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Numerical Modeling of Soot Production in Aero-Engine Combustors Using Large Eddy Simulations

[+] Author Affiliations
B. Franzelli

CTR-Stanford University, Stanford, CAEM2C (CNRS), Ecole Centrale Paris, Châtenay-Malabry, France

E. Riber, B. Cuenot

CERFACS, Toulouse, France

M. Ihme

CTR-Stanford University, Stanford, CA

Paper No. GT2015-43630, pp. V04BT04A049; 11 pages
doi:10.1115/GT2015-43630
From:
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5669-7
  • Copyright © 2015 by ASME

abstract

Numerical simulations are regarded as an essential tool for improving the design of combustion systems since they can provide information that is complementary to experiments. However, although numerical simulations have already been successfully applied to the prediction of temperature and species concentration in turbulent flames, the production of soot is far from being conclusive due to the complexity of the processes involved in soot production. In this context, first Large Eddy Simulations (LES) of soot production in turbulent flames are reported in the literature in laboratory-scale configurations, thereby confirming the feasibility of the approach. However numerous modeling and numerical issues have not been completely solved. Moreover, validation of the models through comparisons with measurements in realistic complex flows typical of aero-engines is still rare.

This work therefore proposes to evaluate the LES approach for the prediction of soot production in an experimental swirl-stabilized non-premixed ethylene/air aero-engine combustor, for which soot and flame data are available. Two simulations are carried out using a two-equation soot model to compare the performance of a hybrid chemical description (reduced chemistry for the flame structure/tabulated chemistry for soot precursor chemistry) to a classical full tabulation method. Discrepancies of soot concentration between the two LES calculations will be analyzed and the sensitivity to the chemical models will be investigated.

Copyright © 2015 by ASME

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