Vortex interactions in an hp turbine rotor and their effect on stage performan

The paper presents a CFD analysis of the process of development and mutual interactions of vortex structures in an HP turbine rotor and its effect on stage performance. Two stages selected for examination revealed different efficiency levels and loss distribution patterns. In the low-efficiency stage the analysis, performed in a steady-state mode on a fine-resolution grid, made it possible to trace the interaction of a horseshoe vortex with the separation structures forming in the rear part of the rotor passage, and evaluate the resultant fluctuations of stage performance parameters.