Research On Numerical Simulation Of The Thermal Interaction Process Of The Laser And Material

It is investigated the formation and development of laser-induced heating, melting and evaporating process during laser-matter interaction, together with the temporal and spatial variation of laser-induced evaporation shock wave in theory and simulation. The corresponding software and interface based on Windows operating platform are developed.Based on the up-to-date theoretical and simulating results of high power laser-matter interaction at home and board, it is discussed the basic mechanisms of target materials' absorption, reflection and conversion to the laser energy in detail. The laser-induced temperature variations in materials during the heating and melting process are presented, respectively. The impelling speed of the solid-liquid interface, the mass-transfer of liquids' state, the mass-transfer of laser-induced evaporation and ablation, the absorption of vapor to laser energy and its dynamic model are analyzed in detail.Further, the temperature field and its distribution during the heating, melting and evaporating process, associated with the impelling speed of the solid-liquid interface are simulated by means of the implicit schemes difference expression.Based on the continuity, momentum and energy equations, by the high-resolution multi-phase flows Euler method and TVD expression, the laser-induced vapor field and shock wave development are numerically simulated. The corresponding physical parameters, such as temperature, pressure, speed and density etc, together with their distribution and development are obtained. Most of the simulated results are in agreement with the Russian results under DOS operating platform.Besides, the simulated results above are first realized by Delphi program under Windows operating platform.The research work will provide the theoretical reference to both the laser weapon destruction and laser processing efficiency.