基于热点火机理的脉冲激光点火建模及仿真

doi:10.12382/bgxb.2022.0125

摘要/Abstract

摘要：

为研究脉冲激光点火系统中电学参数对点火延迟时间的影响规律,建立脉冲激光点火模型,重点对脉冲激光激励阶段和激光点火阶段进行建模仿真。以BNCP起爆药为例,在脉冲激光激励阶段仿真中,采用电学仿真软件模拟激光驱动电路激励半导体激光器发射激光过程,通过改变储能电容和激光器放电回路电阻的数值,得到不同时刻对应的激光器输出功率;在激光点火阶段仿真中,将脉冲激光激励阶段中仿真得到的不同仿真步长对应的激光器输出功率导入有限元仿真软件,求解得到不同电学参数对应的激光点火延迟时间规律。仿真结果表明:增大驱动电路中的储能电容会加大激光器输出的平均功率,缩短点火延迟时间;增加回路电阻会降低激光器输出的峰值功率,进而增加点火延迟时间。搭建了脉冲激光点火测试平台,得到了不同电容参数下的点火延迟时间,实验验证了所建模型的正确性,为脉冲激光点火系统设计提供了一定的参考依据。

关键词: 激光点火, BNCP起爆药, 储能电容, 回路电阻, 点火延迟时间

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

陈慧敏, 郭鹏宇, 刘承益, 杨旭. 基于热点火机理的脉冲激光点火建模及仿真[J]. 兵工学报, 2023, 44(7): 1930-1937.

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.

图/表 12

图1 RLC充放电等效电路模型

Fig.1 RLC charging and discharging equivalent circuit model

表1 模型参数

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

图2 不同储能电容对应激光器输出功率

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

图3 不同回路电阻对应激光器输出功率

Fig.3 Laser output power corresponding to different loop resistances

图4 功率密度分布图

Fig.4 Diagram of power density distribution

图5 模型网格划分图

Fig.5 Mesh model

图6 温升示意图

Fig.6 Diagram of temperature rise

图7 不同储能电容对应的温度变化曲线

Fig.7 Temperature curves corresponding to different energy storage capacitors

图8 不同回路电阻对应的温度变化曲线

Fig.8 Temperature curves corresponding to different loop resistances

图9 脉冲激光点火测试平台组成图

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

图10 示波器采集波形图

Fig.10 Waveform acquired by oscilloscope

图11 仿真与实测数据对比结果

Fig.11 Comparison results of simulation and measured data

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