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On the Periodically Unsteady Interaction of Wakes, Secondary Flow Development and Boundary Layer Flow in an Annular LPT Cascade: Part 2 — Numerical Investigation

[+] Author Affiliations
Benjamin Winhart, Martin Sinkwitz, David Engelmann, Francesca di Mare

Ruhr-Universität Bochum, Bochum, Germany

Ronald Mailach

Technische Universität Dresden, Dresden, Germany

Paper No. GT2018-76873, pp. V02AT45A033; 11 pages
doi:10.1115/GT2018-76873
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 2A: Turbomachinery
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5099-2
  • Copyright © 2018 by ASME

abstract

In this work we present the results of the numerical investigations concerning interaction effects between periodically incoming wakes, secondary flow development and boundary layer flow inside a low pressure turbine (LPT) equipped with modified T106-profile blades. The numerical predictions obtained using 3D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations are compared against stationary and time resolved experimental results conducted in the same configuration and discussed in part 1 of this 2-part work. For the investigation of the spatial topologies and the dynamics of the coherent flow structures under periodical wake impact, a frequency domain analysis as well as proper orthogonal decomposition (POD) of the unsteady data is proposed and discussed.

Copyright © 2018 by ASME

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