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

TitleSome Aspects of CFD Modeling in the Analysis of a Low-Pressure Steam Turbine
Publication TypeConference Proceedings
Year of Publication2007
AuthorsRubechini F, Marconcini M, Arnone A, Cecchi S, Daccà F
Conference NameASME Turbo Expo
Volume6: Turbomachinery, Parts A and B
Pagination519–526
PublisherAMER SOC MECHANICAL ENGINEERS, THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
Conference LocationMontreal, Canada, May 14–17
ISBN Number0-7918-4795-0
Accession Number WOS:000249599300048
Other NumbersScopus 2-s2.0-34548743513
KeywordsBody Forces, Real Gas, Shroud Model, Steam Turbine
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.

Notes

ASME paper GT2007-27235

URLhttp://link.aip.org/link/abstract/ASMECP/v2007/i47950/p519/s1
DOI10.1115/GT2007-27235
Refereed DesignationRefereed