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

Li, Jingde; Hao, Hong; Shi, Yanchao; Fang, Qin; Li, Zhan; Chen, Li

doi:10.1016/j.jlp.2018.07.008

Cited by 27 publications

(6 citation statements)

References 27 publications

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“…Additionally, it can also be observed that the P ex in FLACs increases as early as 0.71 ms. According to Li et al(Li et al, 2018), this phenomena occurred due to the high initial burning rate of flame in FLACs simulation which was also reported by Ma et al (2014) and Pedersen and Middha (2012).…”

Section: Methodssupporting

confidence: 66%

Numerical Simulation on the Effect of Concentration on Premixed Ch4/Co2/Air Explosion Characteristics

Khan¹,

Sulaiman²,

Izhab³

et al. 2019

JCEIB

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In this study, a numerical simulation on the premixed CH4/CO2/Air (methane/carbon dioxide/air) mixture explosion characteristics was conducted by using the Flame Acceleration Simulator (FLACs) software. The domain used in the 20 L spherical vessel with 0.808 m diameter. The effect of various equivalence ratios on the explosion characteristics such as the explosion pressure, Pex, maximum explosion overpressure, Pmax, the maximum rate of the pressure rise, (dP/dt)max and gas deflagration index, KG, were studied. For this purpose, the mixture concentrations range from equivalence ratio (ER) 0.8 to 1.5 (9.6 to 18% vol/vol) were considered. From this study, the explosion pressure, Pex, maximum explosion overpressure, Pmax, and the maximum rate of pressure rise, (dP/dt)max, at various ER was the maximum at a slightly rich concentration (ER=1.2). At lean and rich mixtures, the Pex, Pmax, (dP/dt)max and KG decreases. It can be said that, at ER=1.2, the role of thermal-diffusive instability and its effect on the flame speed during the pressure development process had causes the diffused methane, CH4, to react further into the flame front, which significantly increases the mixture mass burning rate and flame was also found to propagates the fastest at ER=1.2 due to the incompletecombustion process caused by the insufficient and excess CH4 present in the lean and rich mixtures. The CH4/CO2/air mixtures studied in this study were also found to have the highest level of hazard potential when exploded.

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Section: Methodssupporting

confidence: 66%

Numerical Simulation on the Effect of Concentration on Premixed Ch4/Co2/Air Explosion Characteristics

Khan¹,

Sulaiman²,

Izhab³

et al. 2019

JCEIB

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“…Also, they calculated the resulting pressure and deformation. Lee et al [26,27] examined the blast pressure inside and outside the space of the water tanks. They presented the calculation procedure for the internal and external pressures in the water tanks.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Reinforced Concrete Water Tanks under Blast Considering Fluid-Structure Interaction

Moghadam,

Razavitosee,

Sharbanozadeh

2022

Scientia Iranica

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This study investigates the blast effect on hoop stresses and displacements created on the wall of over-ground cylindrical reinforced concrete water tanks and the effect of blast waves, fluid surface motion, and the surface tension of water due to water-structure interaction using ABAQUS software. Three water tanks with heights of 4, 6, and 8 m and a fixed radius of 3 m were used for simulation, each of which was filled with 0, 25, 50, 75, and 100% water from the depth of the tank. The results revealed that the above parameters affect the water tank structure's dynamic response so that the surface tension of water is higher in water tanks with 50% water filling. Also, increasing the water filling percentage, the hardness of the water tank increased and decreased the tank wall displacement by 31.25% for a filled water tank compared to an empty water tank. The results illustratd that the water tank wall's hoop stresses were affected by blast waves from the outside and water tension from the inside, so that the water tension in the water tank caused an approximate 20 MPa increase in the hoop stresses on the wall.

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“…Li et al assessed effects on vented explosion pressure in and around the area of a tank group. For their research, they designed a series of tank layouts with different separation gaps [20,21] and calculated the internal and external pressures subjected to different separation gaps. ey also proposed equations for calculating the tank's pressure-time history duration and shape.…”

Section: Introductionmentioning

confidence: 99%

Behaviors of Thin‐Walled Cylindrical Shell Storage Tank under Blast Impacts

Wang

Chen

et al. 2019

Shock and Vibration

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Large steel storage tanks designed with long-span structures, employed for storing oil and fuel, have been widely used in many countries over the past twenty years. Most of these tanks are thin-walled cylindrical shells. Owing to the high risk of gas explosions and the resulting deaths, injuries, and economic losses, more thorough damage analyses of these large structures should be conducted. This study examines the structural response of a simplified steel storage tank under a blast impact, as calculated by the LS-DYNA software package. The numerical results are then compared with a scale-model experiment. On that basis, the simplified storage tank prototype, which has a 15 × 104 m3 capacity, is analyzed using numerical simulation. In this study, we address issues around the variation in structural responses—particularly of the failure mode, resultant displacement, structural energy, and dynamic strain under the impact. In addition, we also discuss the effects of varying the internal liquid level, constraint conditions, and blast intensity.

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

Cited by 27 publications

References 27 publications

Numerical Simulation on the Effect of Concentration on Premixed Ch4/Co2/Air Explosion Characteristics

Numerical Simulation on the Effect of Concentration on Premixed Ch4/Co2/Air Explosion Characteristics

Dynamic Analysis of Reinforced Concrete Water Tanks under Blast Considering Fluid-Structure Interaction

Behaviors of Thin‐Walled Cylindrical Shell Storage Tank under Blast Impacts

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