Effects of gas concentration and obstacle location on overpressure and flame propagation characteristics of hydrocarbon fuel-air explosion in a semi-confined pipe

Li, Guoqing; Wang, Shimao; Bai, Jie; Wu, Di; Qi, Sheng

doi:10.1016/j.fuel.2020.119268

Cited by 21 publications

(3 citation statements)

References 55 publications

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“…2 . Meanwhile, the obstacle located in the center of the premixing area could bring a higher explosion intensity, and it also easier to reflect the differences between the blocking conditions 9 . Therefore, the crushed gangue blockage ratio was set to 75%, the accumulation void fraction was set to 0.55, which was measured by the drainage method.…”

Section: Experimental Setup and Processmentioning

confidence: 99%

Study on the propagation characteristics of methane-air explosion under the promotion of crushed gangue

Liu,

Zhong,

2024

Sci Rep

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Methane-air explosion is one of the major disasters in industrial process. The explosion strength could be influenced by the crushed coal gangue, which is widely distributed in coal mine gob and roadway. To understand the influence of the coal gangue on gas explosion, an experimental system with a 0.2 × 0.2 × 3.0 m3 pipeline was designed and explosion experiments of coal gangue with 5 blockage length-diameter ratios (ratio of axial blockage length to pipeline equivalent diameter) were carried out. The results show that coal gangue can cause significant disturbances to the flame front, resulting in a violent acceleration of the explosion flame. The overpressure ratio presents a negative exponential function distribution with the blockage length-diameter ratio. The influence range increases with the blockage length-diameter ratio under the condition of rich fuel, and reaches the maximum when equivalent ratio is 1.237. The explosion intensity is more sensitive to the blockage length-diameter ratio for the equivalent ratio equals 1.0 and 1.237. The formation of high-intensity explosion should be avoided by controlling the accumulation state of the overlying rock in coal mining.

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Section: Experimental Setup and Processmentioning

confidence: 99%

Study on the propagation characteristics of methane-air explosion under the promotion of crushed gangue

Liu,

Zhong,

2024

Sci Rep

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“…These obstacles, with different geometries, positions [5,6], blocking probability [7,8] and numbers of obstacles [9], all have different effects on the combustion and explosion of premixed gas. The research on this problem was mostly carried out through experiments [10,11] or simulations [12,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Premixed Methane–Air Explosion in a Closed Tube with U-Type Obstacles

et al. 2022

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Given the spatial structures and functional requirements, there are a number of different types of obstacles in long and narrow confined spaces that will cause a premixed gas explosion to produce greater overpressure and influence the flame behavior for different obstacles. Because the volume fraction of unburned gas changes with the changing height of the U-type obstacles, we can further study the influence on the volume fraction of the unburned premixed gas for the characteristics of the overpressure and the flame behaviors in the closed tube with the obstacles. The results show that after the premixed gas is successfully ignited in the pipe, the overpressure in the pipe greatly increases as the unburned premixed gas burns between the adjacent plates. Moreover, the increase of the overpressure in the closed duct becomes faster when the decrease of unburned gas becomes faster. The high-pressure areas between the plates move inversely compared with the direction of flame propagation when the height of the U-type increases, whereas the high pressure in the front of the flame moves further when the flame propagation passes all obstacles. In addition, the reversed flow structure of the flame is a coupling result for the overpressure caused by the flame propagation and the vortex between the plates. From the perspective of production safety, this study is a significant basic subject about the characteristics of overpressure and flame behaviors in a closed tube with obstacles.

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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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Effects of gas concentration and obstacle location on overpressure and flame propagation characteristics of hydrocarbon fuel-air explosion in a semi-confined pipe

Cited by 21 publications

References 55 publications

Study on the propagation characteristics of methane-air explosion under the promotion of crushed gangue

Study on the propagation characteristics of methane-air explosion under the promotion of crushed gangue

Numerical Simulation of Premixed Methane–Air Explosion in a Closed Tube with U-Type Obstacles

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

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