Abstract: In order to acquire the more real and detailed stress status of a centrifugal compressor impeller with splitter blade , three-dimensional entity model was established. One-way fluid-solid interaction analysis was canied out by the fluid dynamics and the finite element method. The three-dimensional flow field model of one-tvvay passage and the stmcture finite element model for the impeller were established. The interfaces belween the software were used 10 realize the pressure dala transfer between flow field and stmcture field. Maxi flmm stress and strain distribution of the impeller , which was gained by the simultaneous effect of the centrifugal and aerodynamic force , were acquired. And lhe analysis and calculation of lhe stalic strength of the impeller was finished and the reliability of impeller strength of was proved. The modal analysis was caITied out on the static results. The influence of rotation speed on natural frequency was analyzed , and a resonance point at the common rotation speed was also presented.

Key words: vehicle engineering, centrifugal compressor, fluid-solid coupling, stress, modal analysis, resonance

摘要： 为了获得某带分流叶片的离心式压气机叶轮更为真实详细的应力状态，建立三维实体模型；采用流体动力学和有限元方法，对其进行单向流固耦合分析，构建叶轮单通道三维流场模型和结构有限元模型；利用软件之间的接口，实现了流场与结构场之间的压力数据传递，获得离心力和气动力共同作用时的叶轮最大应力和应变的分布，进而完成叶轮静强度的分析计算，并验证了叶轮强度的可靠性；利用静力结果进行模态分析，分析了转速对固有频率的影响，得到在常用转速下的共振点。

关键词: 车辆工程, 离心式压气机, 流固耦合, 应力, 模态分析, 共振