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