基于三维热弹性接触的汽轮机调节级叶片枞树型叶根轮缘结构的优化  

Design Optimization of Fir-tree Root and Rim for Control Stage Blades Considering 3D Thermo-elastic Contact Problems

作　　者：张明辉[1] 张荻[1] 谢永慧[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《动力工程学报》2012年第7期501-507,516,共8页Journal of Chinese Society of Power Engineering

摘　　要：在考虑高温热变形影响的前提下,对汽轮机调节级叶片枞树型叶根轮缘结构进行了优化研究.采用有限元分析软件Ansys的参数化设计语言APDL建立了枞树型叶根轮缘的参数化模型,以叶根轮缘的8个关键尺寸作为设计变量,以叶根轮缘处最大等效应力达到最小为目标函数,应用模式搜索算法进行优化控制,对叶根轮缘结构进行多变量的优化分析,获得了使叶根轮缘处最大等效应力大幅减小的枞树型叶根轮缘优化型线.结果表明:相对于原始结构,优化后,叶根和轮缘处的最大等效应力分别降低了19.84%和6.48%,提高了汽轮机运行的可靠性.The research on optimization of fir-tree root and rim for turbine control stage blades was conduc ted in eonsideration of high temperature thermal deformation. A parametric model for the fir-tree root and rim was established based on the parametric design language APDL from the finite element software Ansys, with which multivariable optimization was carried out for the structure of the root and rim using pat-tern search algorithm, by taking 8 critical geometrical parameters as design variables and the maximum equivalent stress of the root and rim as objective function, and hence an optimized structure obtained at the premise that the maximum equivalent stress was evidently reduced. Compared with the original structure, the maximum equivalent stress of the optimized root and rim can be reduced by 19.84% and 6.48% respec- tively, resulting in increased operation reliability of steam turbines.

关 键 词：结构优化 有限元分析 枞树型叶根轮缘 模式搜索算法 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]