增压器工作转速极高，在工作时会出现转速急剧上升的情况，若叶轮破裂，将对增压器造成灾难性后果。在产品研发前期，利用数值模拟方法获得压气机叶轮的最高失效转速有着重要的意义。开展叶轮材料2A70拉伸试验，建立材料弹塑性本构模型，为叶轮仿真模拟提供材料边界。通过压气机叶轮的超转速破坏试验和压气机叶轮的仿真模拟研究，提出基于Mises应力、主塑性应变和等效塑性应变能3种叶轮失效转速预测方法，并对3种方法进行分析比较。研究结果表明：Mises应力预测失效转速的方法精度最高，相对试验偏差为4.2%；等效塑性应变能和主塑性应变预测失效转速的方法偏差相对较大，相对试验偏差分别为6.9%和8.8%；3种预测方法最大失效转速均偏大。

The working speed of supercharger is extremely high and hence a sharp rise of speed at operation is thoroughly possible. If the impeller is broken, it will cause disastrous consequence to supercharger. So it is of great significance to obtain the maximum failure speed of compressor impeller by numerical simulation in the early stage of product development. The tensile test of 2A70 impeller material was carried out and the elastic-plastic constitutive model was established to provide material boundary for impeller simulation. Based on the overspeed failure test and simulation of compressor impeller, three kinds of prediction methods for failure speed were proposed based on Mises stress, principal plastic strain and equivalent plastic strain energy and the comparison was conducted. The results showed that the Mises stress method had the highest accuracy and the relative error was 4.2%. The prediction error for equivalent plastic strain energy and principal plastic strain method was 6.9% and 8.8% respectively and it was relatively larger. The maximum failure speeds for all the three prediction methods were slightly large.