在强激光与水介质作用过程中,等离子体和冲击波的形成机理是人们关心的主要问题之一。采用双脉冲激光纹影摄影法,获得了强激光作用时水中的冲击波流场图形,建立了激光与水作用两相流计算模型,建模时考虑了激光吸收,水体汽化、等离子体形成和膨胀等过程。对强激光作用水体形成冲击波的过程进行了数值模拟计算,获得了与实验相符的计算结果。进一步分析了激光诱导等离子体冲击波的传播特性,并与经典理论模型结果进行了比较。研究结果表明,在激光作用下,水中等离子体快速膨胀形成的冲击波传播初始速度高达上千米每秒,压力约为十几吉帕,随后冲击波的速度和压力迅速衰减,1 ms后衰减到声波速度。 In the process of strong laser and water medium, the formation mechanism of plasma and shock wave is one of the main concerns. The double-pulse laser schlieren photography method was used to obtain the shock wave field in strong water laser. The two-phase laser and water flow calculation model was established. The laser absorption, water vaporization, plasma formation and expansion Other process. The formation of shock waves by the action of intense laser is numerically simulated and the experimental results are obtained. The propagation characteristics of laser-induced plasma shock wave are further analyzed and compared with the classical theoretical model results. The results show that under the action of laser, the initial propagation velocity of shock waves formed by the rapid expansion of plasma in water is as high as several thousand meters per second and the pressure is about a dozen gpa. The speed and pressure of the shock wave then rapidly decay, and then attenuate to the sound wave after 1 ms speed.