Study On Numerical Simulation Method Of Laser Initiating

Laser detonation is a new kind of blasting technique. Laser ignition has important application value and broad prospects for development, which contains materials application in engineering, scientific research, military, medical and other fields. Laser ignition has advantages of safety, reliability, accuracy. Interaction of laser and material is the basis of laser initiation explosive device and many academics have a lot of researches in this aspect.Theoretical methods to acquire the temperature field can be limited, due to the different geometrical shapes. Also without precision physics experiments, it is a difficult in measuring internal temperature field of materials. At this time, the numerical simulation about researches of laser initiation on precision is particularly critical in the design of initiating explosive device. The results of the numerical simulation become credible basis on explosive temperature field. Domestic and foreign scholars have carried on detailed researches, and published a large number of relevant literatures.This paper mainly researches on the numerical simulation methods for laser initiation. The main research contents are as follows:(a) The heat conduction model of two-dimensional Fourier is established and classical explicit difference scheme is used for numerical calculation of the model;(b) C80micro thermal instrument is used to determinate PETN explosive with the temperature change of specific heat, as a numerical simulation of heat parameter;(c) The heat conduction model of two-dimensional Fourier is used which add laser intensity distribution, laser pulse width, laser pulse shape, explosive chemical heat of reaction, activation energy of explosive, the adulterant in the explosive, etc. The functions of discrete specific heat function generation are used into the model, in order to analysis factor of the influence of laser ignition;(d) The heat conduction model of three dimensional Fourier is calculated;(e) New ideas about laser ignition technology are put forward, that reckons is placed in explosive ignition focused on the micro cartridge, which is coated with high elastic modulus and low density thermal insulation material on the outside of the cartridge, in order to reduce energy loss on the ignition process,and reduce the blasting energy threshold.The factors which have a significant effect on laser ignition are:laser intensity, the adulterant, radius of laser beam, explosive heat; Explosive chemical reaction heat and activation energy of laser ignition. The stronger the intensity of laser, more adulterant, the smaller the radius of the beam, the wider laser pulse width is rectangular wave, low specific heat will be more conducive to initiate explosive...