Numerical Simulation And Theoretical Analysis Of Powder Particle On Laser Ignition

In order to satisfy the requirement of security and reliability for the high-performance weapons, laser ignition system has been extensively developed. Based on the laser ignition, theoretical and numerical simulation of laser ignition on the powder granule is studied. The main parts are concluded as follows:a) The one-dimensional sphere model is established by the Non-Fourier heat conduction law, it is numerically calculated by Dufort-Frankel scheme, and different factors during the process of ignition are analyzed, such as particle radius, activation energy, pulse width, frequency factor and thermal conductivity.b) The two-dimensional cylindrical model is established by the Non-Fourier heat conduction law, it is numerically calculated by Dufort-Frankel scheme, the temperature distribution of powder granule is obtained, the influence of particle size and absorption thickness and laser energy are analyzed during the process of ignition.c) The three-dimensional porous powder model is established by the Non-Fourier heat conduction law. The complex shape of porous powder is dealt with unstructured mesh. Finite volume method is used to discrete the governing equation, and the calculation program is written to calculate the geometry parameters which are needed in the discrete equations. The calculation program is coupled with the FVM program to simulate the process of three-dimensional porous powder of laser ignition.d) Considering the phase transition of powder particle, melting model of laser ignition is built to analyze the influence of the melt process on laser ignition, and provide a theoretical basis for the mechanism of laser ignition.