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Aerodynamic Interactions Between a High Pressure Turbine and the First Low Pressure Stator

[+] Author Affiliations
Pierre Gougeon

Safran Group - Snecma, Moissy-Cramayel, France

Ghislaine Ngo Boum, Francis Lebœuf

École Centrale de Lyon, Ecully, France

Paper No. GT2013-95725, pp. V06AT36A037; 14 pages
doi:10.1115/GT2013-95725
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

This paper presents a numerical study on the interaction between a single-stage high-pressure turbine and the first vane row of a low-pressure turbine at aerodesign conditions. It focuses on the simulation of the flow within the inter-turbine duct and the loss generated in the downstream low-pressure vane.

Former experiments provided steady and unsteady measurements in the duct between the high and the low-pressure turbines and after the low-pressure nozzle. A 3D unsteady RANS approach with phase-lagged boundary conditions is used to characterize the unsteady periodic effects developing in the inter-turbine channel and downstream in the low-pressure vane.

For the numerical study, two different configurations were considered: a single stage high-pressure turbine configuration and a high-pressure rotor coupled with a low-pressure vane. For the second one, two inlet boundary conditions are considered upstream of the rotor: a circumferentially uniform boundary condition and a circumferentially non uniform rotating boundary condition. The resulting flow fields are compared within the intermediate duct.

A harmonic Fourier analysis is carried out to underline the effects of upstream and downstream stator and the interaction with the high-pressure rotor. An unsteady Adamczyk decomposition within a plane located in the duct showed the influence of the different components and the levels of unsteadiness. Comparisons with experimental data show a reasonable good agreement.

Copyright © 2013 by ASME

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