NUMERICAL SIMULATION STUDIES ON THE EFFECT OF CHARGE STRUCTURE ON DETONATION DRIVING CHARACTERISTICS OF WHIRLING FRAGMENTS

To attach against clustered low-protection UAVs, this paper proposes a new type of whirling fragment structure and warhead arrangement. The non-linear dynamics software Autodyn was used to carry out a numerical simulation. The detonation drive of whirling fragments by different cavity diameter charges was analyzed. The research results show that as the cavity diameter increases, the pressure peak on the outside of the shell will increase first and then decrease, the detonation wave action time will gradually decrease, and the output of the detonation wave at the end of the detonation action will be smoother; The detonation driving process of the whirling fragment is divided into two stages. The first stage is the sharp acceleration process of the detonation product during the action of the detonation wave; the second stage is the scattering process accompanied by spin motion after the fragment leaves the shell. As the diameter of the cavity increases, the center-of-mass velocity of the whirling fragment decreases; there will be a velocity difference between the head and the tail of the fragment then the velocity will be exchanged. The velocity difference first increases and then decreases with increasing cavity diameter; an increase in the cavity diameter will cause a periodic change in the whirling fragments' rotation, which first decreases and then increases.