Research Of The Simple Plane Wave Generator

Plane wave generator is an important tool to study materials equation of state(EOS) at high strain rates, consisting of two kinds of high and low detonation velocity explosive is widely applied. Explosive plane wave generator is based on the principle of geometrical optics Huygen-Snell, to adjust the initiating deotnation wave to plane wave through different paths by determining the boundary curve of different detonation velocity explosive.Based on the relevant principle of plane wave generator(PWG), a simple PWG with size of 100 mm diameter was designed in this work. The form processing of plane wave was simulated numerically by means of nonlinear finite element software AUTODYN-2D. The waveform of detonation wave at different time was obtained, and the flatness of waveform was measured. Meanwhile, motion process of flyer driven by simple PWG was also simulated, and flyer movement law was given. The simulation results indicate that, 1) within the scope of the 60% and 70% diameter, the flatness of the waveform is 0.057μs and 0.098μs respectively; 2) With the increase of cavity height, speed of flyer growing quickly at the beginning, tends to be stable in the end; 3) Keeping the same height of cavity, speed of flyer gradually reduced with the increase of air-gap thickness. Besides, due to the influence of the side sparse effect, the target waveform difference of the flyer at 10 mm cavity height is bigger and bigger, along with the increase of air-gap thickness.To a certain extent, The research results in this paper provide ideas and methods for simplified research of plane wave generator and basis for the manufacture of explosive devices loaded.