Multi-energy field coupling analysis and experimental validation of picosecond laser drilling assisted by ultrasonic shock-induced water flow

作者：Pengfei Ouyang, Yang Liu, Zhaoyang Zhang, Xiaolei Chen, Yufeng Wang, Hao Zhu, Kun Xu, Jingtao Wang, Xiankai Meng, Shu Huang · 发表于：Defence Technology · 年份：2025 · DOI：10.1016/j.dt.2025.09.002 · 被引用次数：1 · 研究领域：Laser Material Processing Techniques、Laser-induced spectroscopy and plasma、Ocular and Laser Science Research

The latest generation of aero engines has set higher standards for thrust-to-weight ratio and energy conversion efficiency, making it imperative to address the challenge of efficiently and accurately machining film cooling holes. It has been demonstrated that conventional long-pulse lasers are incapable of meeting the elevated quality surface finish requirements for these holes, a consequence of the severe thermal defects. The employment of backside water-assisted laser drilling technology confers a number of distinct advantages in terms of mitigating laser thermal damage, thus representing a highly promising solution to this challenge. However, significant accumulation of bubbles and machining products during the backside water-assisted laser drilling process has been demonstrated to have a detrimental effect on laser transmission and machining stability, thereby reducing machining quality. In order to surmount these challenges, a novel method has been proposed, namely an ultrasonic shock water flow-assisted picosecond laser drilling technique. Numerical models for ultrasonic acoustic streaming and particle tracking for machining product transport have been established to investigate the mechanism. The simulation results demonstrated that the majority of the machining products could rapidly move away from the machining area because of the action of acoustic streaming, thereby avoiding the accumulation of bubbles and products. Subsequent analysis, comparing the process perfor...