Numerical Investigation of Three-Dimensional Clocking Effects in a Low Pressure Turbine

TitleNumerical Investigation of Three-Dimensional Clocking Effects in a Low Pressure Turbine
Publication TypeJournal Article
Year of Publication2004
AuthorsArnone A, Marconcini M, Scotti Del Greco A, Spano E
JournalASME Journal of Turbomachinery
Volume126
Issue3
Pagination375–384
Date Published07/2004
ISSN Number0889-504X
Accession NumberWOS:000224083900005
Other NumbersScopus 2-s2.0-5544244554
KeywordsClocking, performance, Unsteady Flows, Wakes
Abstract

One and a half stages of a low pressure turbine were investigated using a three-dimensional time-accurate viscous solver. Unsteady analyses were carried out by varying the circumferential relative position of consecutive vanes to study the effects of clocking on performance. Assuming that efficiency improvements by clocking are linked to the wake tangential position with respect to the successive blade, a certain circumferential shift in this position can be observed along the blade height due to blade twist and non-radial stacking, giving different contributions. In order to assess this phenomenon, results from three-dimensional computations were compared with a quasi-three-dimensional analysis at mid-span. The effects of clocking on wake interaction mechanisms and unsteady blade loadings are presented and discussed.

URLhttp://turbomachinery.asmedigitalcollection.asme.org/article.aspx?articleid=1466843
DOI10.1115/1.1740780
Refereed DesignationRefereed