Influence of built-in obstacles on unconfined vapor cloud explosion

Liu, Dong; Zhang, Qi; Ma, Qiuju; Shen, Shilei; Chen, Jiachen; Ren, Shaoyun

doi:10.1016/j.jlp.2016.07.007

Cited by 11 publications

(3 citation statements)

References 20 publications

(18 reference statements)

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“…erefore, the peak combustion rate is low before reaching the refrigerator, and its arrival time increases linearly. e pressure gradient formed on the surface of the refrigerator hinders the expansion of the hot burning gas and causes the accumulation of energy, which leads to a slight increase in local overpressure [32,33]. With the expansion of the burning gas (280-300 ms), the unburned gas in front of the flame is forced to flow from the passage between the refrigerator and row wall cabinet.…”

Section: Characteristics Of Overpressure Formation and Flamementioning

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: Characteristics Of Overpressure Formation and Flamementioning

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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“…Therefore, the overpressure due to VCE decreases from stoichiometric concentration (9.5% by volume) to high methane-air concentration (15% by volume) [58]. In addition, a flammable vapour cloud encountering more obstacles could lead to development of turbulent flow regimes, resulting in expanding the flame surface, which may lead to higher combustion rate and hence higher overpressure [60][61][62]. Figure 11 displays the concentration profile of methane-air mixture and overpressure developed due to VCE at low and high wind speeds and 31 kg/s leak rate for leak direction RX+.…”

Section: Effect Of Wind and Leakage Conditions On Human Fatality Risk...mentioning

confidence: 99%

Investigating Vapour Cloud Explosion Dynamic Fatality Risk on Offshore Platforms by Using a Grid-Based Framework

et al. 2020

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The reliability of petroleum offshore platform systems affects human safety and well-being; hence, it should be considered in plant design and operation in order to determine its effect on human fatality risk. Methane Vapour Cloud Explosions (VCE) in offshore platforms are known to be one of the fatal potential accidents that can be attributed to failure in plant safety systems. Traditional Quantitative Risk Analysis (QRA) lacks in providing microlevel risk assessment studies and are unable to update risk with the passage of time. This study proposes a grid-based dynamic risk analysis framework for analysing the effect of VCEs on the risk of human fatality in an offshore platform. Flame Acceleration Simulator (FLACS), which is a Computational Fluid Dynamics (CFD) software, is used to model VCEs, taking into account different wind and leakage conditions. To estimate the dynamic risk, Bayesian Inference (BI) is utilised using Accident Sequence Precursor (ASP) data. The proposed framework offers the advantage of facilitating microlevel risk analysis by utilising a grid-based approach and providing grid-by-grid risk mapping. Increasing the wind speed (from 3 to 7 m/s) resulted in maximum increase of 21% in risk values. Furthermore, the integration of BI with FLACS in the grid-based framework effectively estimates risk as a function of time and space; the dynamic risk analysis revealed up to 68% increase in human fatality risk recorded from year one to year five.

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“…Over the recent years, the explosive characteristics of combustible gas with barriers have been extensively studied experimentally. , These studies focused on the shape, − blockage ratio, − location, − number, − spacing, , and fuel concentration. − Further, experiments have been conducted to obtain the explosive pressure parameters and flame transmission characteristics. The results indicated that the number of barriers can increase the flame propagation speed and peak pressure, but the peak pressure is not entirely determined by the number of barriers.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Perforated Polyethylene Material on Propane–Air Explosion in a Confined Space

Qiao

Long³

2022

ACS Omega

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In this study, the effect of polyethylene barriers with different blockage ratios on the explosion behavior of a propane–air premixed gas in a confined space is investigated. The maximum explosion pressure (P max), the deflagration index (K G), and the flame propagation process of the propane–air premixed gas with different barrier thicknesses are examined by using a horizontal closed tube with a length of 0.5 m and a diameter of 0.1 m and a high-speed camera. The atmospheric pressure and temperature of the premixed gas were 101.3 kPa and 18 °C, respectively. Based on the Canny operator, the position of the flame front at different times and the shape of the barriers before and after the explosion are determined, and the propagation speed of the premixed flame and the deformation rate of the barriers are obtained. The results indicate that the barriers change the flow field structure of the unburned gas and increase the folding degree of the flame front. With the increase in the blockage ratio, the explosion of a premixed system becomes more rapid and violent. Under the action of Rayleigh–Taylor instability, the variation in the flame propagation speed induces a change in the tube pressure. In addition, the deformation of a barrier causes a change in the maximum explosion pressure. The greater the deformation ratio of the barrier after the explosion, the larger the maximum explosion pressure.

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Influence of built-in obstacles on unconfined vapor cloud explosion

Cited by 11 publications

References 20 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

Investigating Vapour Cloud Explosion Dynamic Fatality Risk on Offshore Platforms by Using a Grid-Based Framework

Effect of a Perforated Polyethylene Material on Propane–Air Explosion in a Confined Space

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