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Three-dimensional RANS-based numerical simulation of wet steam flow through last stage of a LP turbine has been performed. The stage geometry and flow conditions are defined in accordance with data of full-scale experiments on a LMZ steam turbine with power output of 1200 MW. Calculations have been carried out with the ANSYS CFX 12.1 package. Using the mixing-plane approach and the SST turbulence model, steady-state flows both in the nozzle and in the rotor blade channels are computed. Effects of blade deformation under the centrifugal force action are analyzed. Results of computations are compared with experimental data for outlet section flow parameters. The better agreement between computational and experimental data has been achieved when the blade deformation under centrifugal force action has been taken into account.

proceedings of ... european conference on turbomachinery fluid dynamics and thermodynamics

Experience in numerical simulation of turbulent wet-steam flow in the last stage of a high-power condensing turbine under conditions defined by full-scale experiments at a power plant