中文摘要：

微水射流导引激光束精密加工是一项世界性的前沿技术,综合了激光加工和水射流切割的优点,具有相当优异的加工性能。本文从工程热物理和流体力学基础出发对此过程中的流动现象进行分析,研究微水射流导引激光束精密打孔的动力学过程,采用有限体积法（Finite Volume Method）建立了描述其间物理过程的数值模型。对打孔过程中熔池内部的流动和传热进行了模拟和分析,得到了不同时刻熔池内的温度和流场分布,计算结果显示：孔刚形成时孔的传播速率要大于停滞区界面的传播速率;随着孔的加深,停滞区界面停止向孔的内部传播。

英文摘要：

Micro-waterjet guided laser processing is an internationally advanced technique based on guiding a laser beam inside a thin,high-speed waterjet.This process combines the advantages of laser processing with those of waterjet cutting.The study gives insight into dynamic process of micro-waterjet guided laser drilling process,analyzes the heat transfer and flow structure based on engineering thermophysics and flow dynamics theories.The physical and mathematical models were developed to present this drilling process using Finite Volume Method.The flow field and the temperature distribution in the melting pool and drilling cavity at different moments were calculated.The penetration speed of cavity is higher than the moving speed of stagnation zone interface at the beginning for cavity forming,and then the stagnation zone suspends to move with cavity deepening.