关键词: 激光引致激波;激波传播;光线追踪法;能量源项

Abstract: In the investigation of laser material interaction,the proper description of the shock wave flow structure after air optical breakdown plays an important role. With the ray tracking method,the decoupled radiation transfer equation is used to study the propagation process and the change law of the laser-induced shock wave by numerically solving the control equations containing energy source term. The function relationship of the shock wave radius with respect to time in the later period has been obtained by linear fitting. The temporal overpressure wave form shows that it contains more than one peak points and it comprises many compression-expansion waves,which decay slowly. The results may provide some theoretical support for laser application technology.

Key words: Laser-induced shock wave;Shock wave propagation;Ray tracking method;Energy source