Abstract
It is important to study the effect of ambient pressure on air blasts, and the explosion process of TNT explosives was calculated by using the AutoDyn-2D software in this paper. Moreover, the explosion parameters under different ambient pressure conditions were predicted, and the propagation characteristics and laws of the air blast waves were obtained. The results showed that the overpressure of the incident wave, reflected wave, and Mach wave was positively related to the ambient pressure. High ambient pressure resulted in a decrease in the barotropic time and velocity of the incident wave, but its impulse increased. The wavefront of the Mach wave propagated in a curved form, and the pressure distribution on the Mach stem was not uniform. The height of the triple points was inversely proportional to the increase in the ambient pressure, and this trend was significant with the increase in the distance.
Highlights
Modern wars often encounter severe and complex combat environments, especially the ambient low-pressure areas with thin air and extremely cold areas of the Siberian High
In the propagation process of the air blast wave, the relationship between the incident wave and the reflected wave is shown in Eq (3)
The propagation characteristics and laws of air blast waves were studied by changing the ambient pressure
Summary
Modern wars often encounter severe and complex combat environments, especially the ambient low-pressure areas with thin air and extremely cold areas of the Siberian High. After that, Kenned conducted a series of explosion experiments at altitudes of 198, 2011, and 4267 m and found that the measured values of the peak overpressure and the impulse of the incident wave agreed with the calculation of the scaling law.. The experimental results of incident wave pressure and impulse showed that the scaling law is applicable at high altitudes. The authors showed that the pressure and humidity at different altitudes had a significant effect on the air blast wave. According to the scaling law, Swisdak further studied the propagation time of blast waves under different ambient pressures.. After comparison with the empirical formula, a modified explosion parameter equation was proposed Their results showed that the blast wave parameter decreased with decreasing ambient pressure. The propagation characteristics and laws of blast waves, as well as the relationship between explosion parameters and ambient pressure, were obtained. The study results can provide theoretical support and technical guidance for the formulation design of explosives and the damage effect of air blast waves
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