典型防爆装备对 TNT 爆炸冲击波的防护性能

Blast shock wave is a strong intermittent load produced by explosive explosion, which is a main harmful factor causing direct damage to human brain, lung and other gas-bearing organs. For an explosion-proof equipment made of two typical materials, the static explosion tests and numerical calculations of various TNT charges were carried out to study the attenuation law of shock wave propagation under three different protection conditions of free air burst (FAB), steel explosion-proof (SEP) and flexible explosion-proof (FEP). The response process and protection mechanism of two typical explosion-proof equipment are analyzed, and the empirical model of weakening the shock wave overpressure peak for the protection of typical equipment is obtained. The research shows that SEP and FEP can significantly reduce the internal blast shock wave load. Compared with FAB at the same location, SEP reduces the peak overpressure of shock wave by 55. 4% ~ 66. 3%, and FEP reduces the peak overpressure by 57. 2% ~ 77. 7% . The shock wave protection ability of FEP is obviously higher than that of SEP during over-equivalent explosion. The main protection mechanism of SEP and FEP is diffraction shielding, but the FEP roof increases the time of interaction between the shock wave and the structure, and weakens the intensity of escaping shock wave through the momentum extraction effect of water and the interface reflection of different wave impedances, while the shock wave in SEP escapes quickly after reflectiing through the rigid materials. The average errors of SEP and FEP shock wave peak overpressure attenuation models are 2. 4% and 10. 2%, respectively. The shock wave weakening law and protection experience model of typical equipment obtained in this paper are expected to provide reference for the design of explosion-proof tank equipment.