Analysis of flow field in a blast simulator combined-driven by explosive charge and compressed gas

Chen, Zhuo; Ren, Haigang; Ning, Huijun; Zhou, Songbai; Long, Zhilin; Huang, Kui

doi:10.3389/feart.2022.1094415

Cited by 1 publication

(3 citation statements)

References 31 publications

(23 reference statements)

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“…In addition, the driving method also affects the waveform of the shock wave. Compared to the compression-driven method, the shock wave produced by the explosive-driven method is closer to the waveform of a free-field explosion [ 3 , 9 ]. Ren et al suggested that the multi-point detonation method reduced the structural strength requirements of the chamber compared to direct detonation in the chamber [ 18 ].…”

Section: Discussionmentioning

confidence: 99%

“…The solution is suitable for high detonation, explosion safety, and general compressible flow conditions [ 26 ]. It can accurately simulate the explosion flow field in the shock tubes [ 3 ]. The numerical simulations use the Euler governing equation based on explosive detonation.…”

Section: Methodsmentioning

confidence: 99%

“…Reinforced concrete is widely used in civil engineering structures [ 1 , 2 ]. With the rapid development of the economy, many important economic facilities are threatened by accidental explosions and terrorist attacks [ 3 ]. The shock tube is a device that can be used to simulate blast waves, which can test most materials and engineering structures [ 4 , 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Overpressure Fields in a Shock Tube with Multi-Point Initiation

Chen

Ren²,

Zhao³

et al. 2023

Sensors

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Shock tubes can carry out dynamic mechanical impact tests on civil engineering structures. The current shock tubes mostly use an explosion with aggregate charge to obtain shock waves. Limited effort has been made to study the overpressure field in shock tubes with multi-point initiation. In this paper, the overpressure fields in a shock tube under the conditions of single-point initiation, multi-point simultaneous initiation, and multi-point delayed initiation have been analyzed by combining experiments and numerical simulations. The numerical results match well with the experimental data, which indicates that the computational model and method used can accurately simulate the blast flow field in a shock tube. For the same charge mass, the peak overpressure at the exit of the shock tube with the multi-point simultaneous initiation is smaller than that with single-point initiation. As the shock waves are focused on the wall, the maximum overpressure on the wall of the explosion chamber near the explosion zone is not reduced. The maximum overpressure on the wall of the explosion chamber can be effectively reduced by a six-point delayed initiation. When the interval time is less than 10 ms, the peak overpressure at the nozzle outlet decreases linearly with the interval of the explosion. When the interval time is greater than 10 ms, the overpressure peak remains unchanged.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%