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Numerical Simulation of Double-Pulse Laser-Driven Flyer

The technology of laser-driven flyer can be applied in research fields such as explosives initiation. Flyer velocity is an important indicator to measure the impact initiation ability of laser-driven flyer. A one-dimensional numerical simulation model of laser-driven flyer is established. The phase transition of the aluminum film, the laser energy absorbed by plasma, the dynamic mechanical response inside the flyer and the interaction between the flyer and air are considered. The plasma-driven flyer process are simulated by using the weighted essentially non-oscillatory (WENO) finite difference scheme, level set equation and ghost fluid method. It is found that at the end of laser irradiation, the aluminum film exhibits three regions: gas phase, gas-solid mixture phase and solid phase. High pressure plasma forms the gas phase region, and its width represents the ablation depth of aluminum film. The solid phase region forms a flyer under the action of the plasma. During the acceleration process, the flyer undergoes intense compression and tension. The flyer velocity can lie improved by using double-pulse laser.