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