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空气光学击穿的激波流场结构的研究是激光与物质相互作用研究领域中的重要组成部分。利用光线追踪法,采用解耦的辐射输运方程,数值求解含能量源项的流体控制方程,对空气光学击穿诱导激波的传播过程和随时间演化规律进行了研究。通过线形拟合,给出了激波传播的后期阶段激波半径随时间的变化关系。流场中的超压波形有几个峰值,由多列压缩-稀疏波组成,并且强度越来越弱。研究结果可为激光应用技术提供一定的理论支持。
The research on the structure of the shock wave of air optical breakdown is an important part of the research field of the interaction between laser and matter. Using ray tracing method, the decoupled radiative transport equations are used to numerically solve the fluid governing equation with energy source term. The propagation process and evolution of shock wave induced by optical breakdown are studied. By linear fitting, the variation of shock radius with time in the late stage of shock wave propagation is given. Overpressure waveforms in the flow field have several peaks, composed of multiple columns of compressional-sparse waves, with intensities getting weaker. The results can provide some theoretical support for the application of laser technology.