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Numerical Simulation of a Gas Turbine Model Combustor Operated Near the Lean Extinction Limit

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

German Aerospace Centre (DLR), Stuttgart, Germany

Paper No. GT2010-22751, pp. 603-612; 10 pages
doi:10.1115/GT2010-22751
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4397-0 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

This work focuses on the numerical simulation of a gas turbine model combustor operated near the lean extinction limit using a hybrid LES-RANS model. A broad experimental database for the testcase is available from previous works, allowing an accurate evaluation of the performance of the chosen combination of turbulence and combustion models. Both time-averaged variables and typical instantaneous distributions are presented. The averaged parameters enable a first characterization of the flame and show the typical structures for swirled flames. Additionally, the unsteady characteristic quantities reveal vortex shedding and a helical vortex structure, which are crucial for mixing of recirculated hot products. Comparison of radial profiles from the computed and experimental data exhibits very good agreement, even for the relative simple chemical kinetic reaction scheme adopted.

Copyright © 2010 by ASME

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