考虑等离子体屏蔽的TC21减阻沟槽激光烧蚀模型研究

Study on Ablation Model for Drag-reducing Groove Laser of TC21 Alloy with Plasma Shielding

仿生肋骨沟槽表面在航空航天方面具有广泛的减阻应用。为得到低成本、高精度的减阻微沟槽,建立了激光烧蚀TC21钛合金数值模型探究其表面形貌演化规律,模型中考虑激光诱发等离子体屏蔽效应对烧蚀区域的影响并以校正激光能量分布,通过数值模拟结果辅助激光加工。随后,调整激光参数制备不同减阻样片,在密闭通道中测试不同样片的减阻效果。结果表明:考虑等离子体屏蔽效应的二维/三维模型精度得到显著提升,并且所制备的TC21样片最大减阻率可达8.7%,研究结果在激光微纳制造中具有重要的工程价值。

Bionic rib groove surfaces have a wide range of applications in the aerospace engineering.In order to obtain low-cost and high-precision drag-reducing microgrooves,a numerical model for laser ablation of TC21 alloy is established in order to investigate its surface morphology evolution.This model takes into account the influence of the laser-induced plasma shielding on the ablation area and corrects the laser energy distribution,thus assisting laser processing using the numerical simulation results.Subsequently,the laser parameters are adjusted to prepare the different drag-reducing samples,and the drag-reducing effect of different samples is tested in a closed channel.The results demonstrate that the accuracy of the 2D/3D model that considers the plasma shielding effect is significantly enhanced,and the maximum drag reduction rate of the prepared TC21 samples is up to 8.7%,which is of great value in the laser micro-nano-fabrication.