涡轮盘/榫整体结构优化设计方法

考虑到榫联接和轮盘子午面在结构设计时的相互影响,针对典型的枞树型榫联接,提出了通用的榫联结构/轮盘子午面分步优化设计、总体协调的涡轮盘/榫整体结构优化设计方法.基于ANSYS优化平台及参数化建模技术,筛选了优化设计变量,以涡轮盘/榫整体结构总质量最小为优化目标,以涡轮盘/榫联结构关键应力为约束,建立了涡轮盘/榫整体结构优化设计的数学模型.通过对某型发动机涡轮盘和榫联结构设计方案进行结构优化设计,在满足所有几何约束及强度要求的条件下,二齿及三齿盘/榫结构优化后总质量都有明显降低,说明涡轮盘/榫整体结构优化设计方法的合理性;且二齿盘/榫结构的总质量较三齿盘/榫结构明显减小,榫槽底部最大第一主应力也明显降低.任意榫齿数可选的通用涡轮盘/榫整体结构优化设计方法及平台可适用于不同涡轮的结构设计,具有较强的工程实用性.

Method of structural optimization design for turbine disk/tenon

Considering the effect between tenon joints and meridional section of disk in structure design,a general method of structural optimization design for turbine disk/tenon was presented,including designing tenon joints/meridional section of disk in stages and synthetically optimizing with coordination.Based on ANSYS platform and parametric modeling technique,optimization design variables were chosen and a mathematic model of structural optimization design for turbine disk/tenon was established for the purpose of getting minimum masses with all constrained stresses of turbine disk and tenon joints being met.The results of the structural optimization designs of turbine disk and tenon joints for an aero-engine show that the mass of two-tooth and three-tooth disk/tenon are both decreased obviously after optimization under the condition of meeting geometry and strength requirements,which verifies the rationality of the method;the results also reveal that the structure of two-tooth disk/tenon is less mass and the maximum first principle stress lower than that of three-tooth disk/tenon.This method and platform of structural optimization design for turbine disk/tenon with any number of teeth were applied to structure designs of different turbines,which demonstrated a high engineering application.