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Unsteady Secondary Flow in a Low Pressure Turbine With Integrated 3D Design

[+] Author Affiliations
D. Schrack, C. M. Schneider, M. Fraas, M. G. Rose, S. Staudacher

University of Stuttgart, Stuttgart, Germany

K. Engel

MTU Aero Engines GmbH, Munich, Germany

Paper No. GT2013-95700, pp. V06AT36A036; 12 pages
doi:10.1115/GT2013-95700
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 6A: Turbomachinery
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5522-5
  • Copyright © 2013 by ASME

abstract

The LP turbine research rig “ATRD” allows the study of detailed aerodynamics at low Reynolds numbers. The two-stage LP turbines are designed by MTU Aero Engines GmbH and tested in cooperation with the Institute of Aircraft Propulsion Systems (ILA) at Stuttgart University. This paper focuses on the development of the unsteady secondary flow field in two turbine geometries. The flow structures and vortex behaviour of a turbine with integrated 3D design (I3D) is compared to those of a datum case with axisymmetric endwalls. The unsteady flow and its effect on the time mean flow is analysed with five hole probe area traverse data and multistage URANS CFD calculations. The improvement through design optimisation is assessed by analysing secondary flow features as well as loss generation in the first rotor and the second vane. The RANS and URANS predicted improvements in turbine efficiency agree well with the measurement within wide uncertainty bounds. The structure of the secondary flow field is substantially unaltered by the I3D design, but loss coefficients show row loss reductions. The secondary flow structure of the first rotor is dominated by the first NGV which was not redesigned. Therefore an opportunity exists for further performance improvement with its redesign.

Copyright © 2013 by ASME

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