高负荷弧形轮毂涡轮盘结构分析与优化

Structure Analysis and Optimization of Heavy Duty Contoured Bore Turbine Disk

为减轻涡轮盘质量,满足发动机更高推质比的需求,通过ANSYS有限元方法对高负荷弧形轮毂涡轮盘进行了优化分析。从质量和应力两方面对k从0~0.26(k为弧线内凹深度H与轮毂宽度W之比)的涡轮盘进行对比分析。结果表明:(1)随着k的增大,应力分布更均匀且最大周向应力先减小后增大(k=0.12为拐点),平均径向应力和质量减小,但最大径向应力小幅度增大,Von-Mises等效应力因轴向应力的影响有小幅度增大。(2)研究范围内,k=0.12的涡轮盘最优,与传统涡轮盘(k=0)相比,最大周向应力减小11.13%,最大径向应力和Von-Mises应力虽分别小幅增大1.87%和6.49%,但涡轮盘减质3.10%,安全系数均满足要求,提高了材料的利用率与发动机性能。

In order to lighten weight of turbine disk and satisfy the need of higher engine thrust-mass ra- tio, the optimization analysis of the heavy duty contoured bore turbine disk was conducted with the finite element method of ANSYS. The contoured bore turbine disks with different k （0≤k≤0.26） , the ratio of the contoured depth H to the disk bore width W, were analyzed and compared in terms of mass and stress. It is found that , with the increase of k, the stress becomes more uniform and the maximum circumferential stress decreases and then increases （k=0.12 is the turning point）, the average radial stress and mass reduce, but the maximum radi- al stress increases slightly, the Von Mises equivalent stress also increases a little due to the influence of the axial stress. The disk with ratio k=0.12 was the optimal turbine disk, eompard to the conventional disk （k=0） , the maximum circumferential stress greatly decreases by 11.13%, though the maximum radial stress and Von Mises equivalent stress slightly increase by 1.87% and 6.49% respectively, the mass decreases by 3.10%, and the safety factor meet the strength design requirements, which improves the utilization of the material and the perfor- mance of the engine effectively.