车用涡轮增压器叶轮破裂转速的弹塑性数值分析

基于ANSYS有限元分析软件,对车用涡轮增压器涡轮叶轮和压气机叶轮进行了材料非线性弹塑性有限元数值分析,计算了涡轮叶轮和压气机叶轮在离心载荷作用下的破裂转速,并与试验结果进行了对比。结果分析表明,建立在弹性基础上的叶轮破裂转速预估方法不够准确。考虑材料非线性的弹塑性计算更接近实际结果,可以应用于叶轮的强度校核和结构优化。破裂转速的计算结果表明,涡轮叶轮的强度储备大大高于压气机叶轮的强度储备,对其进行结构减重设计或优化十分必要。

Elastoplasticity Numerical Analysis of the Burst Speed of Vehicular Turbocharger Impeller

Taking into consideration the material nonlinearity of turbocharger compressor impellers and turbine wheels, we carry out elastoplasticity numerical analysis of their burst speed based on FEM software ANSYS. Comparing the test results with the elastic calculating results, we find that the estimated burst speed based on elastic calculation is inaccurate, and elastoplasticity numerical analysis results is more close to the test results. Calculating results indicate that the margin of safety of the turbine wheel is greater than that of the compressor impeller, weight- losing design or optimization should be carried on for the turbine wheel, and elastoplasticity numerical analysis should be applied to intensity design and structure optimization.