复杂阻尼结构汽轮机末级长叶片寿命评估相关研究进展及展望

目前汽轮机叶片设计和安全性考核主要采用的是以许用应力为基准的静强度准则和以安全倍率为基准的动强度准则,随着汽轮机设计制造水平的提高,尤其是近年来在超临界和超超临界大功率汽轮机中广泛采用具有复杂阻尼结构的长叶片,该方法已经表现出越来越多的局限性,建立一套从寿命损耗角度评估叶片安全性的方法十分必要。总结了近年来国内外在叶片寿命评估相关研究如静态应力分析、动态应力分析、叶片高周和低周疲劳寿命分析以及叶片水蚀疲劳分析等4个方面的研究进展,并对进一步深入研究提出了一些思路和方法。

Review and Prospect for Life Evaluation of Last Stage Blade with Complex Damper in Steam Turbine

The static strength criterion based on allowable stress and dynamic strength criterion based on safe ratio are usually adopted in design and reliability evaluation for steam turbine blade.With the improvement of design and manufacture of steam turbine,the long blades with complex dampers are used widely in supercritical and ultra-supercritical steam turbine,the previous reliability evaluation method of blade shows limitations,it is necessary to develop a method to evaluate the reliability of blade based on life analysis.The studies such as static stress analysis,dynamic stress analysis,low cycle and high cycle fatigue life analysis and liquid corrosion fatigue life analysis are reviewed,the ideas and methods for further studies are provided too.