摘要
以航空发动机燃烧室机匣轻量化设计需求为牵引,建立了可变壁厚减轻质量(简称减质)优化方法,以单元壁厚为设计变量,设计域总应变能最小作为优化目标,体积分数作为约束条件,开展机匣本体优化设计,实现了壁厚更优分布;进一步基于变密度拓扑优化设计方法,以单元密度为设计变量,柔度最小为优化目标,结构的减质体积分数作为约束条件,开展了机匣安装座与法兰边减重优化设计。两种优化方法各有优化对象、优化阶段的侧重,前者更适用于初步设计阶段,获得良好的最初壁厚分布,后者适用详细设计阶段,进行局部结构轻量化设计。减质优化设计成功通过了压力考核试验,验证了优化方法的有效性及可行性。
A thickness optimization design method is established for the lightweight design requirement of aero-engine combustor case.The thickness of each element is taken as design variable.The optimization objective is the total strain energy of design domain.An optimal thickness distribution is achieved by the thickness optimization design method in this paper.For the weight reduction optimization mount of combustor case and flange,topology optimization based on variable density method is used.The density of element is taken as design variable and the flexibility is taken as the optimization objective.The two methods have their own features.The former method is more suitable for the preliminary design stage to obtain a good initial wall thickness distribution,while the latter is suitable for the detailed design stage to carry out local structure lightweight design.Finally the load carrying capacity of the optimized design is verified by the pressure test,which shows the effectiveness and feasibility of the approaches proposed.
作者
许璠璠
杨眉
柴象海
阎琨
倪晓琴
Xu Fanfan;Yang Mei;Chai Xianghai;Yan Kun;Ni Xiaoqin(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China;Dalian University of Technology,Dalian 116024,China)
出处
《航空科学技术》
2021年第12期27-34,共8页
Aeronautical Science & Technology
基金
国家重点研发计划(2018YFB1106400)。
关键词
航空发动机
燃烧室机匣
轻量化设计
拓扑优化
壁厚分布优化
aero-engine
combustor case
lightweight design
topology optimization
thickness distribution optimization
