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 / F. Rubechini; A. Schneider; A. Arnone; S. Cecchi; F. Malavasi. - In: JOURNAL OF TURBOMACHINERY. - ISSN 0889-504X. - ELETTRONICO. - 134:(2011), pp. 031021-1-031021-7. [10.1115/1.4003082]

A Redesign Strategy to Improve the Efficiency of a 17-Stage Steam Turbine

RUBECHINI, FILIPPO;SCHNEIDER, ANDREA;ARNONE, ANDREA;
2011

Abstract

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.
134
031021-1
031021-7
F. Rubechini; A. Schneider; A. Arnone; S. Cecchi; F. Malavasi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/356658
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