纳秒激光等离子体减阻数值模拟  

. Numerical simulation of nanosecond laser plasma drag reduction

作　　者：陈豪[1] 石磊[1] 马丽华[1] 徐景 卢朝梁 陈永安[1] 

机构地区：[1]空军工程大学信息与导航学院 [2]95561部队

出　　处：《激光与红外》2014年第2期131-135,共5页Laser & Infrared

基　　金：国家自然科学基金资助项目(No.61108068)

摘　　要：针对激光等离子体减阻技术机理,采用纳秒激光,数值模拟激光等离子体在流场中的演化过程,分析关键参数对纳秒激光等离子体减阻性能的影响。结果表明:纳秒激光能最大程度地提高激光等离子体减阻性能,阻力减小的百分比达99%,低阻力维持时间是入射激光持续时间的103倍;随着来流马赫数的增大,空气来流强度增强,导致减小阻力的百分比减小;随着激光能量的增加,激光引致的冲击波强度增大,使得减小阻力的百分比增加;随着激光聚焦击穿位置的增大,减小阻力的百分比减小,但低阻力维持的时间明显增加。Aiming at the mechanism of laser plasma drag reduction technology,the propagation of the shock wavecaused by the nanosecond laser is numerically simulated.The influence of the key parameters on the air drag reduc-tion performance is analyzed.It can be concluded from the simulation results that the performance of the plasma dragreduction is improved greatly by the nanosecond laser,where the percentage of air drag reduction is close to 99% andthe time of low air drag is 103 times of the incident laser time.The percentage of air drag reduction decreases with theMach number increasing because the intensity of the air inflow increased.The percentage increases with the laser en-ergy increasing because the shock wave caused by the nanosecond laser increases.The percentage decreases with thefocusing location being far,but the time of low air drag obviously increases.

关 键 词：纳秒激光 等离子体减阻 减小阻力的百分比 来流马赫数 激光能量 激光聚焦位置 

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]