Numerical simulation on influence of initial pressures on gas explosion propagation characteristics in roadway

Zhang, Haohao; Zhenzhen, Jia; Ye, Qing; Yu, Chongxiu; Li, Shujuan

doi:10.3389/fenrg.2022.913045

Cited by 6 publications

(4 citation statements)

References 33 publications

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“…In this research, we simulated a fire in a working face roadway, as shown in Figure 10, which was located on the side of the central axis of the roadway of the working face near the air duct. It is assumed that when oxygen and gas meet the conditions, the fire source position can cause a gas explosion at any time [26,27]. We used the Kailuan experimental tunnel in Tangshan as a modeling reference.…”

Section: Model Establishmentmentioning

confidence: 99%

Optimization and Investigation of Rapid Sealing Technology Based on Mine Disaster Period

Li,

Jing,

Wang

et al. 2023

Fire

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Due to the particularity of mine spaces and the limitations of underground ventilation, the gas in disaster areas changes greatly after a fire occurs. Rapid sealing technology is beneficial for preventing the development of fires and gas explosions by controlling oxygen. Using the Fuzzy Analytic Hierarchy Process (FAHP), in this research, we analyzed the three most effective rapid sealing processes, conducted experimental research on the three sealing processes, and developed a further optimized design. At the same time, according to different stages of blasting damage, the change characteristics and migration laws of explosive hazardous gases in a disaster area were analyzed using fluent numerical simulation. Additionally, the ability of the three optimal processes to create an airtight area was measured in this research. The applicable scenarios and scope of the three technologies were found, which provides a wider range of application scenarios and more diverse options for rapid airtightness during catastrophic periods, mine fire prevention, and explosion protection.

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Section: Model Establishmentmentioning

confidence: 99%

Optimization and Investigation of Rapid Sealing Technology Based on Mine Disaster Period

Li,

Jing,

Wang

et al. 2023

Fire

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show abstract

“…The main algorithm of the ANSYS/LS-DYNA program is the Lagrangian description increment method [21]; that is, the particle coordinate at the initial time is taken as X i (i = 1, 2, 3), and at any time t, the particle coordinate is x i (i = 1, 2, 3).…”

Section: Basic Control Equationsmentioning

confidence: 99%

Numerical Study on Influence of Wall Thermal Effect on Thermal Impact of Gas Explosion

Zhenzhen

2023

Sustainability

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A gas explosion can impact the roadway and cause serious damage. The thermal effect of the roadway wall is an important factor affecting the gas explosion and its impact. In view of the shortcomings of existing research studies, a basic numerical model of a pipe is established under the thermal impact effect of a gas explosion based on LS-DYNA software. The thermal conductivity coefficients of the pipe wall are set as 15, 30, 45 and 60 W/(m·K), respectively. Five measuring points A–E are set on the inner wall of the pipe, and four measuring points F-I are set in the air region. The equivalent stress distribution of the pipe wall, the pressure and displacement of each measuring point and the time history curve of shock wave velocity at the measuring point in the air region are numerically simulated under the impact of a gas explosion with different thermal effects. The research results show that the stress concentration phenomenon is more obvious and the equivalent stress distribution is more uneven, and the gas explosion intensity is greater when the pipe wall is approximately adiabatic. With an increase in the thermal conductivity coefficient, the amount of thermal dissipation through the pipe wall increases, the pressure peak value of each measuring point of the pipe wall decreases as a whole, and the radial displacement value of the arranged measuring points presents a smaller trend. With an increase in the thermal conductivity coefficient of the pipe wall, the thermal dissipation of the pipe wall increases, so the subsequent energy that drives the shock wave decreases, the impact degree on the pipe wall also decreases, and at the same time, in the pipe with a high thermal conductivity coefficient, the gas explosion energy involved in expansion work is lower, and thus the explosion intensity reduces. The shock wave velocity at a location farther away from the explosion source after a gas explosion also decreases. The research results have important practical significance for improving the theory of the wall thermal effect and the level of gas explosion prevention in confined spaces.

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“…[1][2][3] The failure effect of the gas explosion is mainly reflected in the propagation stage of the gas explosion. To master the failure and response characteristics of gas explosion, many scholars have done a lot of research on gas explosion, [4][5][6][7][8][9] and achieved fruitful research results. For example, Yuan summarized the commonly used research methods about the study of dynamic response characteristics of surrounding rock of underground caverns, such as on-site blasting vibration test, theoretical calculation and numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the response characteristics of a roadway wall under the impact of gas explosion

Zhenzhen

2023

Energy Science & Engineering

Self Cite

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Mine gas explosion causes serious failure (damage) to the roadway, but the research on the response characteristics of the impact load of gas explosion to the roadway wall are still very limited. In view of the shortcomings of the existing research, the LS‐DYNA software is used to establish the physical and mathematical models of gas explosion in a roadway, and the validation results show that the model is effective and reliable. Based on the model, changes of pressure, velocity, displacement of roadway walls and equivalent stress under the impact of gas explosions are measured. The response characteristics of the end and wall of roadway under the thermal impact of gas explosion are analyzed. The results show that the pressure on the closed end wall, the center and edge of the roadway is relatively large, and the wall failure is also relatively more serious. With the propagation of gas explosion, the overpressure on the closed end wall gradually attenuates, and the maximum overpressure region also retracts to the center. At the closed end, the explosion pressure is first loaded on the inner wall and gradually transferred to the outer wall. During the transfer, the pressure decays step by step, and the velocity of the measuring point at the closed end decays continuously. With the propagation of gas explosion, the displacement of each measuring point in the Z direction increases continuously. In the axial direction, the displacement near the center of the roadway is large, and then the displacement decreases in the form of regular rings. The impact load produced by the gas explosion is first loaded onto the closed end wall, resulting in wall deformation and equivalent stress. The study results can provide some theoretical basis and data support for the roadway wall design, and reduction of the wall failure.

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Numerical simulation on influence of initial pressures on gas explosion propagation characteristics in roadway

Cited by 6 publications

References 33 publications

Optimization and Investigation of Rapid Sealing Technology Based on Mine Disaster Period

Optimization and Investigation of Rapid Sealing Technology Based on Mine Disaster Period

Numerical Study on Influence of Wall Thermal Effect on Thermal Impact of Gas Explosion

Analysis of the response characteristics of a roadway wall under the impact of gas explosion

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