Modeling and Simulation of Pulsed Laser Ignition Based on Thermal Ignition Mechanism

doi:10.12382/bgxb.2022.0125

Abstract

Abstract:

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.

Key words: laser ignition, BNCP, storage capacitance, circuit resistance, ignition delay time

CHEN Huimin, GUO Pengyu, LIU Chengyi, YANG Xu. Modeling and Simulation of Pulsed Laser Ignition Based on Thermal Ignition Mechanism[J]. Acta Armamentarii, 2023, 44(7): 1930-1937.

Figures/Tables 12

Fig.1 RLC charging and discharging equivalent circuit model

Table 1 Model parameters

参数	含义
ρ/(kg·m^-3)	密度
c/(J·kg^-1·K^-1)	热容
T/K	温度
λ/(W·m^-1·K^-1)	热导率
f_r	生成物质量分数
n	发生化学反应的反应级数
Q/(J·kg^-1)	反应热
A/s^-1	反应频率因子
E/(J·mol^-1)	活化能
R/(J·mol^-1·K^-1)	玻尔兹曼常数
ref	反射率
β/m^-1	吸收系数
P(r,t)/(W·m^-2)	入射激光功率密度

Fig.2 Laser output power corresponding to different energy storage capacitors

Fig.3 Laser output power corresponding to different loop resistances

Fig.4 Diagram of power density distribution

Fig.5 Mesh model

Fig.6 Diagram of temperature rise

Fig.7 Temperature curves corresponding to different energy storage capacitors

Fig.8 Temperature curves corresponding to different loop resistances

Fig.9 Diagram of composition of pulsed laser ignition testing platform

Fig.10 Waveform acquired by oscilloscope

Fig.11 Comparison results of simulation and measured data

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