Influences of a square and circular vent on gasoline vapor explosions and its propagation: Comparative experimental study

Pan, Chuanyu; Wang, Xishi; Li, Guochun; Liu, Yangpeng; Jiang, Yong

doi:10.1016/j.csite.2021.101225

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…Ma et al 19 studied the influence of venting surface size on the venting characteristics of methane in a container. The influence of the EVS shape on the explosion process was also observed; Pan et al 20 found that the oscillation of flame propagation caused by a circular venting surface was larger than that of a square venting surface. Fakandu et al 21 studied the effects of circular and square vents with the same geometric area on the explosion characteristics of combustible gases.…”

Section: Introductionmentioning

confidence: 99%

Influence of the opening pressure of explosion‐venting surface on methane deflagration characteristics in municipal sewage confined spaces

et al. 2023

Process Safety Progress

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This study investigates the influence of the opening pressure of the explosion‐venting surface (EVS) of a vertical branch pipeline on the deflagration characteristics of methane at different concentrations. The results indicate that the increase in the opening pressure of the EVS promotes the accumulation of deflagration pressure in the horizontal pipeline, whereas the venting effect in the vertical branch pipeline attenuates the peak value of the deflagration pressure. The vertical branch pipeline has both “promoting” and “inhibiting” effects on the flame propagation speed in the horizontal pipeline. With an increase in the methane concentration and opening pressure of the EVS, the promoting effect gradually plays a dominant role, resulting in an increase in the flame propagation speed. In actual industrial production and daily life, in order to avoid explosion hazards, it is essential to install EVSs or reduce their opening pressure in a confined space.

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Section: Introductionmentioning

confidence: 99%

Influence of the opening pressure of explosion‐venting surface on methane deflagration characteristics in municipal sewage confined spaces

et al. 2023

Process Safety Progress

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“…The turbulence intensity also has a great influence on the average pressure rise rate and the maximum pressure rise rate. With the increase of the number of tee branches, the turbulence intensity and pressure rise rates also increase significantly in a pipe. , With common explosion venting, studies include the variation law of pressure fluctuation in the process of explosion venting, the influence of the venting area on explosion pressure, the correlation characteristics between the blockage ratio of the explosion relief port and the peak value of explosion overpressure, and so on. − In connected containers with explosion venting, the maximum pressure rise rate is higher than that of a single container . However, there are rare research results reported on the direction design of explosion venting.…”

Section: Introductionmentioning

confidence: 99%

“… 12 , 16 With common explosion venting, studies include the variation law of pressure fluctuation in the process of explosion venting, the influence of the venting area on explosion pressure, the correlation characteristics between the blockage ratio of the explosion relief port and the peak value of explosion overpressure, and so on. 17 − 19 In connected containers with explosion venting, the maximum pressure rise rate is higher than that of a single container. 20 However, there are rare research results reported on the direction design of explosion venting.…”

Section: Introductionmentioning

confidence: 99%

Effect Analysis of the Venting Direction on Explosion Pressure in LPG Pipelines

Bi,

Cao,

Mao

et al. 2024

ACS Omega

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In order to study the effect of the venting direction on explosion pressure in liquefied petroleum gas pipelines, explosion accident scenarios are experimentally tested and numerically simulated in a pipeline model with different explosion venting directions. In addition, the effect characteristic is analyzed through the pressure field varying with time and peak pressure varying with the distance. Results show that the pressure in the vertical branch decreases sharply, while the pressure in the horizontal branch does not show an obvious decrease with explosion venting of the vertical branch. However, the pressure decreases obviously in both branches with explosion venting of the horizontal branch, and the biggest reduction of peak pressure of monitoring points is 73.55% compared with that without venting. In addition, large areas of negative pressure appear in both branches with explosion venting of the vertical branch; however, a large area of negative pressure area appears in the horizontal branch with explosion venting of the horizontal branch. What is more, the arrival time of peak pressure in the main pipe of the explosion pipeline is significantly reduced with explosion venting, which is caused by the different generation ways of peak pressure. The effect analysis result of the venting direction on explosion pressure could aid the optimal layout design of LPG pipelines with the location of venting and important facilities as well as with the selection of negative-pressure-resistant material and higher-accuracy sensors.

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“… 13 Pan et al studied the explosion experiments of rectangular containers with circular and square vents and found that the amplitude of flame tip propagation oscillations under circular vents was greater than that of the square ones. 14 Qi et al studied the effect of three kinds of vents of 25, 50, and 100 cm 2 on the gasoline vapor–air-premixed explosion characteristics and found that the external pressure of 25 and 50 cm 2 vents increased more significantly than that of the 100 cm 2 vent. 15 Jia et al studied the effect of NaCL-containing ultrafine water mist with different blockage rates of pressure relief ports on the explosion characteristics, and the analysis pointed out that the explosion overpressure was enhanced with the increase of pipe blockage rate.…”

Section: Introductionmentioning

confidence: 99%

“…Yao et al concluded that when the ignition position was the same, the overpressure growth rate and the maximum overpressure decreased as the opening rate increased . Pan et al studied the explosion experiments of rectangular containers with circular and square vents and found that the amplitude of flame tip propagation oscillations under circular vents was greater than that of the square ones . Qi et al studied the effect of three kinds of vents of 25, 50, and 100 cm 2 on the gasoline vapor–air-premixed explosion characteristics and found that the external pressure of 25 and 50 cm 2 vents increased more significantly than that of the 100 cm 2 vent .…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Vent Shape and Blockage Ratio on the Premixed Gas Explosion in the Chamber with a Small Aspect Ratio

et al. 2022

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Given the current situation of deflagration caused by gas leakage for domestic use and the study of the single shape of the vent, the differential change law of vent parameters on the small aspect ratio of the chamber explosion flame evolution and explosion overpressure and other effects were experimentally investigated. Based on the theory of geometric similarity, the experimental platform of a small length–diameter ratio explosion chamber was designed and built, and the premixed gas explosion experiment was carried out by changing the shape (square and rectangle) and blockage ratio (0.1, 0.3, 0.5, 0.7, and 0.9). The explosion flame structure, flame front position, flame propagation speed, explosion pressure waveform, overpressure peak value, and so on were tested and analyzed. The results showed that the blockage ratio had the most significant effect on flame propagation and explosion flame evolution. With the increase of blockage ratio, the stretching degree of the flame became more and more obvious, the flame front became sharper and sharper, and the sharp flame changed from the lower part to the upper part. The position of the flame front increased rapidly, and the steepness and peak value of explosion overpressure became larger. The oscillation of the flame propagation velocity was more violent after the turn, and the speed of propagation to the outside of the chamber gradually accelerated. In the same blockage ratio, there was a difference in the time point at which the flame propagation velocity turned under the rectangular and square shape of the vent. In blockage ratios of 0.1, 0.3, 0.5, and 0.9, the peak overpressure reduction under the shape of the blast square relative to the rectangle was 41.3, 47.9, 1.03, and 27.6%. This indicated that the explosion relief effect of the square was better than that of a rectangle. The research results can provide a reference and basis for the reasonable deployment of explosion venting and explosion decompression work.

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Influences of a square and circular vent on gasoline vapor explosions and its propagation: Comparative experimental study

Cited by 13 publications

References 25 publications

Influence of the opening pressure of explosion‐venting surface on methane deflagration characteristics in municipal sewage confined spaces

Influence of the opening pressure of explosion‐venting surface on methane deflagration characteristics in municipal sewage confined spaces

Effect Analysis of the Venting Direction on Explosion Pressure in LPG Pipelines

Study on the Influence of Vent Shape and Blockage Ratio on the Premixed Gas Explosion in the Chamber with a Small Aspect Ratio

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