Aerodynamic Optimisation of Highly Loaded Turbine Cascade Blades for Heavy Duty Gas Turbine Applications
In the present work a method for the automatic aerodynamic optimisation of turbine cascade blades for high pressure stages of heavy duty gas turbines is presented. This class of profiles features aerodynamic and geometric properties which strongly depart from those encountered in aero engines. Thus extensive experimental investigations were performed at the High Speed Cascade Wind Tunnel of the University of the German Armed Forces Munich on various turbine cascade blades representative for this kind of application at realistic turbomachinery conditions. The developed tool is conceived for the application in an industrial framework and design time scales compatible with industrial requirements were considered as well. In this context a method consisting of a two-dimensional RANS approach combined with a parametric geometry generator and an optimisation algorithm is proposed. The comparison of the numeric optimisation results with the experimental reference data attests the high improvement potential introduced by the developed procedure.