Shock wave propagation characteristics of double layer charge explosion in the air

This paper studies the radial energy output of double-layer charge overpressure detonation based on the tests of single charge and double-layer charge explosion carried out on shock wave overpressure using ideal and non-ideal explosive of TNT, JO-8 and Hesar. The shock wave overpressure at 2, 3, 4 m was measured using the free filed piezoelectric sensor. The pattern of the shock wave overpressure and impulse varying with the distance was obtained by eliminating the zero-drift and integrating the software Origin. The effect of the charge structure and material was also examined. The results show that the overpressure of TNT/JO-8 double-layer charge in the radial direction was not improved as compared with the single charge with the same volume while the shock wave impulse exhibited a positive gain and increased with the distance. The material selection for the double-layer charge has great influence on the shock wave impulse. The overpressure gain at 4 m was about 15% for the non-ideal/ideal charge, which is much more beneficial in the radial output than for the ideal/ideal charge.