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Conjugate Heat Transfer Methodology for Thermal Design and Verification of Gas Turbine Cooled Components

[+] Author Affiliations
Lorenzo Winchler, Antonio Andreini, Bruno Facchini

University of Florence, Florence, Italy

Luca Andrei, Alessio Bonini, Luca Innocenti

Baker Hughes, a GE Company, Florence, Italy

Paper No. GT2018-75649, pp. V05AT10A001; 11 pages
doi:10.1115/GT2018-75649
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 5A: Heat Transfer
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5108-1
  • Copyright © 2018 by ASME

abstract

Gas turbine design has been characterized over the years by a continuous increase of the maximum cycle temperature, justified by a corresponding increase of cycle efficiency and power output. In such way turbine components heat load management has become a compulsory activity and then, a reliable procedure to evaluate the blades and vanes metal temperatures, is, nowadays, a crucial aspect for a safe components design.

In the framework of the design and validation process of HPT (High Pressure Turbine) cooled components of the BHGE NovaLT™ 16 gas turbine, a decoupled methodology for conjugate heat transfer prediction has been applied and validated against measurement data. The procedure consists of a conjugate heat transfer analysis in which the internal cooling system (for both airfoils and platforms) is modeled by an in-house one-dimensional thermo-fluid network solver, the external heat loads and pressure distribution are evaluated through 3D CFD analysis and the heat conduction in the solid is carried out through a 3D FEM solution. Film cooling effect has been treated by means of a dedicated CFD analysis, implementing a source term approach.

Predicted metal temperatures are finally compared with measurements from an extensive test campaign of the engine, in order to validate the presented procedure.

Copyright © 2018 by ASME

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