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

[+] Author Affiliations
Juri Bellucci, Filippo Rubechini, Michele Marconcini, Andrea Arnone

University of Florence, Florence, Italy

Lorenzo Arcangeli, Nicola Maceli

GE Oil & Gas, Florence, Italy

Vincenzo Dossena

Politecnico di Milano, Milan, Italy

Paper No. GT2014-25540, pp. V01BT27A015; 12 pages
doi:10.1115/GT2014-25540
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4558-5
  • Copyright © 2014 by ASME

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.

Copyright © 2014 by ASME

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