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基于组合激光的新概念,对重频脉冲激光与连续激光组合辐照下金属/炸药结构的温升、炸药的热点火规律进行了数值计算。根据一维热传导方程与炸药放热反应理论,考虑金属表面能量耦合系数及物性参数随温度的变化,计算了不同组合参数下金属/炸药结构的温升以及炸药的热点火时间,初步探讨了组合激光的优势。结果表明:在金属表面不发生相变的情形下,在连续激光中加入适当比例的重频脉冲激光,能够提高目标对激光能量的利用效率,增大目标的温升,加快炸药的点火。在平均功率密度相同时,辐照相同的金属/炸药结构使其点火,组合激光所需时间要比连续激光少,且随着金属层厚度的增大其优势更加明显。
Based on the new concept of combined laser, the temperature rise of the metal / explosive structure and the ignition law of the explosive were numerically calculated under the combination of re-pulsed laser and continuous laser. According to the one-dimensional heat conduction equation and the theory of exothermic reaction of explosives, the temperature rise of the metal / explosive structure and the ignition time of the explosive under different combinations of parameters were calculated considering the variation of the energy coupling coefficient and the physical parameter of the metal surface with temperature. Laser advantage. The results show that when the metal surface does not change phase, adding the appropriate frequency pulse laser to the continuous laser can improve the utilization efficiency of laser energy, increase the target temperature rise and accelerate the ignition of the explosive. When the average power density is the same, the same metal / explosive structure is irradiated to ignite, the time required to assemble the laser is less than that of the continuous laser, and the advantage is more obvious as the thickness of the metal layer increases.