激光参数对光船性能影响分析  

Analysis of Impact of Laser Parameters on Performance of Lightcraft

作　　者：鄢昌渝[1] 吴建军[1] 刘洪刚[1] 何振[1] 

机构地区：[1]国防科学技术大学航天与材料工程学院,湖南长沙410073

出　　处：《航空学报》2009年第2期193-199,共7页Acta Aeronautica et Astronautica Sinica

基　　金：国家"973"基础研究(61328);教育部"新世纪优秀人才支持计划"(NCET-06-0927);国防基础预研项目

摘　　要：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8μs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。The absorptive process of laser energy in plasma is simulated by a thermo-ehemical 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 lighteraft 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.

关 键 词：航空航天推进系统 激光推进 吸气模式 冲量耦合系数 数值模拟 

分 类 号：V237[航空宇航科学与技术—航空宇航推进理论与工程]