Experimental 1MW steam turbine in double-rotor configuration

Abstract The article describes a test rig for the experimental verification of the superheated steam flow through the control and follow-up stage of an experimental steam turbine placed in Doosan Škoda Power laboratory. Due to the innovative solution concept, the turbine is equipped with two mechanically independent rotors and the possibility to measure the performance of the control and follow-up stage separately. In the case of the control stage, it is also possible to simulate the partial admission by covering part of the inlet cross-section and to determine the energy loss by the presence of partial admission. In a wide range of rotational speeds of one or both rotors and steam inlet and outlet pressures and steam inlet temperature, local values of efficiency, stage reactions, Mach and Reynolds numbers and losses in the inter-stage channel can be determined by measurement for both stages separately. It is possible to probe the flow fields along the blade length before and behind second stage. Experiments, including probing, can be carried out at a steam pressure of up to 3.5 bar(a) and a temperature of up to 300 °C. The obtained data are used for tuning and verification of 3D CFD simulations and for corrections of the in-house SW system for the design of flow paths.