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 mJ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。

It is reported that femtosecond-duration laser pulse can be deployed to reduce drag for blunt-body vehicle in high- Mach flow field of air by generating laser plasma and shockwave. The interaction of plasma shockwave induced by femtosecond-duration laser pulse and bow shock over the head of the blunt-body vehicle is investigated numerically in the flow field of 30 km apart from the surface of the earth at Mach number of 5 and the mechanism of deploying the femtosecond laser plasma to reduce the drag of the vehicle is analyzed. The Navier- Stokes equations are exploited to compute the drag reduction for different femtosecond laser energies. The present numerical experiment proves that the femtosecond laser pulse has a better drag reduction effect than the nanosecond laser pulse under the same condition. When the femtosecond laser energy is 0.06 mJ, the femtosecond laser plasma can reduce the drag by 98%. And the higher the energy of femtosecond laser pulse, the higher the drag reduction ratio and the longer the time of low drag. Deploying three femtosecond laser energy point to reduce the drag of hypersonic vehicle is much more obviously. This energy-deposition mode can improve the optimum drag reduction ratio and save the laser energy.