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The contribution subscribes a numerical simulation of a steam flow through a balanced control valve. The influence of some parameters in simulations were tested, analyzed and discussed. As a result of the simulations a graph of aerodynamics forces for a specific turbine characteristic was obtained. The results from numerical simulations were compared with results from experiments. The experiment was performed with an air flow, but the final data were converted with a criterion to steam flow.

Recent design of steam turbine stages is based on the use of 3D blades. This paper presents a comparison of experimental results from testing of three variants of this modern bladings with moderate hub reaction. The influence of row density of nozzles was investigated. Comparisons of overall stage efficiency as well as measured flow fields data are presented in the paper.