Influence of plasma’s initial density on laser-supported detonation waves
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摘要: 采用守恒元求解元方法，对描述激光支持爆轰波等离子体流场演化的二维轴对称流体动力学控制方程组进行了数值模拟计算，给出了不同时刻点的等离子体压强、密度、温度、速度及对激光吸收系数的空间分布，比较了初始密度不同的情况下等离子体演化的不同特点。计算结果表明，等离子体初始密度较大时，等离子体对激光的吸收系数较大，为了增强激光能量与靶面的耦合，应合理控制靶面等离子体密度、激光脉宽及脉冲间隔。
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关键词:
- 激光支持爆轰波 /
- 控制方程 /
- 数值模拟 /
- 时空守恒元求解元方法
Abstract: The conservation equations describing the movement of the plasma in the laser-supported detonation process are numerically calculated with the space-time conservation element and solution element method. The distributions of the pressure, the density, the temperature, the velocity and the absorption coefficient of the plasma at different time interval are given. The characters of the evolving plasma with different initial density are compared. It is concluded that, the absorption of laser is larger when the plasma has larger initial density. The laser energy can be better coupled to the target by modifying the initial density of the plasma, the duration of the laser pulses and the pulse interval. -
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