Stator clocking effect investigations in a two-stage turbine

Experimental investigations of external characteristics and the detailed flow structures in a two-stage low-pressure turbine were conducted. The objective of this study was to gain more insight into unsteady flow phenomena affecting flow behaviour due to the stator wake clocking effects in multi-stage machines. A clocking mechanism allows the first stator to be moved relative to the second stage stator. Analysis of the experimental results includes turbine performance as well as steady and unsteady flow measurements throughout the flow field for different circumferential positions of both stators. A global review of the clocking effect is presented.