Experimental Study And Numerical Simulation Of Interaction Of Laser And Energetic Materials

Laser Ignition is a newly developed ignition technology. But there still are many characteristics which even now can not be understood. They clearly effecting the process of laser ignition. In the process of transmitting and coupling of laser energy, there are some factors which caused energy lose. By doing experiment, these factors can be analyzed. Besides, since the instantaneity and complexity of the process, now it is difficult to completely understand the characteristics of laser ignition of energetic materials. Thus researchers analyze the characteristics with mathematic models and numerical simulation. The purpose of this dissertation is to research on the factors which cause energy lose and analyze the characteristics of laser ignition by the coupling of heat conduction and gas dynamic model of laser ignition of energetic materials.The main points are as follow:(1) The characteristics of laser are analyzed, since they are the most important things for laser to be regarded as the best ignition power. And the mechanisms of laser ignition have been discussed. The distribution law of laser in energetic materials has been shown.(2) Experiment of transmitting and coupling of laser energy has been done. The data of laser energy have been gotten after it passed some parts of laser ignition system with energy gauge. The ratios of energy lose have been calculated. Through those results, the reasons causing the energy lose and distributions have been discussed.(3) The coupling of heat conduction and gas dynamic model of laser ignition of energetic materials has been established. The effects of different characteristics on ignition processes are analyzed with the results which are simulated and calculated, such as laser beam radius, thermal conduction and so on.