A three-dimensional RANS 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 to the original ones.
A Redesign Strategy to Improve the Efficiency of a 17-Stage Steam Turbine / Filippo Rubechini;Andrea Schneider;Andrea Arnone;Stefano Cecchi;Francesco Malavasi. - ELETTRONICO. - 7: Turbomachinery, Parts A and B:(2009), pp. 1463-1470. (Intervento presentato al convegno ASME Turbo Expo 2009: Power for Land, Sea, and Air tenutosi a Orlando, Florida, USA nel June 8–12, 2009) [10.1115/GT2009-60083].
A Redesign Strategy to Improve the Efficiency of a 17-Stage Steam Turbine
RUBECHINI, FILIPPO;SCHNEIDER, ANDREA;ARNONE, ANDREA;
2009
Abstract
A three-dimensional RANS 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 to the original ones.
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