论文部分内容阅读
报道了利用飞秒激光产生的等离子体冲击波对高超声速飞行的钝体飞行器进行减阻的研究。通过模拟计算了距离地球表面30 km、来流马赫数为5的大气环境中,飞秒激光能量注入后产生的等离子体冲击波与钝体飞行器头部正激波相互耦合的演化过程,分析了飞秒激光等离子体减阻的机理。通过求解Navier-Stokes方程,计算了飞秒激光能量对飞行器减阻效果的影响。结果发现,利用飞秒激光产生的等离子体冲击波比纳秒激光等离子体冲击波对飞行器的减阻效果更明显。当飞秒激光能量为0.06 m J时,能使飞行器所受的阻力减小98%,飞秒激光能量越高,减阻比越高,低阻力持续的时间越长,减阻效果越好。采用3个飞秒激光能量点源沉积的方式能够更好地实现飞行器的减阻,提高了最佳减阻比,节省了激光能量。
Reported the use of plasma shock wave generated by femtosecond laser hypersonic flying bluff body aircraft drag reduction research. The evolution process of the plasma shock wave generated by the injection of femtosecond laser energy and the forward shock wave of the bluff body was simulated by simulating the atmospheric environment at a velocity of Mach 5 of 30 km from the Earth’s surface. Second laser plasma drag reduction mechanism. By solving the Navier-Stokes equation, the influence of femtosecond laser energy on the drag reduction of aircraft is calculated. The results show that the use of plasma shock wave generated by femtosecond laser than nanosecond laser plasma shock wave on the drag reduction effect of the aircraft is more obvious. When the femtosecond laser energy is 0.06 m J, the resistance of the aircraft can be reduced by 98%. The higher the femtosecond laser energy is, the higher the drag reduction ratio is, and the longer the drag duration is, the better the drag reduction effect is. The use of three femtosecond laser energy point source deposition method can better achieve the drag reduction of the aircraft to improve the optimal drag reduction ratio and save the laser energy.