基于热点火机理的脉冲激光点火建模及仿真

To study the influence of electrical parameters on the ignition delay time in the pulsed laser ignition system, a pulsed laser ignition simulation model is designed, and especially, the modeling and simulation of the pulsed laser excitation stage and the laser ignition stage are performed. Taking BNCP detonating agent as an example, an electrical simulation software is used to simulate the laser emission process of the semiconductor laser excited by the laser driver circuit in the simulation of the pulsed laser excitation stage. By changing the values of the energy storage capacitor and the resistance of the laser discharge circuit, the corresponding laser output power at different times is obtained. In the the laser ignition stage, the laser output power corresponding to different simulation steps obtained in the pulsed laser excitation stage is imported into the finite element simulation software, and the laser ignition delay time law corresponding to different electrical parameters is solved. The simulation results show that: the average output power of the laser increases and the ignition delay time is shortened by increasing the energy storage capacitance in the driver circuit; increasing circuit resistance leads to the reduction of the peak output power of the laser and the increase of the ignition delay time. The experiments has verified the simulation model. The established pulsed laser ignition model can provide theoretical reference for the hardware design of the pulsed laser ignition system.