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Controlling the Secondary Flow in a Turbine Cascade by 3D Airfoil Design and Endwall Contouring FREE

[+] Author Affiliations
Arno Duden, Leonhard Fottner

Universität der Bundeswehr München, Neubiberg, Germany

Irene Raab

MTU München GmbH, München, Germany

Paper No. 98-GT-072, pp. V001T01A023; 10 pages
doi:10.1115/98-GT-072
From:
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 1: Turbomachinery
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7862-0
  • Copyright © 1998 by ASME

abstract

A highly loaded turbine cascade has been redesigned with the objective to reduce the secondary flow by applying endwall contouring and 3D airfoil design in the endwall regions. The overall loading and the axial area ratio of the cascade have been kept constant. With the tools of a 3D design environment a systematic study has been carried out regarding several features of the endwall pressure distribution and their influence on the secondary flow. Two optimized configurations have been investigated in a high speed cascade wind tunnel. The flow field traverses showed improvements concerning the radial extent of the secondary flow and a decrease in secondary loss of 26 per cent. Unfortunately this reduction was counterbalanced by increased profile losses and higher inlet losses due to increased blockage. The striking feature of the cascade with endwall contouring and 3D airfoil design was a significant reduction of the exit flow angle deviations connected with the secondary flow. The predictions obtained by the 3D Navier-Stokes solver TRACE_S showed a remarkable agreement with the experimental results.

Copyright © 1998 by ASME
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