A three-dimensional, multistage, Navier-Stokes solver is applied to the numerical investigation of a four stage low-pressure steam turbine. The thermodynamic behavior of the wet steam is reproduced by adopting a real-gas model, based on the use of gas property tables. Geometrical features and flow-path details consistent with the actual turbine geometry, such as cavity purge flows, shroud leakage flows and partspan snubbers, are accounted for, and their impact on the turbine performance is discussed. These details are included in the analysis using simple models, which prevent a considerable growth of the computational cost and make the overall procedure attractive as a design tool for industrial purposes. Shroud leakage flows are modeled by means of suitable endwall boundary conditions, based on coupled sources and sinks, while body forces are applied to simulate the presence of the damping wires on the blades. In this work a detailed description of these models is provided, and the results of computations are compared with experimental measurements.

Some Aspects of CFD Modeling in the Analysis of a Low-Pressure Steam Turbine / F. Rubechini; M. Marconcini; A. Arnone; S. Cecchi; F. Daccà. - ELETTRONICO. - 6: Turbomachinery, Parts A and B, Axial Flow Turbine Aerodynamics and Heat Transfer:(2007), pp. 519-526. ((Intervento presentato al convegno ASME Turbo Expo 2007: Power for Land, Sea, and Air tenutosi a Montreal, Canada nel 14-17 May [10.1115/GT2007-27235].

Some Aspects of CFD Modeling in the Analysis of a Low-Pressure Steam Turbine

RUBECHINI, FILIPPO;MARCONCINI, MICHELE;ARNONE, ANDREA;
2007

Abstract

A three-dimensional, multistage, Navier-Stokes solver is applied to the numerical investigation of a four stage low-pressure steam turbine. The thermodynamic behavior of the wet steam is reproduced by adopting a real-gas model, based on the use of gas property tables. Geometrical features and flow-path details consistent with the actual turbine geometry, such as cavity purge flows, shroud leakage flows and partspan snubbers, are accounted for, and their impact on the turbine performance is discussed. These details are included in the analysis using simple models, which prevent a considerable growth of the computational cost and make the overall procedure attractive as a design tool for industrial purposes. Shroud leakage flows are modeled by means of suitable endwall boundary conditions, based on coupled sources and sinks, while body forces are applied to simulate the presence of the damping wires on the blades. In this work a detailed description of these models is provided, and the results of computations are compared with experimental measurements.
Conference Proceedings
ASME Turbo Expo 2007: Power for Land, Sea, and Air
Montreal, Canada
14-17 May
F. Rubechini; M. Marconcini; A. Arnone; S. Cecchi; F. Daccà
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/355144
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