The present study aims to investigate the interaction between a last-stage steam turbine blade row and diffuser. This work is carried out using computational fluid dynamics (CFD) simulations of a generic last-stage low-pressure (LP) turbine and axial–radial exhaust diffuser attached to it. In order to determine the validity of the computational method, the CFD predictions are first compared with data obtained from an experimental test facility. A computational study is then performed for different design configurations of the diffuser and rotor casing shapes. The study focuses on typical flow features such as effects of rotor tip leakage flows and subsequent changes in the rotor–diffuser interactions. The results suggest that the rotor casing shape influences the rotor work extraction capability and yields significant improvements in the diffuser static pressure recovery.
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February 2017
Research-Article
The Effect of Rotor Casing on Low-Pressure Steam Turbine and Diffuser Interactions
Andrew P. S. Wheeler,
Andrew P. S. Wheeler
Department of Engineering,
University of Cambridge,
Cambridge CB30DY, UK
University of Cambridge,
Cambridge CB30DY, UK
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Gurnam Singh
Gurnam Singh
GE Power,
Rugby CV212NH, UK
Rugby CV212NH, UK
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Gursharanjit Singh
Andrew P. S. Wheeler
Department of Engineering,
University of Cambridge,
Cambridge CB30DY, UK
University of Cambridge,
Cambridge CB30DY, UK
Gurnam Singh
GE Power,
Rugby CV212NH, UK
Rugby CV212NH, UK
Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 9, 2016; final manuscript received July 11, 2016; published online September 20, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Feb 2017, 139(2): 022607 (12 pages)
Published Online: September 20, 2016
Article history
Received:
May 9, 2016
Revised:
July 11, 2016
Citation
Singh, G., Wheeler, A. P. S., and Singh, G. (September 20, 2016). "The Effect of Rotor Casing on Low-Pressure Steam Turbine and Diffuser Interactions." ASME. J. Eng. Gas Turbines Power. February 2017; 139(2): 022607. https://doi.org/10.1115/1.4034417
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