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Accurate Boundary Conditions for the Numerical Simulation of Thermoacoustic Phenomena in Gas-Turbine Combustion Chambers

[+] Author Affiliations
Axel Widenhorn, Berthold Noll, Manfred Aigner

German Aerospace Center, Stuttgart, Germany

Paper No. GT2006-90441, pp. 347-356; 10 pages
doi:10.1115/GT2006-90441
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 1: Combustion and Fuels, Education
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4236-3 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

The goal of this paper is to discuss the derivation and behaviour of non-reflecting boundary conditions in the framework of accurate calculations of combustion instabilities. Therefore, it is explained for the first time, how to modify the coefficients of the discrete pressure correction equation and of the discrete conservation equations, in order to apply non-reflecting boundary conditions to a pressure based SIMPLE-Algorithm. The theory and practical implementation of the boundary conditions, which are based on Poinsot & Lele’s [1] formulation, will be explained for inflow and outflow boundaries. The method will be validated based upon test cases which are relevant to the simulation of gas turbine combustion chambers. Moreover, the accuracy of non-reflecting boundary conditions is assessed for cases where combustion leads to inhomogeneous temperature and species fields. The impact of the acoustic wave propagation speed on the reflectivity of the non-reflecting boundary conditions is analysed.

Copyright © 2006 by ASME

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