中文摘要：

基于光滑粒子流体动力学（Smoothed Particle Hydrodynamics，SPH）耦合有限元法（Finite Element Method，FEM），利用LS-DYNA对脉冲射流辅助支撑工件过程进行数值模拟，研究了脉冲射流冲击力和径向流特性．对比了不同头部结构和冲击角度对射流冲击力的影响，分析了射流冲击下工件的损伤。结果表明：射流头部与靶板的接触面积越小，水锤阶段的冲击力也越小；冲击角度减小时，垂直于靶板方向上的冲击力分量大幅度减小，水平方向上的冲击力分量小幅度增大，射流冲击力不能根据正交分解法求解；虽然径向流速度较大，但由于径向流分布稀疏不均,其冲击靶板的力只有射流自身冲击力的1／3,一般情况下不足以损伤工件材料。

英文摘要：

Based on the algorithm of Smoothed Particle Hydrodynamics （SPH） coupled with Finite Element Method （ FEM）, the process of pulsed water-jet assisted supporting workpiece was simulated by using LS-DYNA. The characters of jet impact force and radial flow was studied. The influence of head structure and impact angle on jet impact force was compared. The damage to workpiece under jet impact was analyzed. The results show that the smaller the contact area between jet head and target is, the smaller the impact force at the stage of water hammer is. With impact angle decreasing, the impact force component in the direction perpendicular to target is greatly reduced, while the impact force component in the horizontal direction is increased by small degree. The jet impact force cannot be solved by the orthogonal decomposition method. Though the velocity of radial flow is large, the distribution of radial flow is sparse and scattered. The impact force of radial flow is only 1/3 of the impact force of jet itself, which is not enough to damage the material of the workpiece generally.