Numerical Investigation of Three-Dimensional Clocking Effects in a Low Pressure Turbine
Author:
Arnone Andrea1, Marconcini Michele1, Del Greco Alberto Scotti1, Spano Ennio2
Affiliation:
1. “Sergio Stecco” Department of Energy Engineering, University of Florence, Via di Santa Marta, 3, 50139 Firenze, Italy 2. Fiat Avio S.p.A.–Direzione Tecnica, Via Nizza, 312, 10127 Torino, Italy
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 nonradial 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.
Publisher
ASME International
Subject
Mechanical Engineering
Reference40 articles.
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