Prediction of unsteady loading on a steam turbine blade
نویسندگان
چکیده
A single rotor CFD model using wall-modeled Large Eddy Simulations (LES) was performed to predict the unsteady loading on the blade surface under partial admission. Geometry of the rotor blade of high pressure steam turbine of a 500 MW fossil-fuel power plant was used for this study. Periodically changing inlet boundary model was developed for single rotor model to simplify a full annular of the turbine. Single rotor model using LES showed a macroscopic pattern of excitation forces similar to the results of the twostage full annular model using URANS (Unsteady Reynolds Averaged Navier-Stokes). Moreover, our LES model can capture the high-frequency fluctuation of forces on the blade. A corrected non-reflecting boundary condition was used to determine the amount of peak force around the border of the inactive arc.
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