Impact of Structural Modifications on Nozzle Box Performance in Steam Turbines
Author Information
Author(s): Mateusz Bryk, Marcin Lemański, Paweł Madejski, Lidija Ćurković, Sonja Jozić, Irena Žmak
Primary Institution: Institute of Fluid-Flow Machinery, Polish Academy of Sciences
Hypothesis
Can structural modifications to the nozzle box improve stress distribution and flow efficiency in steam turbines?
Conclusion
Shortening the nozzle guide vanes significantly reduces stress levels and enhances flow efficiency, leading to increased turbine power output.
Supporting Evidence
- Shortening the nozzle guide vanes by 7 mm reduced stress levels in the nozzle box segments below critical thresholds.
- The modifications led to increased outlet velocities and mass flow rates, enhancing turbine power output.
- Stress levels after modifications were 236.05 MPa for Segment 1 and 249.43 MPa for Segment 2, below the yield strength limit.
Takeaway
By making the blades shorter, the turbine can work better and last longer without breaking.
Methodology
The study used Computational Fluid Dynamics (CFDs) and Thermal–Fluid–Structure Interaction (Thermal–FSI) simulations to analyze the effects of structural modifications.
Limitations
The study relies on numerical simulations, which may introduce inaccuracies, and focuses on a single case study, limiting generalizability.
Digital Object Identifier (DOI)
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