CAJ | 학술논문

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。
침대격광등리자체감조기술궤리，채용납초격광，수치모의격광등리자체재류장중적연화과정，분석관건삼수대납초격광등리자체감조성능적영향。결과표명：납초격광능최대정도지제고격광등리자체감조성능，조력감소적백분비체99％，저조력유지시간시입사격광지속시간적103배；수착래류마혁수적증대，공기래류강도증강，도치감소조력적백분비감소；수착격광능량적증가，격광인치적충격파강도증대，사득감소조력적백분비증가；수착격광취초격천위치적증대，감소조력적백분비감소，단저조력유지적시간명현증가。
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.