Electric Explosion Of Metal Foil Driven Flyer Numerical Simulation Of The Dynamic Processes,

The thesis mainly discusses accelerating process of the first flyer and the optimization design of the second flyer for two-staged electric gun. Based on numerical simulation and correlative experiments, an in-depth research on the process of the first and second flyer has been maken.Putting specific power curves measured into the Schmidt model, then contrasting the velocity history of the first flyer with it, a finely linear relation between the correcting coefficient and charging voltage can be given. With the Schmidt model, it is easy to obtain a good estimation of velocity history for 14.4KJ electric gun working at different voltages.On the basis of one dimensional Lagrange hydrodynamic program named SSS code, an EOS database of SESAME was incorporated into the SSS code, and the energy equation was modified. Making use of the one-dimensional simulation of the first flyer driven by electric explosion, the velocity history and physical parameters of flyer at different time can be obtained. A rule of flyer influenced by some factors, such as charging voltage, size of bridge foil, ratio of foil and flyer can also be worked out.In the end, using the velocity history of the second flyer with VISAR, two-dimensional simulations of the second flyer by LS-DYNA program are implemented. With the analysis of numerical simulation, the process of shock wave transmitting the attenuating board and the exactly influence of declining range and pulse extending caused by thickness of attenuation board can be obtained. At the same time, the rule of flyer velocity affected by factors, such as thickness of attenuation board and flyer, material of flyer can be given.A series of numerical simulation programs and data disposing methods for acceleration of flyer driven by electric gun has been developed in this thesis, and will provide support for subsequent research.