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Interaction of Rim Seal and Main Annulus Flow in a Low-Speed Turbine Rig

[+] Author Affiliations
Jesus Pueblas

Universidad Politécnica de Madrid, Madrid, Spain

Roque Corral

Industria de TurboPropulsores S.A., Madrid, Spain

Sebastian Schrewe

Technische Universität Darmstadt, Darmstadt, Germany

Paper No. GT2013-94109, pp. V06AT36A003; 12 pages
doi:10.1115/GT2013-94109
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 influence of the sealing flows on the secondary flows of a low-pressure turbine has been assessed numerically using multi-row steady and unsteady simulations. The experimental data obtained at the Large Scale Turbine Rig (LSTR) at Technische Universität Darmstadt have been used to validate the numerical method and complement the simulations.

Steady and unsteady state solutions and experiments are compared to understand the importance of the unsteadiness in the accuracy of numerical simulations. It is concluded that unsteady rotor/stator simulations enhance the prediction of the stator secondary flows, especially in the tip region.

The effect of the sealing air is analysed, varying the cooling mass flow for two operating conditions. The penetration of the sealing flow in the main stream increases withthe cooling flow, displacing the horseshoe and passage vortices towards the mid-span.

Copyright © 2013 by ASME

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