Explosion venting of hydrogen-air mixture in an obstructed rectangular tube

Wang, Qiao; Luo, Xianqi; Quan, Li; Rui, Shengchao; Wang, Changjian; Zhang, Aifeng

doi:10.1016/j.fuel.2021.122473

Cited by 19 publications

(6 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chen et al [33] found that there was a structure of reverse flow induced by the blocking obstacles in the flow field of premixed methane-air combustion during the experiment. In addition, Wang et al [8] also showed that the flow field of premixed hydrogen and air also appeared as a unique structure in the experiment. Meanwhile, Chen et al [34] suggested that the plate gaps also could stimulate the reverse flow, which showed that the blocking obstacles were similar to the plate gaps.…”

Section: Introductionmentioning

confidence: 84%

“…With the disappearance of the premixed gas in the tube, the pressure of the content of the tube gradually drops to 0. The process of numerical simulation was simplified by covering the PVC membrane at the outlet; therefore, there was not such a small pressure peak and it slowly returned to zero [8].…”

Section: Numerical Verificationmentioning

confidence: 99%

“…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%

See 2 more Smart Citations

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 84%

Section: Numerical Verificationmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2022

View full text Add to dashboard Cite

show abstract

“… 19 Wang et al studied the effect of obstruction ratio on hydrogen explosion in rectangular tubes with obstacles and found that the peak explosion overpressure increased with the increase of obstruction ratio. 20 …”

Section: Introductionmentioning

confidence: 99%

“…Kuznetsov et al carried out a study of hydrogen explosions for five vent sizes and found that the peak pressure was independent of the vent opening area . Wang et al studied the effect of obstruction ratio on hydrogen explosion in rectangular tubes with obstacles and found that the peak explosion overpressure increased with the increase of obstruction ratio …”

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

View full text Add to dashboard Cite

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.

show abstract

Study of Obstruction Rate in Confined Spaces on the Behavior and Overpressure Characteristics of LPG Deflagration Flame

Gao,

Han,

et al. 2024

Lecture Notes in Electrical Engineering

View full text Add to dashboard Cite

Explosion venting of hydrogen-air mixture in an obstructed rectangular tube

Cited by 19 publications

References 52 publications

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

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

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

Study of Obstruction Rate in Confined Spaces on the Behavior and Overpressure Characteristics of LPG Deflagration Flame

Contact Info

Product

Resources

About