storage tanks

Hao

Shi

et al. 2018

Journal of Loss Prevention in the Process Industries

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“…FLACS software is a simulation tool developed based on CFD (computational fluid dynamics) technology, which effectively predicts the overpressure characteristics of gas explosion accidents. Vyazmina et al researched effects of concentration, obstruction vent area, and ignition position on hydrogen vented explosions, and the simulation results are compared with the recent published experimental results to verify the feasibility of the software and provide suggestions for the application of the engineering model and FLACS [30]. Angers et al utilized FALCS software to model hydrogen explosion characteristics on a pressure swing adsorption device [31].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Characteristics of Gas Explosion Process in Natural Gas Compartment of Utility Tunnel Using FLACS

et al. 2019

Sustainability

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With the rapid urbanization in China, directly buried municipal pipelines have been gradually replaced by urban utility tunnels due to a serious shortage of urban underground spaces and weak disaster prevention of traditional municipal pipelines. The urban utility tunnels normally contain electricity pipelines, natural gas pipelines, heat pipelines, sewer pipelines, etc. If a natural gas pipeline leaks, a fire and explosion might occur and lead to serious consequences. In this study, the characteristics of gas explosion in a natural gas compartment of urban utility tunnel are investigated based on FLACS (Flame Acceleration Simulator) simulations. The results revealed that the flame profile undergoes two unstable flame stages. When the ignition position is set at the middle area (100.25, 1.2, 1.4 m) of the 200 m-long natural gas compartment, the maximum overpressure of the gas explosion in the 200 m-long natural gas compartment is 25.17 bar, which is the largest maximum overpressure under all gas explosion simulation setups. It is also found that the length of the natural gas compartment and different ignition positions have slight effects on the maximum overpressure. This study could provide technical support for structural strength design and division of the fireproofing area of the natural gas compartment in the utility tunnel, which is of great significance to improve urban safety during sustainable development.

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“…The main parameters to measure the characteristics of a gas explosion are flame propagation velocity, flame temperature, explosion pressure, and a rising rate of explosion pressure. Comprehensive national and international research has been reported on the characteristics of gas explosion . In the early 1980s, Richmond and Lebman have carried out an experimental study on the flame propagation process of gas explosion in a full‐scale simulated coal mine roadway, to effectively prevent and control gas explosion accidents in coal mines.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of low‐concentration gas explosion in large‐scale pipeline

Zhang

Liu

et al. 2020

Energy Science & Engineering

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Low‐concentration gas is one of the most realistic and reliable supplementary or alternative energy sources of conventional natural gas, which has a wide range of applications. However, this gas is flammable and explosive during pipeline transportation and easily causes an explosion. In order to achieve safe transmission, the explosion characteristics and propagation law of low‐concentration gas are systematically studied through a large‐scale pipeline experimental system. We found that the peak pressure of low‐concentration gas explosion in pipeline has a quadratic function relationship with the propagation distance. Moreover, the peak pressure of gas explosion initially decreases from the explosion source, and then a turning point appears after a certain distance of propagation, which is followed by a sharp increase of peak pressure of gas explosion. The explosion pressure becomes maximum at the outlets of a pipeline. The arrival time of explosion flame is logarithmically relevant to propagation distance, while the speed of flame propagation gradually increases along with the increase of propagation distance. The flame propagation is faster at the exit point. In addition, the diameter of pipeline has also an important influence on the explosion propagation process of low‐concentration gas. So, the larger the diameter, the higher the explosion pressure. The explosion pressure of DN700 pipeline is obviously higher than that of DN500, and the explosion pressure rises faster; the speed of flame propagation of gas explosion in DN700 pipeline is also higher than that in DN500 pipeline. This study provides a theoretical reference for the prevention and control of explosion accidents in low‐concentration gas pipelines.

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Validation and recommendations for FLACS CFD and engineering approaches to model hydrogen vented explosions: Effects of concentration, obstruction vent area and ignition position

Cited by 87 publications

References 5 publications

Experimental and computational Fluid Dynamics study of separation gap effect on gas explosion mitigation for methane storage tanks

Experimental and computational Fluid Dynamics study of separation gap effect on gas explosion mitigation for methane storage tanks

Numerical Analysis of the Characteristics of Gas Explosion Process in Natural Gas Compartment of Utility Tunnel Using FLACS

Experimental study of low‐concentration gas explosion in large‐scale pipeline

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