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首页> 外文期刊>Optik: Zeitschrift fur Licht- und Elektronenoptik: = Journal for Light-and Electronoptic >Time-resolved temperature field and fluid velocity field numerical simulation of plasma generated by long pulse laser induced transparent medium
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Time-resolved temperature field and fluid velocity field numerical simulation of plasma generated by long pulse laser induced transparent medium

机译：长脉冲激光诱导透明介质产生的等离子体的时间分辨温度场和流体速度场数值模拟

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摘要

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.
机译：激光负载的燃烧波（LSCW）存在于对熔融二氧化硅的激光造成损伤的过程中。基于单脉冲激光器支撑的燃烧波，脉冲激光的燃烧过程在阶段进行建模和模拟，考虑了第一和多个激光脉冲的温度残余，靶形态的变化的影响飞溅材料的分布，以及目标表面气流条件的分布。通过建立二维轴对称气体动态模型，模拟了包括逆勃尔森辐射，热辐射，导热和对流过程的激光能量转移过程。仿真结果表明：在并联激光束的动作下，燃烧波的传播是稳态，气体动力学行为稳定，在聚焦激光束的动作下，燃烧波的传播不稳定。燃烧波的扩展速度和气体动态结构与实验结果和理论结果吻合良好，这验证了理论模型的正确性。

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