Abstract
Large eddy simulations (LES) were performed to study the non-reacting flow fields of a Cambridge swirl burner. The dynamic Smagorinsky eddy viscosity model is used as the sub-grid scale turbulence model. Comparisons of experimental data show that the LES results are capable of predicting mean and root-mean-square velocity profiles. The LES results show that the annular swirling flow has a minor impact on the formation of the bluff-body recirculation zone. The vortex structures near the shear layers, visualized by the iso-surface of Q-criterion, display ring structures in non-swirling flow and helical structures in swirling flow near the burner exit. Spectral analysis was employed to predict the occurrence of flow oscillations induced by vortex shedding and precessing vortex core (PVC). In order to extract accurately the unsteady large-scale structures in swirling flow, a three-dimensional proper orthogonal decomposition (POD) method was developed to reconstruct turbulent fluctuating velocity fields. POD analysis reveals that flow fields contain co-existing helical and toroidal shaped coherent structures. The helical structure associated with the PVC is the most energetic dynamic flow structure. The latter toroidal structure associated with vortex shedding has lower energy content which indicates that it is a secondary structure.
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Ge B, Zang S S. Experimental study on the interactions for bluffbody and swirl in stabilized flame process. J Therm Sci, 2012; 21: 88–96
Alkidas A C. Combustion advancements in gasoline engines. Energ Convers Manage, 2007; 48: 2751–2761
Mansour A. Gas turbine fuel injection technology. In: ASME Turbo Expo 2005: Power for Land, Sea, and Air, Reno, Nevada, USA, 2005
Lucca-Negro O, O'doherty T. Vortex breakdown: A review. Prog Energ Combust, 2001; 27: 431–481
Esquiva-Dano I, Nguyen H, Escudie D. Influence of a bluff-body’s shape on the stabilization regime of non-premixed flames. Combust Flame, 2001; 127: 2167–2180
Escudier M. Vortex breakdown: Observations and explanations. Prog Aerosp Sci, 1988; 25: 189–229
Ayache S V. Simulations of turbulent swirl combustors. Dissertation for the Doctoral Degree. Cambridge: University of Cambridge, 2012
Leibovich S. Vortex stability and breakdown-survey and extension. AIAA J, 1984; 22: 1192–1206
Gallaire F, Chomaz J. Mode selection in swirling jet experiments: A linear stability analysis. J Fluid Mech, 2003; 494: 223–253
Vonnegut B. A vortex whistle. J Acoust Soc Am, 1954; 26: 18–20
Syred N, Beer J. Damping of precessing vortex cores by combustion in swirl generators. Astronautica Acta, 1972, 17: 783
Al-Abdeli Y M, Masri A R. Precession and recirculation in turbulent swirling isothermal jets. Combust Sci Tech, 2004; 176: 645–665
Syred N, Wong C, Rodriquez-Martinez V, et al. Characterisation of the occurrence of the precessing vortex core in partially premixed and non-premixed swirling flow. In: Proceedings of the 12th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 2004
Krüger O, Duwig C, Goeckeler K, et al. Identification of coherent structures in a turbulent generic swirl burner using large eddy simulations. In: 20th AIAA Computational Fluid Dynamics Conference, Hawaii, USA, 2011
Krüger O, Terhaar S, Paschereit C O, et al. Numerical investigations and modal analysis of the coherent structures in a generic swirl burner. In: 21st AIAA Computational Fluid Dynamics Conference, San Diego, USA, 2013
García-Villalba M, Fröhlich J, Rodi W. Identification and analysis of coherent structures in the near field of a turbulent unconfined annular swirling jet using large eddy simulation. Phys Fluids, 2006, 18: 055103
Cala C, Fernandes E, Heitor M, et al. Coherent structures in unsteady swirling jet flow. Exp Fluids, 2006; 40: 267–276
Syred N. A review of oscillation mechanisms and the role of the precessing vortex core (PVC) in swirl combustion systems. Prog Energ Combust, 2006; 32: 93–161
Ren Z, Lu Z, Hou L, et al. Numerical simulation of turbulent combustion: scientific challenges. Sci China-Phys Mech Astron, 2014; 57: 1495–1503
Wang Y, Chen F, Liu H, et al. Large eddy simulation of unsteady transitional flow on the low-pressure turbine blade. Sci China Tech Sci, 2014; 57: 1761–1768
Qin W, Xie M, Jia M, et al. Large eddy simulation and proper orthogonal decomposition analysis of turbulent flows in a direct injection spark ignition engine: cyclic variation and effect of valve lift. Sci China Tech Sci, 2014; 57: 489–504
Li Z, Huai W, Qian Z. Large eddy simulation of a round jet into a counterflow. Sci China Tech Sci, 2013; 56: 484–491
Wang Z, Xu Y, Lü Y, et al. LES investigation of swirl intensity effect on unconfined turbulent swirling premixed flame. Chin Sci Bull, 2014; 59: 4550–4558
Wang B, Wang Z, Cui G, et al. Study on the dynamic characteristics of flow over building cluster at high Reynolds number by large eddy simulation. Sci China-Phys Mech Astron, 2014; 57: 1144–1159
Ranga Dinesh K, Kirkpatrick M. Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES. Comput Fluids, 2009; 38: 1232–1242
Roux S, Lartigue G, Poinsot T, et al. Studies of mean and unsteady flow in a swirled combustor using experiments, acoustic analysis, and large eddy simulations. Combust Flame, 2005; 141: 40–54
Wang P, Bai X S, Wessman M, et al. Large eddy simulation and experimental studies of a confined turbulent swirling flow. Phys Fluids, 2004; 16: 3306–3324
Wang S, Yang V, Hsiao G, et al. Large-eddy simulations of gas-turbine swirl injector flow dynamics. J Fluid Mech, 2007; 583: 99–122
Wegner B, Maltsev A, Schneider C, et al. Assessment of unsteady RANS in predicting swirl flow instability based on LES and experiments. Int J Heat Fluid Fl, 2004; 25: 528–536
Jeong J, Hussain F. On the identification of a vortex. J Fluid Mech, 1995; 285: 69–94
Berkooz G, Holmes P, Lumley J L. The proper orthogonal decomposition in the analysis of turbulent flows. Annu Rev Fluid Mech, 1993; 25: 539–575
Yang Y, Kær S K. Large-eddy simulations of the non-reactive flow in the Sydney swirl burner. Int J Heat Fluid Fl, 2012; 36: 47–57
Oberleithner K, Sieber M, Nayeri C, et al. Three-dimensional coherent structures in a swirling jet undergoing vortex breakdown: Stability analysis and empirical mode construction. J Fluid Mech, 2011; 679: 383–414
Kamal M M, Duwig C, Balusamy S, et al. Proper orthogonal decomposition analysis of non-swirling turbulent stratified and premixed methane/air flames. In: ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, Düsseldorf, Germany, 2014
Sweeney M S, Hochgreb S, Dunn M J, et al. The structure of turbulent stratified and premixed methane/air flames I: Non-swirling flows. Combust Flame, 2012; 159: 2896–2911
Sweeney M S, Hochgreb S, Dunn M J, et al. The structure of turbulent stratified and premixed methane/air flames II: Swirling flows. Combust Flame, 2012; 159: 2912–2929
Zhou R, Balusamy S, Sweeney M S, et al. Flow field measurements of a series of turbulent premixed and stratified methane/air flames. Combust Flame, 2013; 160: 2017–2028
Germano M, Piomelli U, Moin P, et al. A dynamic subgrid-scale eddy viscosity model. Phys Fluids A: Fluid Dyn, 1991; 3: 1760–1765
Pope S B. Turbulent Flows. Cambridge: Cambridge University Press, 2000
Ranga Dinesh K, Jenkins K, Savill A, et al. Swirl effects on external intermittency in turbulent jets. Int J Heat Fluid Fl, 2012; 33: 193–206
Issa R I. Solution of the implicitly discretised fluid flow equations by operator-splitting. J Comput Phys, 1986; 62: 40–65
Han C, Zhang P, Ye T, et al. Numerical study of methane/air jet flame in vitiated co-flow using tabulated detailed chemistry. Sci China Tech Sci, 2014; 57: 1750–1760
Sirovich L. Turbulence and the dynamics of coherent structures. I-Coherent structures. II-Symmetries and transformations. III-Dynamics and scaling. Q Appl Math, 1987; 45: 561–571
Sweeney M. Measurements of the structure of turbulent premixed and stratified methane/air flames. Dissertation for the Doctor Degree. Cambridge: University of Cambridge, 2011
Syred N, Beer J. Combustion in swirling flows: A review. Combust Flame, 1974; 23: 143–201
Syred N, O' doherty T, Froud D. The interaction of the precessing vortex core and reverse flow zone in the exhaust of a swirl burner. P I Mech Eng A-J Pow, 1994; 208: 27–36
Froud D, O'doherty T, Syred N. Phase averaging of the precessing vortex core in a swirl burner under piloted and premixed combustion conditions. Combust Flame, 1995; 100: 407–412
Syred N, Fick W, O' doherty T, et al. The effect of the precessing vortex core on combustion in a swirl burner. Combust Sci Technol, 1997; 125: 139–157
Schlüter J U. Large eddy simulations of flow and mixing in jets and swirl flows: Application to a gas turbine. Dissertation for the Doctor Degree. Toulouse: Institut national polytechnique de Toulouse, 2000
Schlichting H, Gersten K. Grenzschicht-Theorie. Berlin: Springer, 2006
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Zhang, H., Han, C., Ye, T. et al. Large eddy simulation of unconfined turbulent swirling flow. Sci. China Technol. Sci. 58, 1731–1744 (2015). https://doi.org/10.1007/s11431-015-5912-2
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DOI: https://doi.org/10.1007/s11431-015-5912-2