NUMERICAL INVESTIGATION ON THE INFLUENCE OF THE FILLET ON FILM COOLING ROTOR BLADES IN HEAVY DUTY GAS TURBINES WITH AN OBJECT-ORIENTED CFD CODE

摘要

The present paper examines the numerical simulation of the effects of film wall cooling on rotor blades in a high-pressure-ratio axial turbine. Special attention is given to the differently shaped geometries of the fillet at the blade endwall and their influence on secondary flows, since the fillet is often neglected in CFD calculations in order to minimize the effort in grid generation. Simulations were conducted using both sharp and radius edge fillet configurations to investigate the effects on film cooling and secondary flows. For this purpose all simulations were performed using a modified in-house 3D RANS solver based on an object-oriented open-source library. The results were compared against experimental measurements in terms of local quantities such as aerodynamic losses and adiabatic effectiveness.