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The article analyses the unsteady interaction of vortex structures in a turbine rotor passage. In the form of sample cases, two high-pressure steam turbine stages are examined: a standard stage, used as the reference, which reveals regular performance characteristics and distributions of flow parameters, and a low-efficiency stage, in which a large separation zone is observed in the rear part of the rotor passage. In the latter case the combined interaction of all vortices has been found todoi:10.2478/v10012-008-0021-9 fatcat:fxl6i4uo7netfedooytou72oqi