大型空冷汽轮机叶片动应力分析  

Dynamic Stress Analysis of Air-cooling Steam Turbine Blade

作　　者：秦飞[1] 张晓峰[1] 李英[2] 

机构地区：[1]北京工业大学 机械工程与应用电子技术学院,北京100022 [2]中国寰球工程公司,北京100029

出　　处：《北京工业大学学报》2006年第7期577-581,共5页Journal of Beijing University of Technology

摘　　要：提出了一个整圈叶片动应力的简化计算模型,采用该简化模型和瞬态有限元方法计算了空冷汽轮机末级动叶片的动力学响应,分析了不同工况下的动应力值．同时采用谐响应分析方法研究了叶片危险点在不同激振频率下的位移响应,得出在设计空冷机组叶片时应考虑避开第4～7阶共振频率的结论．An alternative simple model was proposed to compute dynamic stress in the blades of steam turbines. By the model and transient finite element method, dynamic stress in the last stage rotating blades of a air cooling steam turbine under various back-pressure was analyzed under centrifugal loads and steam pressure obtained by 3-D transient fluid analysis. Dynamic displacement response of dangerous points in the blade was also discussed by the harmonic response analysis. The results suggest that the 4th-7th resonant frequencies should be avoided inthe design of those kinds of blade.

关 键 词：汽轮机叶片 动应力 有限元 谐响应分析 

分 类 号：O343.3[理学—固体力学]