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Challenging modeling strategies for LES of non-adiabatic turbulent stratified combustion

Fiorina, B., (författare)
CNRS, Laboratoire EM2C, CentraleSupelec, France
Mercier, R., (författare)
CNRS, Laboratoire EM2C, CentraleSupelec, France
Kuenne, G., (författare)
TU Darmstadt, Institute of Energy and Power Plant Technology, Germany. TU Darmstadt, Darmstadt Graduate School of Energy Science and Engineering, Germany
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Ketelheun, A., (författare)
TU Darmstadt, Institute of Energy and Power Plant Technology, Germany. TU Darmstadt, Darmstadt Graduate School of Energy Science and Engineering, Germany
Avdić, A., (författare)
TU Darmstadt, Institute of Energy and Power Plant Technology, Germany. TU Darmstadt, Graduate School of Computational Engineering, Germany
Janicka, J., (författare)
TU Darmstadt, Institute of Energy and Power Plant Technology, Germany. TU Darmstadt, Darmstadt Graduate School of Energy Science and Engineering, Germany
Geyer, D., (författare)
Darmstadt University of Applied Sciences, Thermodynamik, Germany
Dreizler, A., (författare)
TU Darmstadt, Institute of Energy and Power Plant Technology, Germany. TU Darmstadt, Darmstadt Graduate School of Energy Science and Engineering, Germany
Alenius, Emma, (författare)
Lund University, Sweden
Duwig, Christophe, (författare)
KTH, Mekanik, Lund University, Sweden
Trisjono, P., (författare)
RWTH Aachen University, Institute for Combustion Technology, Germany
Kleinheinz, K., (författare)
RWTH Aachen University, Institute for Combustion Technology, Germany
Kang, S., (författare)
Sogang University, Department of Mechanical Engineering, Republic of Korea
Pitsch, H., (författare)
RWTH Aachen University, Institute for Combustion Technology, Germany
Proch, F., (författare)
University of Duisburg-Essen, Institute for Combustion and Gasdynamics (IVG), Chair for Fluid Dynamics, Germany
Cavallo Marincola, F., (författare)
University of Duisburg-Essen, Institute for Combustion and Gasdynamics (IVG), Chair for Fluid Dynamics, Germany
Kempf, A., (författare)
University of Duisburg-Essen, Institute for Combustion and Gasdynamics (IVG), Chair for Fluid Dynamics, Germany
Avdic, A. (författare)
Marincola, F. Cavallo (författare)
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KTH Skolan för teknikvetenskap (SCI). Mekanik. (creator_code:org_t)
Lunds universitet Strömningsteknik. (creator_code:org_t)
2015
Engelska.
Ingår i: Combustion and Flame. - Elsevier. - 0010-2180. ; 162:11, s. 4264-4282
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Five different low-Mach large eddy simulations are compared to the turbulent stratified flame experiments conducted at the Technical University of Darmstadt (TUD). The simulations were contributed by TUD, the Institute for Combustion Technology (ITV) at Aachen, Lund University (LUND), the EM2C laboratory at Ecole Centrale Paris, and the University of Duisburg-Essen (UDE). Combustion is modeled by a premixed flamelet tabulation with local flame thickening (TUD), a premixed flamelet progress variable approach coupled to a level set method (ITV), a 4-steps mechanism combined with implicit LES (LUND), the F-TACLES model that is based on filtered premixed flamelet tabulation (EM2C), and a flame surface density approach (UDE). An extensive comparison of simulation and experimental data is presented for the first two moments of velocity, temperature, mixture fraction, and major species mass fractions. The importance of heat-losses was assessed by comparing simulations for adiabatic and isothermal boundary conditions at the burner walls. The adiabatic computations predict a flame anchored on the burner lip, while the non-adiabatic simulations show a flame lift-off of one half pilot diameter and a better agreement with experimental evidence for temperature and species concentrations. Most simulations agree on the mean flame brush position, but it is evident that subgrid turbulence must be considered to achieve the correct turbulent flame speed. Qualitative comparisons of instantaneous snapshots of the flame show differences in the size of the resolved flame wrinkling patterns. These differences are (a) caused by the influence of the LES combustion model on the flame dynamics and (b) by the different simulation strategies in terms of grid, inlet condition and numerics. The simulations were conducted with approaches optimized for different objectives, for example low computational cost, or in another case, short turn around. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

Model comparison
Non-adiabatic
Heat losses
chemistry
Tabulated
Turbulent stratified combustion
Large Eddy Simulation

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