Investigation of Blade Tolerances Effect on Efficiency, Using 1D Modeling of an Axial Flow Turbine

Turbine blades always face inevitable fault and Tolerances, which cause the final blade geometry differs from the designed one. On the other hand, blade geometry has important effects on turbine performance causing blade dimensional faults influence turbine major characters, like efficiency. The mentioned situations cause turbine performances vary from its optimum condition. So, obtaining allowable geometrical tolerances having effect on turbine efficiency is necessary. The most influential factors leading to these errors are various fabrication methods and geometrical changes during turbine operation. The most important of these can be pointed to maximum thickness, chord length, and blade height tolerances. In this research, through one-dimensional modeling, Hanover axial flow turbine efficiency changes from its design point due to dimensional tolerances is studied. Ainely-Mathieson, Dunham-Came, and Aungier loss models were applied in this modeling.