Optimization Design of Steam Turbine Rotors based on Thermo-Structural Coupling

Zewen Li

doi:10.6919/ICJE.202606_12(6).0018

Authors

Zewen Li

DOI:

https://doi.org/10.6919/ICJE.202606_12(6).0018

Keywords:

Steam Turbine Blade; Original Model; Prestressed Modal Analysis; Thermo-Mechanical Coupling; Static Creep; Stress Concentration; Service Safety.

Abstract

This study focused on the original model of a first-stage shrouded steam turbine blade and investigated its mechanical behavior under a multiphysics environment through prestressed modal analysis, transient thermo-mechanical coupling analysis, and long-term static creep analysis. The results showed that the system exhibited nodal-diameter vibration, with a first-order natural frequency of 588.88 Hz, satisfying the requirements for dynamic stability. Under steady-state conditions, the maximum equivalent stress reached 345.09 MPa and was mainly located in the shroud connection region. After service for 6.8×10⁸ s, the equivalent creep strain at the blade root accumulated to 0.19073 mm. This study identified the structural strength bottlenecks and deformation characteristics of the blade, providing a reference for the safe service of this type of turbine blade.

Downloads

Download data is not yet available.

References

[1] Wang, Z. (2019). Fatigue–creep life prediction method for turbocharger turbine blades. China Mechanical Engineering, 30(21), 2521.

[2] Han, Z. X. (2005). Experimental study on the effect of blowing ratio on film cooling characteristics of a gas turbine flat plate. Proceedings of the CSEE, 25(18), 91.

[3] Zhao, W. S. (2016). Study on vibration characteristics of last-stage steam turbine blades. Journal of South China University of Technology (Natural Science Edition), 44(8), 8.

[4] Shen, X. L., Gao, P. X., Dong, S. J., et al. (2020). Contact stress calculation and static strength analysis of blades with serrated shrouds. Journal of Aerospace Power, 35(4), 732–743.

[5] Liu, Y. H., Wang, Y. R., Wei, D. S., et al. (2025). Simulation of creep deformation of turbine blades and analysis of the influence of deviation angle. Journal of Aerospace Power, 40(6), 20230402–20230414.

[6] Chen, S., Xu, H. M., Sun, K., Xu, Y. H., & Zhang, Y. S. (2025). Prediction of creep strain of turbine blades based on finite element nodes. Journal of Beijing University of Aeronautics and Astronautics, 51(11), 3822–3832. https://doi.org/10.13700/j.bh.1001-5965.2023.0639

[7] Sun, Y. J., Zhu, Y. H., Kang, L., Zhang, R. Z., Tan, J. P., Wen, J. F., & Liu, C. L. (2025). Digital twin model for creep–fatigue life prediction of turbine disks[EB/OL]. Retrieved April 29, 2026, from https://journal.ecust.edu.cn/article/doi/10.14135/j.cnki.1006-3080.20250106002. https://doi.org/10.14135/j.cnki.1006-3080.20250106002