Heat Transfer and Mode Transition for Laser Ablation Subjected to Supersonic Airflow

Abstract

When laser ablation is subjected to supersonic flow, the influence mechanism of airflow on laser ablation behavior is still unclear. A coupled thermal-fluid-structure model is presented to investigate the influence of supersonic airflow on the development of a laser ablation pit. Results show that the aerodynamic convection cooling effect not only reduces the ablation velocity but also changes the symmetry morphology of the ablation pit due to the non-uniform convective heat transfer. Flow mode transition is also observed when the pit becomes deeper, and significant change in flow pattern and heat transfer behavior are found when the open mode is transformed into the closed mode.

High-power laser resistance of filled sandwich panel with truss core: An experimental study

“…In addition, airflow causes pressure difference between two surfaces of thin-plate targets, leading to a premature rupture at the temperature well below the melting point [27]. Numerical analyses are also performed to examine the laser damage of composite materials in supersonic airflow [28].…”