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The Application of Ultra High Lift Blading in the BR715 LP Turbine

[+] Author Affiliations
Frank Haselbach, Heinz-Peter Schiffer, Mannfred Horsman, Stefan Dressen

Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz, Germany

Neil Harvey, Simon Read

Rolls-Royce plc, Derby, UK

Paper No. 2001-GT-0436, pp. V001T03A058; 9 pages
doi:10.1115/2001-GT-0436
From:
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7850-7
  • Copyright © 2001 by ASME

abstract

The original LP turbine of the BR715 engine featured “High Lift” blading, which achieved a 20% reduction in aerofoil numbers compared to blading with conventional levels of lift - reported in Cobley et al. (1997). This paper describes the design and test of a re-bladed LP turbine with new “Ultra High Lift” aerofoils, achieving a further reduction of approximately 11% in aerofoil count and significant reductions in turbine weight. The design is based on the successful cascade experiments of Howell et al. (2000) and Brunner et al. (2000). Unsteady wake - boundary layer interaction on these low Reynolds number aerofoils is of particular importance in their successful application. Test results show the LP turbine performance to be in line with expectation. Measured aerofoil pressure distributions are presented and compared with the design intent. Changes in the turbine characteristics relative to the original design are interpreted by making reference to the detailed differences in the two aerofoil design styles.

Copyright © 2001 by ASME
Topics: Turbines

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