热力透平2025，Vol.54Issue(2)：79-84,6.DOI:10.13707/j.cnki.31-1922/th.2025.02.001
深度调峰下汽轮机末级叶片颤振特性研究
Study on Flutter Characteristics of Last-Stage Blades in Steam Turbines Under Deep Peak Shaving Conditions
刘玉鹏 1谢永慧 1孙奇 2范志飞2
作者信息
- 1. 西安交通大学 能源与动力工程学院,西安 710049
- 2. 东方汽轮机有限公司,德阳 618000
- 折叠
摘要
Abstract
Under deep peak shaving conditions,the flow state of the last stage of steam turbine is complex,and the blades are prone to aero-elastic instability.A blade flutter analysis method based on influence coefficient method was established,and by calculating the energy interaction between the blade and the surrounding fluid during the vibration process,the flutter characteristics of the long blades in the last stage of a steam turbine under deep peak shaving condition were analyzed.The aerodynamic damping under different orders and pitch numbers of vibration was obtained,and the aero-elastic stabilities of blades under different load conditions were compared.The results are as follows:the aerodynamic damping in both 50%Thermal Heat Acceptance(THA)and 20%THA load conditions is positive,and aero-elastic instability will not occur;under 50%THA condition,the aerodynamic damping is the smallest at the 4th mode and 3rd pitch number,with a value of 0.000 38;under 20%THA load condition,the aerodynamic damping is the smallest at the 3rd mode and 2nd pitch number,with a value of 0.000 32;for the first three mode vibrations,the aerodynamic damping under 20%THA condition is significantly lower than that under 50%THA condition.Steam turbine long blades tend to experience flutter instability under low order vibrations,which indicates that as the load decreases,the aero-elastic stability of the long blades in the last stage of the steam turbine becomes worse.The research results can provide reference for the safety assessment of steam turbine under deep peak shaving conditions.关键词
深度调峰/气动阻尼/末级叶片/影响系数法/颤振Key words
deep peak shaving/aerodynamic damping/last stage blades/influence coefficient method/flutter分类
能源与动力引用本文复制引用
刘玉鹏,谢永慧,孙奇,范志飞..深度调峰下汽轮机末级叶片颤振特性研究[J].热力透平,2025,54(2):79-84,6.
