本项目针对激光致可控环形空泡的产生机理及其动力学特性展开数值仿真和实验研究，旨在为环形空泡的应用提供理论基础和实验参考。采用一种简单易控的新方法产生环形空泡，该方法主要利用高能脉冲激光聚焦到凹洞型靶材内部产生环形空泡。建立基于有限体积法和运动界面追踪算法的数值计算模型，模拟激光致环形空泡的产生与运动过程，得到冲击波引起的压力场变化、环形空泡脉动过程及其引起的流场变化。然后利用图像获取和双光束偏转实验系统对数值模拟结果进行验证，进一步分析环形空泡的产生机理。此外，研究不同的液体参量和激光参数条件下环形空泡的动力学行为，获得环形空泡脉动过程、运动速度和生命周期等与液体密度、粘性、表面张力、温度，以及激光能量、波长、脉冲宽度等的依赖关系。希望通过本项目的研究，实现利用激光参数调控产生具有特定性质的环形空泡，以便应用于微粒子操控、水下激光推进等领域。

In this project, mechanism and dynamics of controllable toroidal bubble induced by laser are studied numerically and experimentally, with the aim of providing fundamental basis and experimental references for application of laser-induced toroidal bubbles. A simple and controllable method is proposed to generate toroidal bubbles, which is induced by focusing high intensity laser pulse into cavity target. We develop a simulation mode based on finite volume method and volume of fluid method to study the generation and movement of toroidal bubble, obtaining the change of pressure field from shockwave and the change of velocity field from the toroidal bubble. After that, the simulation results are verified by experiments based on photography and double beam deflection method, and then the mechanism of toroidal bubble induced by laser is discussed deeply. Moreover, we will investigate the influences of liquid parameters, including liquid density, viscosity, surface tension and temperature, and laser parameters, including intensity, wavelength and pulse width, on the dynamic behavior of toroidal bubble, such as oscillations, velocity and life time. The outcome of this project will be helpful to generate controllable toroidal bubble by adjusting laser parameters for relative applications, such as micro particle handing and underwater laser propulsion.