激光等离子体热核与正激波相互作用是复杂激光减阻科学问题中最基本的物理现象。建立了基于激波管和激光能量沉积的实验平台, 利用高精度纹影系统捕捉了激光等离子体热核在正激波冲击下的流动结构特性。实验结果表明: 激光等离子体热核界面变形, 弯曲并最终形成双涡环结构, 展向尺寸迅速增大然后降低并逐渐稳定在7.7 mm左右, 流向尺寸先降低然后在激波离开热核之后以114.3 m/s的速度线性增长, 从微观层面进一步揭示了激光减阻机理, 对等离子体主动流动控制的相关研究具有很好的借鉴参考价值。

The interaction between laser induced plasma hot core and shock wave was a basic physical phenomenon in the scientific problem of laser induced drag reduction. An experimental platform based on shock tube and laser energy deposition was established, and the high-precision schlieren system was used to capture the flow structure characteristics of laser induced plasma hot core under the normal shock. The experimental results show that the interface of laser induced plasma hot core deforms and bends and finally forms a double vortex ring structure, the width rapidly increases and then decreases and gradually stabilizes at about 7.7 mm, the length decreases first and then linearly increases at a rate of 114.3 m/s after the shock leaves the hot core. The mechanism of laser induced drag reduction was further revealed from the microscopic level, which has good reference value for the related research of plasma induced flow control.