涡轮榫接结构多层次设计优化方法

针对航空发动机涡轮榫接结构设计优化,根据不同的阶段和要求开展3个层次的优化:二维模型榫接结构基本参数优化、三维带盘模型榫接结构优化以及叶盘结构的气动-结构强度多学科优化.3个层次的优化是迭代进行的,第1层次构建基本的结构参数,第2层次建立在第1层次优化结果之上,同时考虑与轮盘相互影响的重要参数.在第2层次不能达到最优或不满足要求的前提下,开展第3层次的叶盘结构多学科优化研究,通过调整流道等气动参数,达到气动和结构强度两个学科相对最优.结果表明经过优化第1阶段榫接结构最大径向应力降低12.7%,第2阶段轮盘减质量6.9%,第3阶段气动和强度的综合优化效果提升2.4%,得到满足设计要求的榫接结构. 

Multi-level design and optimization of turbine joint structure

For the optimization design of aero-engine turbine joint structure, a 3-step optimization method was developed based on different levels and requirements:basic parameter optimization for 2-D model of joint, joint structure optimization for 3-D model with disk and multidisciplinary optimization of aerodynamics and structural strength for disk. The 3-step optimization process was iterative; in the first step, the basic parameters were built; the secondary step was established on former results, while some important parameters influencing the disk can be taken into account. When the second step cannot meet the requirements or make the best result, the multidisciplinary optimization was conducted, the outlines of turbine flow path were designed according to aerodynamics analysis, and the 3-D turbine blades were introduced. Through the multidisciplinary optimization of aerodynamic and structural strength, the optimum solution can be obtained to realize the relatively best result of the two disciplines. The results show that, after the optimization the max radial stress of the joint structure dropped by 12.7% in the first step, the mass of turbine decreased by 6.9% in the second step and the comprehensive result of aerodynamic and structural strength increased by 2.4% in the third step while meeting the requirements of design.