Incoming standards on NOx emissions are motivating many aero-engines manufacturers to adopt the lean burn combustion concept. However, several technological issues have to be faced in this transition, among which limited availability of air for cooling purpose and thermoacoustics phenomena. In this scenario, standard numerical design tools are not often capable of characterizing such devices. Thus, considering also the difficulties of experimental investigations in a highly pressurized and reactive environment, unsteady scale-resolved CFD methods are required to correctly understand the combustor performances. In this work, a set of scale-resolved simulations have been carried out on the Deutsches Zentrum für Luft- und Raumfahrt (DLR) generic single-sector combustor spray flame for which measurements both in nonreactive and reactive test conditions are available. Exploiting a two-phase Eulerian–Lagrangian approach combined with a flamelet generated manifold (FGM) combustion model, LES simulations have been performed in order to assess the potential improvements with respect to steady-state solutions. Additional comparisons have also been accomplished with scale-adaptive simulation (SAS) calculations based on eddy dissipation combustion model (EDM). The comparison with experimental results shows that the chosen unsteady strategies lead to a more physical description of reactive processes with respect to Reynolds-averaged Navier–Stokes (RANS) simulations. FGM model showed some limitations in reproducing the partially premixed nature of the flame, whereas SAS–EDM proved to be a robust modeling strategy within an industrial perspective. A new set of spray boundary conditions for liquid injection is also proposed whose reliability is proved through a detailed comparison against experimental data.
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February 2017
Research-Article
Assessment of Scale-Resolved Computational Fluid Dynamics Methods for the Investigation of Lean Burn Spray Flames
Stefano Puggelli,
Stefano Puggelli
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: stefano.puggelli@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: stefano.puggelli@htc.de.unifi.it
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Davide Bertini,
Davide Bertini
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: davide.bertini@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: davide.bertini@htc.de.unifi.it
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Lorenzo Mazzei,
Lorenzo Mazzei
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: lorenzo.mazzei@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: lorenzo.mazzei@htc.de.unifi.it
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Antonio Andreini
Antonio Andreini
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: antonio.andreini@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: antonio.andreini@htc.de.unifi.it
Search for other works by this author on:
Stefano Puggelli
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: stefano.puggelli@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: stefano.puggelli@htc.de.unifi.it
Davide Bertini
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: davide.bertini@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: davide.bertini@htc.de.unifi.it
Lorenzo Mazzei
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: lorenzo.mazzei@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: lorenzo.mazzei@htc.de.unifi.it
Antonio Andreini
Department of Industrial Engineering,
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: antonio.andreini@htc.de.unifi.it
University of Florence,
via Santa Marta 3,
Florence 50139, Italy
e-mail: antonio.andreini@htc.de.unifi.it
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 20, 2016; final manuscript received June 22, 2016; published online September 13, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Feb 2017, 139(2): 021501 (11 pages)
Published Online: September 13, 2016
Article history
Received:
June 20, 2016
Revised:
June 22, 2016
Citation
Puggelli, S., Bertini, D., Mazzei, L., and Andreini, A. (September 13, 2016). "Assessment of Scale-Resolved Computational Fluid Dynamics Methods for the Investigation of Lean Burn Spray Flames." ASME. J. Eng. Gas Turbines Power. February 2017; 139(2): 021501. https://doi.org/10.1115/1.4034194
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