Abstract

Laser supported combustion waves(LSCW)exist in the process of laser induced damage to the fused silica. Based on the combustion wave supported by a single-pulse laser, the combustion process of pulsed laser is modeled and simulated in stages, taking into account the effects of the temperature residuals of the first and multiple laser pulses, changes in the target morphology, the distribution of the splash material, and the distribution of the target surface airflow conditions. The laser energy transfer process including inverse bremsstrahlung radiation, thermal radiation, heat conduction and convection processes were simulated by establishing a two-dimensional axisymmetric gas dynamic model. The simulation results show that: under the action of the parallel laser beam, the propagation of the combustion wave is steady-state and the gas dynamics behavior is stable, under the action of the focused laser beam, the propagation of the combustion wave is unsteady. The expanding velocity and the gas dynamic structure of the combustion wave are in good agreement with the experimental results and theoretical results, which verifies the correctness of the theoretical model.

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