Research on the Influence of Turbine Blade Fillet Geometry by Strength and Modal Analysis

Turbine blades are subjected to thermal and mechanical loads (CF, aerodynamic, contact)during the typical operation regimes of a gas turbine, such as base load, part-load and low-load. The stress levels at the fillet between the blade airfoil and the inner and outer platform are very significant, as an optimized fillet area represents a compromise between aerodynamic performance, low local stress levels, and stable dynamic behaviour. In this paper, the ANSYS software was applied to study the effects of different fillet geometries on the stress levels and the modal response of a turbine blade. The results provide some reference in the fillet design