STRESS ANALYSIS OF STEAM TURBINE BLADE DURING START-UP

Abstract

In this report, we have performed fluid structure interaction (FSI) simulation for a steam turbine blade. Steam turbine blade geometry is created on CAD software with aerofoil shape. Then the geometry is imported into Ansys R18.1 software from CAD software. After this, CFD analysis of the turbine blade is performed with hot steam passing over the blade and cold water passing through the hollow section of the blade for cooling purposes. Thermal load, pressure load and centrifugal load is considered in CFD analysis. After the CFD analysis, FEA analysis is performed for the same geometry. Pressure load, thermal load, centrifugal load and gravitational load are considered in FEA analysis. Pressure load and thermal load are extracted from CFD software to FEA software. Von mises stress and deformation of the blade are obtained as results from FEA analysis. This entire FSI analysis is performed on turbine blade for two operating conditions of turbine, namely, steady state and transient state (start-up). After obtaining FSI results for both the analysis, results are compared and conclusions are made.