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Development and Validation of an Object-Oriented Code Implementing an Enhanced Radiative Joined MBL-Zonal Method Technique

[+] Author Affiliations
Luca Ratto, Gabriele Ottino

CFD-Engineering S.r.l., Genova, Italy

Massimiliano Maritano

Ansaldo Energia S.p.A., Genova, Italy

Paper No. GT2012-69837, pp. 1073-1082; 10 pages
doi:10.1115/GT2012-69837
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 4: Heat Transfer, Parts A and B
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4470-0
  • Copyright © 2012 by ASME

abstract

Gas turbines are the most widely employed high power prime movers for energy production and propulsion; their success is based on high power density, high reliability and low pollutant emissions. Due to the increasing performance request of modern gas turbines, combustion chambers and, more in general, turbine components are subjected to increasingly high thermal loads, due to both convection and radiation between solid walls and internal fluid. Computational Fluid Dynamics (CFD) tools are typically employed to reproduce these phenomena: commercial codes provide tools for both the heat transfer methods, but the radiation analysis sometimes could represent a great increase in the computational load; for this reason, it is a widespread industrial practice to avoid direct simulation of radiative phenomena during simulations, confining it during the post-processing activity. A typical industrial approach relies on the so-called Zonal Method, which guarantees a good compromise between accuracy of results and computational load. In a previous work, an innovative method for radiative thermal load evaluation has been presented by the authors, which is based on a joined Zonal Method-Mean Beam Length (MBL) approach: it enables a great reduction in time consumption by means of an appropriate Artificial Neural Network, but its usage is limited to hexahedral structured grids, which reduces its application to relatively simple geometries. In this paper, the method previously mentioned has been extended to unstructured tetrahedral grids. The procedure developed has been implemented in an object-oriented code by means of an open-source library: great advantages have been obtained both in the implementation, which results to be simpler, making any future modifications faster and intuitive, and in the application field, being extended to almost any kind of geometry. The code has been validated on literature test cases providing a good agreement between numerical and experimental results. Moreover, an industrial application has been described: it concerns the evaluation of the radiative heat transfer on the shells of an industrial gas turbine combustion chamber. Results are presented and discussed.

Copyright © 2012 by ASME

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