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On proper closures for modeling of turbulent combustion

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Treść / Zawartość
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Języki publikacji
EN
Abstrakty
EN
The subject of this work is the numerical simulation of a turbulent diffusion jet flame fueled with a mixture of CH4, H2, and N2. Simulations have been investigated with various two-equation turbulence models to improve prediction of jet flow fields. The calculations are validated against existing experimental data obtained by Raman and laser Doppler velocimetry. In particular, a comparison of three two-equation turbulence models and their influence on combustion proces is presented, namely the Pope corrected k-ε model, standard k-ε model and the realizable k-ε. For combustion modeling the eddy dissipation concept (EDC) model with a 25-step reaction is considered. The numerical results for mean velocity components, temperature, and major chemical species are presented and compared with the experimental data. The goal of the work is to investigate the capabilities of the used turbulence models in proper predicting of the round jet spreading in a nonpremixed jet flame. Simple geometry allows for reliable flow simulations. Calculations were performed using FLUENT 2D and 3D solver. The Pope correction has been applied via the user defined function. The advantages and disadvantages of the models are discussed in detail in the meantime during presentation of the results.
Rocznik
Tom
Strony
81--91
Opis fizyczny
Bibliogr. 17 poz., rys.
Twórcy
  • The Szewalski Institute of Fluid-Flow Machinery of the Polish Academy of Sciences, Centre for Thermomechanics of Fluids, Energy Conversion Department, Fiszera 14, 80-231 Gdańsk, Poland
Bibliografia
  • [1] Fielder H.E.: Control of free turbulent shear flows. In: Flow Control: Fundamentals and Practices (M.G. El-Hak, A. Pollard, J.P. Bonnet, Eds.), Springer-Verlag, 1998, 335-429.
  • [2] Pope S.B.: An explanation of the turbulent round-jet/plane-jet anomaly. AIAA J. 16(1978), 3, 279-281.
  • [3] McGuirk J.J., Rodi W.: The calculation of three-dimensional turbulent free jets. In: Proc. 1st Symp. on Turbulent Shear Flows, (F. Durst, B.E. Launder, F.W. Schmidt and J.H. Whitelaw, Eds.), 1979, 71-83.
  • [4] Morse A.P.: Axisymmetric turbulent shear flows with and without swirl. PhD thesis, London University, London 1977.
  • [5] Launder B.E., Morse A.P., Rodi W., Spalding D.B.: The prediction of free shear flows a comparison of six turbulence models. NASA SP-311, 1972.
  • [6] Bergmann V., Meier W., Wol_ D., Stricker W.: Application of spontaneous Raman and Rayleigh scattering and 2D LIF characterization of a turbulent CH4/H2/N2 jet diffusion flame. Appl. Phys. B 66(1998), 489-502.
  • [7] Magnussen B.F.: On the structure of turbulence and a generalized eddy dissipation concept for chemical reaction in turbulent flow. Ninetenth AIAA Meeting, St. Louis 1981.
  • [8] Gran I.R., Magnussen B.F.: A numerical study of a bluff-body stabilized diffusion flame. Part 2. Influence of combustion modeling and finite-rate chemistry. Combust. Sci. Technol. 19(1996).
  • [9] Pope S.B.: Computationally efficient implementation of combustion chemistry using in-situ adaptive tabulation. Combust. Theor. Model. 1(1997), 41-63.
  • [10] Smooke M.D., Giovangigli V.: Formulation of the premixed and nonpremixed test problems. In: Reduced Chemical Mechanisms and Asymptotic Approximations for Methane-Air Flames (M. D. Smooke, Ed.), Springer-Verlag, New York 1991, 384, 1-28.
  • [11] Schneider Ch., Dreizler A., Janicka J.: Flow field measurements of stable and locally extinguishing hydrocarbon-fuelled jet _ames. Combust. Flame 135(2003), 185-190.
  • [12] Badur J.: Numerical modeling of sustainable combustion at gas turbine. IFFM PAS, Gdańsk 2003 (in Polish).
  • [13] Karcz M., Badur J.: An alternative two-equation turbulent heat diffusivity closure. Int. J. Heat Mass Transfer 48(2005), 2013-2022.
  • [14] Badur J., Karcz M., Wysocki T.: Chemistry-turbulence coupling in a model of inhomogenously premixed combustion. TASK Q. 7(2003), 337-346.
  • [15] Mameri A., Kaabi A., Gökalp I.: TFC modeling of hydrogenated methane premixed combustion. Revue des Energies Renouvelables CISM'08, Oum El Bouaghi 2008, 227-237.
  • [16] ww.ansys.com
  • [17] Zakrzewski W.: Modeling of turbulent jet diffusion flame. In: Contemporary technologies and energy conversion (W. Przybylski, Ed.), Gdańsk 2010, 349-353 (in Polish).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-ba991653-8029-4e42-b886-3d00132afe01
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