A review on effects of different factors on gas explosions in underground structures

Xu, Ying; Huang, Yimiao; Ma, Guowei

doi:10.1016/j.undsp.2019.05.002

Cited by 29 publications

(10 citation statements)

References 98 publications

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“…This can be vividly seen in Figure 18, where the high-frequency part of the Load 1 spectrum is lower than the respective part of the Load 2 spectrum. Hence, people will perceive a weak explosion without turbulizers (Experiment 2) as more intensive compared to the one where turbulizers were present (Experiment 1) [22][23][24][25]. It should also be noted that 2.5 dB is quite a noticeable value for a human.…”

Section: Discussion Of Experiments Resultsmentioning

confidence: 98%

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Комаров

Korolchenko

Громов

et al. 2023

Fire

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Aspects of mathematical and physical modeling of deflagration explosions emerging during atmospheric (outdoor) accidental explosions are addressed. It has been demonstrated that when physically modeling accidental deflagration explosions, a stoichiometric mixture in the shape of a sphere or hemisphere supported by the ground should be used. This allows us to research the parameters of blast loads for the worst-case accidental scenarios or address the accident using the most conservative approach. A technique has been provided allowing one to create a mixture of a given blend composition in the shape of a sphere or hemisphere supported by the ground in outdoor conditions. It has been demonstrated that there is an ability to conduct modeling studies of accidental atmospheric explosions. We have provided examples of modeling studies of accidental atmospheric explosions; a methodology for analyzing experimental results has also been reviewed. The article discusses the mathematical modeling of outdoor (unobstructed) accidental deflagration explosions. It has been demonstrated that it is most reasonable to base computational experiments on linearized (acoustic) equations of continuum motion, as the visible flame propagation rate emerging during explosive combustion is small (compared to the speed of sound). There has been a satisfactory agreement between the numerical analysis and the experimental data.

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Section: Discussion Of Experiments Resultsmentioning

confidence: 98%

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Комаров

Korolchenko

Громов

et al. 2023

Fire

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“…In order to determine the dynamics of excessive pressure inside an EVS-equipped room, the following common differential equation should be solved [34]:…”

Section: Numerical Experimentsmentioning

confidence: 99%

“…The physical significance of parameter G is as follows: the greater the linear dimensions of the building, the lower rate of increase explosive pressure as the overall duration of the explosion extends [34][35][36][37][38]. Therefore, the impulse of the pressure force grows in direct proportion with building dimensions.…”

Section: Introductionmentioning

confidence: 99%

Specifics of Explosion-Venting Structures Providing Acceptable Indoor Explosion Loads

et al. 2021

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This article experimentally and theoretically demonstrates that the presence of blast-relief openings (windows) equipped with explosion-venting structures (EVS) allows explosive pressure to be reduced to a safe level (2–4 kPa). We provide results of model and full-scale experiments aimed at studying the influence of EVS parameters of blast-relief openings in explosion-hazardous buildings on the intensity of explosive loads. It was demonstrated that the maximum explosive-pressure value inside EVS-equipped buildings depends on the EVS start-to-open pressure, the structure’s response rate (lag), and characteristic dimension of the premises. Thus, each particular building requires individual selection of EVS parameters, which provide a safe level of excessive pressure in case of an explosive accident. This aspect, however, prevents the widespread use of EVS at explosion-hazardous sites. This article offers an modest upgrade of the explosion-venting structure that provides an indoor pressure equal to the EVS start-to-open pressure. The suggested innovation excludes the possibility of a significant increase in explosive pressure due to an EVS response delay. The efficiency of the suggested technical upgrade was proven by numerical experiments and indirectly by experimental studies aimed at exploring the physical processes associated with the opening of EVSs after an explosion accident. The use of upgraded EVSs will allow for provision of a known maximum level of the explosion load should an explosion event occur in an EVS-equipped room.

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“…Jing et al deduced the relationship between the peak value of overpressure and the gas velocity and propagation distance in the process of a gas explosion [2]. Some scholars studied the influence of various conditions (initial temperature, ignition conditions, gas concentration, and barrier type) on gas explosion parameters [3][4][5][6][7][8][9][10][11][12]. Some scholars obtained the mechanism of suppressing a gas explosion by ultrasonic water mist and a vacuum chamber through experiments and numerical simulations [13,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Roadway Cross‐Section Shape on Gas Explosion Shock Wave Law in U‐Type Ventilation Working Faces

Liu

Shen

Chen

et al. 2021

Shock and Vibration

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In U-shaped ventilation working face, different tunnel section shapes are one of the important factors affecting the propagation of gas explosion shock wave. In order to study the propagation law of gas explosion shock wave in working face, the numerical simulation study was carried out by using Fluent simulation software combined with the actual situation of gas explosion in #415 working face of Chenjiashan Coal Mine in Shaanxi Province. By constructing a three-dimensional mathematical and physical model, a simulation study of the upper-corner gas explosion was carried out. The results are described as follows. (1) After the gas explosion shock wave propagates 40 m, the overpressure peak equidistant difference tends to be stable and attenuates and propagates in the form of a single shock wave. The study determines that the effective length of the U-shaped ventilation inlet/return tunnel is 40 m. (2) When the tunnel section is trapezoidal, the initial overpressure of the gas explosion shock wave propagating to the inlet/return airway is the highest, followed by rectangular and semicircular arches, but the internal overpressure attenuation trend of different cross-sectional shapes is the same. (3) The gas explosion shock wave propagates radially along the working face section during the working face propagation. The farther away the location is from the upper corner of the tunnel during a gas explosion with different cross-sectional shapes, the closer the cutoff overpressure peak is. The attenuation trend of overpressure with the propagation distance conforms to the power function law. The research results provide an important theoretical direction for the numerical simulation of gas explosions in coal mining faces.

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A review on effects of different factors on gas explosions in underground structures

Cited by 29 publications

References 98 publications

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Specifics of Explosion-Venting Structures Providing Acceptable Indoor Explosion Loads

Influence of Roadway Cross‐Section Shape on Gas Explosion Shock Wave Law in U‐Type Ventilation Working Faces

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