Afterburning Effect of Thermobaric Explosives in Confined Space

The explosion of thermobaric explosive has a significant afterburning effect, and itsexplosion in a confined space has multiple destructive effects. However, the coupling effect of multiple damage elements due to afterburning effect and the quantitative analysis of the afterburning enhancement effect are not clear yet. The implosion test of thermobaric explosives and LiF instead of aluminium powder explosive under different dosages is carried out ina large enclosed building, and the temperature, shock wave overpressure, quasi-static pressure and oxygen concentration are tested. The temporal and spatial variation characteristics of various damage elements under implosion conditions are analyzed, and the distribution characteristics of explosion damage elements are determined. The distribution characteristics of explosion damage elements in closed buildings and the influences of aluminium powder afterburning effect on temperature, shock wave overpressure, quasi-static pressure and oxygen concentration are clarified through the comparative test of LiF instead of aluminium powder explosion. The results show that the thermal effect and pressure impact of internal explosion in confined space are significantly enhanced at the corner boundary, and the total specific impulse at the boundary is increased by 2. 2 - 2. 5 times. The afterburning effect of aluminium powder can significantly improve the temperature, shock wave overpressure, quasi-static pressure and oxygen consumption. When the dosage reaches 300 g, the aluminium powder afterburning leads to the explosion shock wave overpressure peak increased by 1. 2 times, the temperature peak increased by 6. 4 times, the quasi-static pressure increased by 2. 2 times, and the oxygen concentration consumption increased by 2. 8 times. © 2024 China Ordnance Industry Corporation. All rights reserved.