Study on numerical simulation of gas explosion in confined volume

Wang, C.; Lu, Jianying; Ning, Jianguo

doi:10.1007/978-3-540-27009-6_152

Cited by 4 publications

(5 citation statements)

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“…In this experiment, a "shuttle-shaped" projectile and a paper strip pasted at the center of the end face of the projectile incident rod was used as a waveform shaper to obtain a smooth half-sine wave (Zhou et al 2005), which not only eliminates the dispersion effect but also filters out high-frequency waves. In addition, friction is a factor that determines whether all compression experiments are effective (Wang et al 2006). The shear force generated by friction will change the stress state in the specimen and hinder Damper CPG V lateral deformation of the specimen.…”

Section: Scdc Sandstone Sample Preparationmentioning

confidence: 99%

Study on the whole dynamical fracture process of sandstone samples

Cao,

Yang,

et al. 2023

Preprint

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The single cleavage drilled compression specimens of sandstone were impacted by the large-diameter split Hopkinson pressure bar, the whole model-I dynamical fracture process was successfully observed. A crack propagation gauge is used to monitor the key time moment of dynamic initiation, propagation, arrest and re-initiation, respectively. The fractal crack extension model is used to analysis the propagation speed of tortuous crack, and with further combination of the experimental-numerical-analytical method, to determine dynamic initiation toughness, dynamic propagation toughness, dynamic arrest toughness, and dynamic re-initiation toughness of sandstone. The results show that in the process of crack propagation, the crack propagation path is torturous, for this curved path, the value of the universal function, which is characterized by the crack’s velocity, is smaller than that with a straight path. The dynamic propagation toughness thus obtained is closer to its real value by using the fractal model. Sandstone’s dynamic initiation toughness is greater than the dynamic arrest toughness, and dynamic initiation toughness is slightly bigger than the dynamic re-initiation toughness.

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Section: Scdc Sandstone Sample Preparationmentioning

confidence: 99%

Study on the whole dynamical fracture process of sandstone samples

Cao,

Yang,

et al. 2023

Preprint

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“…It was concluded that the higher the position of the vent and the greater the wind speed, the more favorable the diffusion of natural gas. Wang Zhihua [11] used a numerical simulation method to simulate a hydrogen tank in a ventilated room and studied the position of the vent and the effect of obstacles. There was an influence on the hydrogen concentration distribution and diffusion velocity field in the room.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Gas Distribution Law and Operational Risk Analysis of a Vertical Gas Tank in a Ventilation State

Yang,

Wang,

Liu

et al. 2023

Energies

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As a type of airtight equipment, vertical gas tanks are prone to accumulations of toxic and harmful gases due to their poor ventilation and narrow space. This poses many safety hazards. Therefore, we conducted a FLUENT simulation for vertical gas tanks with different diameters. The results indicated that the larger the diameter, the longer the required ventilation time. It was necessary to monitor the gas concentration after ventilation for at least 6 h when the tank diameter was 2.6 m, after ventilation for at least 24 h when the tank diameter was 5.2 m, and after ventilation for at least 80 h when the tank diameter was 7.8 m. To ensure comprehensive monitoring, at least one monitoring point was required to be placed at the upper and lower ends of the vertical gas tank, respectively. Monitoring was initiated after these requirements were reached. A theoretical numerical analysis and an experimental verification analysis were conducted on the simulation results. The variation trend of the simulation value, the theoretical value, and the experimental test value were the same. The measured value of the ventilation duration was greater than the theoretical value of the ventilation duration and the simulation value of the ventilation duration. Therefore, the simulation results and theoretical analysis could be used for a risk analysis of gas tanks. The determination of ventilation characteristics via a simulation of vertical gas tanks has a practical significance when guiding on-site operations.

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“…Hopkinson pressure bar [4] has been widely used to evaluate the overload resistance of initiating explosive devices and calibrate high-gravitational acceleration sensors [5]. In the experiment of Hopkinson compression bar, the stress in the bar is a one-dimensional stress state [6,7]. The propagation speed of the wave in the rod and the waveform of the stress wave in the compression rod directly reflect the stress-strain relationship of the rod.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of barrel venting on the overload waveform of projectile in bore

Zhao

Chao

Cao

et al. 2023

J. Phys.: Conf. Ser.

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In order to evaluate the anti shock overload ability of electronic components and parts in explosive device launcher, half sine wave generator with certain amplitude and pulse width is often used to verify it. In this paper, gun launcher is used as the shock wave generator. Different charge structures are studied for the interior ballistics process of barrel with or without venting according to certain requirements of mechanical overload. The influence of different charge structure, chamber volume and vent hole size on the overload waveform of projectile in the process of interior ballistic is studied by numerical simulation. The simulation results show that the larger the vent diameter is, the closer it is to the standard waveform. The research results can provide references for the matching design of projectile and artillery, the research and development of intelligent ammunition and the assessment. The research results can provide for the matching design of new artillery projectile and artillery and the research and development of intelligent ammunition.

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Study on numerical simulation of gas explosion in confined volume

Cited by 4 publications

References 0 publications

Study on the whole dynamical fracture process of sandstone samples

Study on the whole dynamical fracture process of sandstone samples

Simulation of the Gas Distribution Law and Operational Risk Analysis of a Vertical Gas Tank in a Ventilation State

Study on the influence of barrel venting on the overload waveform of projectile in bore

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