激光重复频率对吸气式多脉冲激光推进冲量耦合系数的影响  

Influence of Laser Pulse Repetition Rate on Impulse Coupling Coefficient of Air-breathing Propulsive Performance for Multi-pulses

作　　者：宋俊玲[1] 洪延姬[2] 文明[2] 李倩[2] 

机构地区：[1]装备指挥技术学院研究生管理大队,北京101416 [2]装备指挥技术学院基础部,北京101416

出　　处：《装备指挥技术学院学报》2010年第5期115-119,共5页Journal of the Academy of Equipment Command & Technology

基　　金：国家自然科学基金资助项目(10672184)

摘　　要：针对实验室已有的平顶抛物形喷管,数值模拟了单脉冲激光能量为500J时,不同激光重复频率下的激波流场演化过程,分析了喷管内激波流场对后续脉冲的影响,得到了冲量耦合系数随激光重复频率的变化规律。结果表明：激光重复频率在10～100Hz范围内,冲量耦合系数随频率的增加显著减小;在100～400Hz范围内,冲量耦合系数下降趋势变缓;随着脉冲数目的增多,喷管内气体密度降低,后续脉冲受到之前激波流场影响增大,推进性能降低。Aimed at flat-roofed parabolic model designed in lab,the process fluid field with different laser repetition rates is simulated by using 500 J single pulse energy.The influence of pre-shock fluid field to the sub pulses in multi-pulses conditions is analyzed,therefore,the curves of impulse coupling coefficient and laser repetition frequencies are presented.The simulation results indicate that impulse coupling coefficient decreases significantly with the laser repetition frequency when it increases in the range from 10 Hz to 100 Hz,and has a little variation when the laser repetition frequency is between 100 Hz and 400 Hz.The propulsive performance is decreased because the sub pulse is influenced by the pre-shock fluid field greatly due to the reducing density air by increasing the pulse number.

关 键 词：激光推进 多脉冲 激光频率 冲量耦合系数 推进性能 

分 类 号：TN249[电子电信—物理电子学] V439[航空宇航科学与技术—航空宇航推进理论与工程]