The Influence of Roughness on a High-Pressure Steam Turbine Stage: an Experimental and Numerical Study

TitleThe Influence of Roughness on a High-Pressure Steam Turbine Stage: an Experimental and Numerical Study
Publication TypeJournal Article
Year of Publication2015
AuthorsBellucci J, Rubechini F, Marconcini M, Arnone A, Arcangeli L, Maceli N, Dossena V
JournalASME Journal of Engineering for Gas Turbines and Power
Volume137
Issue1
Number012602
Pagination1-9
Date Published08/2014
ISSN Number0742-4795
Accession NumberWOS:000348050300013
Other NumbersScopus 2-s2.0-84906835814
KeywordsRoughness, Steam Turbine, Surface Finishing, Transition
Abstract

This work deals with the influence of roughness on high-pressure steam turbine stages. It is divided in three parts. In the first one, an experimental campaign on a linear cascade is described, in which blade losses are measured for different values of surface roughness and in a range of Reynolds numbers of practical interest. The second part is devoted to the basic aspects of the numerical approach, and consists of a detailed discussion of the roughness models used for computations. The fidelity of such models is then tested against measurements, thus allowing their fine-tuning and proving their reliability. Finally, comprehensive CFD analysis is carried out on a high-pressure stage, in order to investigate the influence of roughness on the losses over the entire stage operating envelope. Unsteady effects that may affect the influence of the roughness, such as the upcoming wakes on the rotor blade, are taken into account, and the impact of transition-related aspects on the losses is discussed.

URLhttp://gasturbinespower.asmedigitalcollection.asme.org/article.aspx?articleid=1896624
DOI10.1115/1.4028205
Refereed DesignationRefereed