One dimension finite difference simulation of laser ignition
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摘要: 从激光点火的热机理出发,建立了激光点火过程的一维有限差分模型,并对B/KNO3/酚醛树脂点火药的激光点火特性进行了数值模拟。结果表明,随着入射激光能量水平、入射激光功率、入射激光能量密度、药剂激光吸收系数的减小,药剂的点火延迟时间延长 ;当入射激光能量水平接近点火能量阈值时,药剂表面温度的成长曲线出现双峰现象 ;点火功率阈值随着光束半径的增大而增大,随着脉冲宽度的增大而减小。模拟结果与实际激光点火过程的规律一致,与实验结果基本吻合。Abstract: Based on the thermal mechanism of laser ignition, a one dimension finite difference model has been developed to model the process of laser ignition.The laser ignition characters of B/KNO3/bakelite has also been simulated. Results show that with laser energy, laser power, laser energy density or laser absorption coefficient increasing, ignition delay time is prolonged,variation curve of surface temperature of the powder appears double peaks with laser energy approaching ignition energy threshold,and that ignition power threshold increases with beam semidiameter augmenting, while reduces with laser pulse augmenting. Simulation results are accord with actual rules of laser ignition and experimental outcomes on the whole.
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Keywords:
- laser ignition /
- one dimension /
- finite difference model /
- simulation
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