椭圆截面侵彻弹体爆炸特性试验研究

To study the explosion characteristics of penetrator with elliptical cross-section, a static explosion experiment was designed and carried out. The penetrator with a mass of 255 kg was erected on a wooden cartridge, the centroid height was 2 m from the ground, and the test fuse was used to detonate the penetrator explosive. The aerial drone was used to record the whole explosion process in real time, the sector effecting steel plates were arranged in the major and minor axis directions to obtain the number and perforation rate of fragments, and the shock wave overpressure at the distance of 7, 10 and 12 m from the penetrator axis was measured. The macroscopic scene and the characteristics of fireball, fragment, and shock wave overpressure after explosion are analyzed in detail. Results show that the evolution morphology of the fireball and the fragment distribution area are symmetrically distributed with respect to the major axis and minor axis. The evolution of fireball can be divided into rapid growth stage, high temperature stability stage and free diffusion stage. The fireball size reached its maximum at 41.7 ms after explosion, and the maximum size in the minor axis and major axis directions was 21.86 and 19.29 m, respectively. Besides, the fireball size in the major axis direction had obvious secondary expansion. The fragments in the minor axis were small in size, large in number, and strong in perforation, while the fragments in the major axis had the opposite characteristics. The overpressure peak value, impulse, and velocity of shock wave decrease with the increase of propagation distance. Based on the experimental results, it can be concluded that the non-axisymmetric structure and non-uniform wall thickness of the elliptically cross-sectional penetrator have a great influence on the explosion characteristics, leading to the morphology of the non-axisymmetric distribution of the fireball and fragments.