摘要
运用有限元分析方法对燃气轮机透平叶片的蠕变与低周疲劳进行分析。在三维热模型中获取热边界条件后,开展燃气轮机正常启停工况下针对不同载荷(即离心力、气动和热载)的低周疲劳损伤分析。同时,进行了150000 h的蠕变损伤分析,结合2种典型运行方式对蠕变损伤与疲劳损伤线性累积的总损伤进行了分析。结果表明,热载荷对蠕变损伤的影响最为显著,而离心力的变化对低周疲劳损伤的影响最为显著。对叶片总损伤的考核,需要与运行模式相结合。在长期稳定运行模式下,热载荷的变化对叶片的总损伤有显著影响。在频繁启停运行模式下,离心力载荷的变化对叶片的总损伤有显著影响。该研究为透平叶片设计提供了理论依据,并揭示了不同载荷对叶片总体寿命损伤的影响。
The creep and low cycle fatigue of gas turbine blades are analyzed by finite element analysis method.After obtaining the thermal boundary conditions in the 3D thermal model,a low-cycle fatigue analysis for different loads(centrifugal force,aerodynamic and thermal loads)under normal start-up and shutdown conditions of the gas turbine is carried out.At the same time,the creep analysis of 150000 h is carried out,and the total damage of the linear accumulation of creep damage and fatigue damage is analyzed in combination with two typical operation modes.The results show that the thermal load has the most significant effect on creep damage,and the change of centrifugal force has the most significant effect on low-cycle fatigue damage.The assessment of total blade damage needs to be combined with the operation mode.In the long-term stable operation mode,the change of thermal load has a significant effect on the total damage of the blade.In the frequent start-up operation mode,the change of centrifugal force load has a significant effect on the total damage of the blade.This study provides a theoretical basis for turbine blade design and reveals the impact of different loads on the overall blade life damage.
作者
何磊
HE Lei(Shanghai Electric Gas Turbine Co.,Ltd.,Shanghai 200240,China)
出处
《热力透平》
2022年第3期202-207,共6页
Thermal Turbine
关键词
低周疲劳
蠕变
蠕变疲劳损伤
透平叶片
low-cycle fatigue
creep
creep-fatigue damage
turbine blade
