A three-dimensional Reynolds averaged Navier–Stokes solver was applied to the aerodynamic redesigning of a 17-stage steam turbine. The redesign procedure was divided into three steps. In the first one, a single embedded stage was considered, and an optimization of stator lean and rotor twist was carried out by applying suitable repeating inlet/outlet boundary conditions. In the second step, a proper geometrical transformation between the original reference stage and the optimized one was identified and then applied to all other turbine stages, thus leading to a first approximation of the redesigned turbine. Finally, a neural-network-based refinement of the stator and rotor twist of each stage was performed to account for its actual position and operating conditions within the meridional channel. In this work, a detailed description of the redesign procedure is provided, and the aerodynamic characteristics of the optimized geometry are discussed and compared with the original ones.
A Redesign Strategy to Improve the Efficiency of a 17-Stage Steam Turbine
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Rubechini, F., Schneider, A., Arnone, A., Cecchi, S., and Malavasi, F. (July 15, 2011). "A Redesign Strategy to Improve the Efficiency of a 17-Stage Steam Turbine." ASME. J. Turbomach. May 2012; 134(3): 031021. https://doi.org/10.1115/1.4003082
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