基于Patran和MSC Nastran的某空压机第1级叶轮强度分析及结构优化

基于Patran和MSC Nastran，采用三维有限元法分析某型空压机第1级叶轮在工作转速下的强度，并优化叶轮结构.研究结果表明：原叶轮在叶片进气边分别与轴盘和盖盘的焊接处出现高离心应力区域；原叶轮设计模型的最大应力为970 MPa，与材料抗拉强度试验平均值1 066 MPa相差9%，安全裕量不足.优化设计后的叶轮模型的最大应力为864 MPa，与材料抗拉强度试验平均值1 066 MPa相差19%，安全裕量提高1倍.

Strength analysis and structure optimization on first stage impeller of air compressor based on Patran and MSC Nastran

Based on Patran and MSC Nastran, the 3D finite element method is used to analysis the first stage impeller of an air compressor and the impeller structure is optimized. The results show that there are some high centrifugal stress areas of the original impeller at the welds between the blade leading edge and the hub/shroud disk; the maximum centrifugal stress of the original impeller is 970 MPa, which is 9% lower than the average value(1 066 MPa) of tensile strength tests and the safety margin of the original impeller is deficient. The maximum centrifugal stress of the optimized impeller is 864 MPa, which is 19% lower than the average value(1 066 MPa) of tensile strength test. The safety margin of the optimized impeller is improved by 100%.