Experimental method for a double-pulse laserdriven flyer and flyer motion simulation

Flyer velocity is an important indicator to measure the impact initiation ability of laser-driven flyer. In this paper an experimental method of flyer drive by double-pulse is presented. A high speed Schlieren photography system is designed to observe the flyer and shock wave. A one-dimensional (1-D) numerical calculation model is established, which considered phase transition, absorption of laser energy, and dynamic mechanical response. The flyer motion is simulated by using the weighted essentially non-oscillatory (WENO) finite difference method (FDM), level set equation and ghost fluid method. It is found that the double-pulse laser can effectively increase the flyer velocity and energy efficiency. At the end of laser irradiation, the aluminium film exhibits three regions: Gas phase, gas-solid mixture phase and solid phase. During the acceleration process, the flyer undergoes intense compression and tension.