中文摘要：

为获得汽轮机叶片在高速水滴撞击下的应力状况，从而为进一步研究汽轮机叶片水蚀提供撞击应力等基础参数，该文建立了高速水滴与叶片钢撞击模型。模型中采用光滑粒子动力学无网格方法描述水滴部分、常规有限元有网格方法描述叶片钢材部分，充分考虑了水滴与钢材间的流固耦合效应，研究了多种速度和粒径的水滴对叶片的撞击情况，得到了水滴内部的瞬态压力分布以及水滴撞击以后的压缩、扩展、飞溅的情况，叶片钢内部应力影响区域以及应力随时间的变化，撞击应力与水滴尺寸和撞击速度的关系等。与文献果的对比表明：文中的分析结果是合理的，试验结相关参数可以应用于汽轮机叶片的水蚀疲劳研究。

英文摘要：

In order to obtain stress of blade steel with high speed water droplet impact and provide basic parameters to study liquid corrosion of steam turbine blade, numerical model was developed to study high speed water droplet-blade steel impact. In the model. smoothed particle hydrodynamics （SPH） method was adopted to describe water droplet, and the conventional finite element method was used to discretize the blade steel. The effect of fluid-structure interaction between water droplet and steel was considered. Impact cases with different speeds and droplet diameters were investigated, and the transient pressure inside water droplet was obtained. Meanwhile, compression, expansion and splash of water droplet were described. On the other hand, the transient stress and its affect region inside blade steel, the variety of impact stress with different diameter and impact speed water droplets were obtained. The numerical results show rationality compared with the experimental data provided by other scholars, so the results can be used for liquid corrosion fatigue analysis of steam turbine blade.