针对激光减阻中激光等离子体热核与正激波相互作用物理现象, 运用高精度纹影测量技术研究分析了激光等离子体热核在正激波冲击下的流动结构特性, 获得了激光能量与激波速度两个关键因素的影响规律。实验结果表明: 在正激波的冲击下, 热核宽度呈先上升然后稳定并有减小的趋势, 入射激光能量越高, 热核在激波冲击下的宽度越大; 热核的长度在正激波冲击下迅速减小然后以固定的速度线性增长, 增长速度约为入射激波速度的19%。研究结论可为实际应用中有效增强减阻效果和延长持续时间提供依据, 相关方法和结果对激光等离子体主动流动控制研究也具有很好的参考价值。

To study the phenomenon of interaction between laser induced plasma hot core and normal shock wave in application of laser induced drag reduction, high-precision schlieren measurement technology was used to study and analyze the flow structure characteristics of laser induced plasma hot core under the impact of normal shock wave, and the influence law of laser energy and shock speed was obtained. The experimental results show that under the impact of the normal shock wave, the width of the hot core is firstly increased and then stabilized and decreased. The higher the incident laser energy is, the larger the width of the hot core is. The length of the hot core rapidly decreases under the impact of normal shock and then grows linearly, with a growth rate of approximately 19% of the incident shock speed. A basis for effectively enhancing the drag reduction effect and prolonging the duration in practical applications can be provided by the conclusions. The relevant methods and results also have a good reference value for the study of laser plasma active flow control.