涡轮叶片蠕变变形模拟及偏离角影响分析

Based on the macroscopic phenomenological creep model, the finite element subroutine was compiled to simulate and analyze the creep deformation behavior of real turbine blades. In the engineering practice, through simulation of creep deformation in service environment, the important assessment positions of turbine blades were determined. Considering the effect of creep, the stress relaxation effects on the concentration positions were analyzed, and the prediction endurance life of the verifying positions with/without stress relaxation was compared. By changing the deviation angle between the crystal axis and the blade height direction, the allowable deviation angle in the engineering application was simulated. These results indicated that the important assessment positions of turbine blades were generally located at the root of the spoiler columns and the corner of the cooling channels. The stress relaxation phenomenon occurred at these positions with the creep progresses, affecting the prediction endurance life of turbine blades. The tolerance of deviation angle in engineering was designed as 10°, beyond which the creep performance of turbine blade material decreased significantly.