激光参数对光船性能影响分析

 采用三温度11组元热化学非平衡空气模型计算了激光能量在等离子体中的沉积过程，并在激光脉冲作用结束8 μs后采用平衡空气模型，完成激光推进光船工作过程的数值模拟，研究了不同入射激光能量和脉冲宽度对光船推进性能的影响。结果表明:当脉冲宽度相同时，入射激光能量越大，所得冲量耦合系数越大；当入射激光脉冲能量相同时，脉冲宽度越小，所得冲量耦合系数越大。将计算所得冲量耦合系数与Schall实验所得结果进行比较，结果非常吻合。

Analysis of Impact of Laser Parameters on Performance of Lightcraft

The absorptive process of laser energy in plasma is simulated by a thermo-chemical non-equilibrium air model which contained 3 temperatures and 11 species. 8 μs after the laser is terminated, the simulation is switched to an equilibrium air model to compute the operating process of a laser propulsion lightcraft. Then influences as laser energy and pulse length on the propulsive performance of the lightcraft are investigated. The results show that when the pulse length is kept equal, impulse coupling coefficient increases along with laser energy increase, while the impulse coupling coefficient increases along with the decrease of pulse length when laser energy is equal. The coupling coefficients for the lightcraft predicted by simulation agree well with those of tests done by Schall.