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Whole Turbine CFD Modelling

[+] Author Affiliations
N. J. Hills

University of Surrey, Guildford, Surrey, UK

Paper No. GT2007-27918, pp. 817-824; 8 pages
doi:10.1115/GT2007-27918
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 6: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4795-0 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

The level of efficiency of modern turbines means that traditional blade design methods, based on steady state CFD in an idealised annulus, are no longer able to yield the efficiency improvements needed to develop a competitive turbine. Future design improvements will come from understanding and control of the parasitic effects of real geometry, such as cavities, gaps and leakages; and the unsteady interactions between neighbouring components. This paper describes ongoing work to carry out a simulation of a full turbine including both the main annulus and the secondary air system geometry to investigate these effects. A multistage steady-state mixing plane model of an idealised whole turbine was run to provide a baseline solution. Interaction effects between the components were considered by running unsteady models. Firstly the HP stage was modelled as unsteady, with the IP and LP stages continuing to be included as a steady state mixing plane model, but still using the idealised annulus geometry. The idealised geometry for the HP stage was then replaced by the real engine geometry, including the under platform cavity, with similar unsteady calculations being carried out. The feasibility of carrying out these large scale unsteady calculations of a whole turbine with real engine geometry has been demonstrated.

Copyright © 2007 by ASME
Topics: Modeling , Turbines

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