0404 Investigation of the influence of unsteady flow field and purge air on the aerodynamic performance of a single turbine stage

Abstract

This paper presents experimental and numerical simulation study of single turbine stage flow field with injected purge air. To investigate the influence of the purge air from the Rim-seal cavity, we conducted 5-Hole probe and Slant-type hot wire probe traverse measurement downstream of the rotor blade. Those measurement results were used to validate the numerical simulation data then we described the flow field of the rotor passage and cavity domain. In the case of injected purge air, Rim-seal cavity flow field tend to non-uniform and we observed unsteady vorticity distribution around cavity outlet. Those flow filed entrained streamwise vorticity and entropy generation rate in the rotor passage.