Numerical Analysis and Sensitivity Study of Non-Premixed Combustion Using LES
Non-premixed turbulent combustion Computational Fluid Dynamics (CFD) has been carried out in a simplified methanefuelled coaxial jet combustor employing Large Eddy Simulation (LES). The objective of this study is to evaluate the performance of LES in modelling non-premixed combustion using a commercial software, FLUENT, and investigate the effects of the grid density and chemistry models employed on the accuracy of the simulation results. A comparison has also been made between LES and Reynolds Averaged Navier-Stokes (RANS) predictions. For LES grid sensitivity test, 2.3 and 6.2 million cell grids are employed with the equilibrium model. The chemistry model sensitivity analysis is achieved by comparing the simulation results from the equilibrium chemistry and steady flamelet models. The predictions of the mixture fraction, axial velocity, species mass fraction and temperature by LES are in good agreement with the experimental data. The LES results are similar for the two chemistry models but influenced considerably by the grid resolution in the inner flame and near-wall regions.
[1] N. Peters, "Laminar diffusion flamelet models in non-premixed
turbulent combustion,"Prog. Energy Comb.Sci., vol. 10, no. 3, pp. 319-
339, 1984.
[2] S. B. Pope, "PDF methods for turbulent reactive flows," Prog. Energy
and Comb. Sci., vol. 11, no. 2, pp. 119-192, 1985.
[3] A. R. Kerstein, "Linear-eddy modelling of turbulent transport. Part7.
Finite-rate chemistry and multi-stream mixing," J. Fluid Mech., vol.
240, pp. 289-313, 1992.
[4] A. Y. Klimenko and R. W. Bilger, "Conditional moment closure for
turbulent combustion," Prog. Energy Comb. Sci., vol. 25, no. 6, pp.
595-687, 1999.
[5] A. W. Cook, J. J. Riley, and G. Kosaly, "A laminar flamelet approach to
subgrid-scale chemistry in turbulent flows," Combustion and Flame, vol.
109, pp. 332-341, 1997.
[6] H. Pitsch and H. Steiner, "Large-eddy simulation of a turbulent piloted
methane/air diffusion flame (Sandia flame D)," Phys. Fluids, vol. 12, no.
10, pp. 2541-2554, 2000.
[7] C. D. Pierce and P. Moin, "Progress-variable approach for large-eddy
simulation of non-premixed turbulent combustion," J. Fluid Mech., vol.
504, pp. 73-97, 2004.
[8] H. Pitsch and M. Ihme, "An Unsteady/Flamelet Progress Variable
Method for LES of Nonpremixed Turbulent Combustion," in the43rd
AIAA Aerospace Sciences Meeting and Exhibit, Nevada, 2005.
[9] K. Mahesh, G. Constantinescu, S. Apte, G. Iaccarino, F. Ham, and P.
Moin, "Large-eddy simulation of reacting turbulent flows in complex
geometries," Journal of Applied Mechanics, vol. 73, pp. 374-381, 2006.
[10] K. Wang, Z. Yang, and J. J. McGuirk, "Large eddy simulation of
turbulent diffusion flame combustion using a conserved scalar
methodology," Journal of Aerospace Power, vol. 22, no. 7, pp. 1106-
1117, 2007.
[11] A. Leonard, "Energy Cascade in Large-eddy Simulations of Turbulent
Fluid Flows," Adv. Geophys., vol. 18A, pp. 237-248, 1974.
[12] P. J. Colucci, F. A. Jaberi, P. Givi, and S. B. Pope, "Filtered density
function for large eddy simulation of turbulent reacting flows," Phys.
Fluids, vol. 10, pp. 499-515, 1998.
[13] S. B. Pope, Turbulent Flows, New York: Cambridge University Press,
2000, ch. 13.
[14] J. Smagorinsky, "General circulation experiments with the primitive
equations: I. The basic experiment," Monthly Weather Review, vol. 91,
no. 3, pp. 99-164, 1963.
[15] H. Pitsch, "Large-eddy simulation of turbulent combustion," Annu. Rev.
Fluid Mech., vol. 38, pp. 453-482,2006.
[16] Y. R. Sivathanu and G. M. Faeth, "Generalized state relationships for
scalar properties in non-premixed hydrocarbon/air flames," Combustion
and Flame, vol. 82, pp. 211-230, 1990.
[17] N. Peters, Turbulent Combustion, Cambridge, UK: Cambridge
University Press, 2000, ch. 3.
[18] R. W. Bilger, "Turbulent jet diffusion flames," Prog. Energy and Comb.
Sci., vol. 1, pp. 87-109, 1976.
[19] R.W. Bilger, "Turbulent flows with nonpremixed reactants," in: Topics
in Applied Physics, vol. 44, P. A. Libby and F. A. Williams, Eds. New
York: Springer-Verlag, 1980, pp. 65-113.
[20] P. A. Libby and F. A. Williams, "Fundamental aspects," in: Topics in
Applied Physics, vol. 44, P. A. Libby and F. A. Williams, Eds. New
York: Springer-Verlag, 1980, pp. 1-43.
[21] E. E. O-Brien, "The probability density function (pdf) approach to
reacting turbulent flows," in: Topics in Applied Physics, vol. 44, P. A.
Libby and F. A. Williams, Eds. New York: Springer-Verlag, 1980, pp.
185-218.
[22] S. B. Pope, "Pdf method for turbulent reacting flows," Prog. Energy
Combust. Sci., vol. 11, pp. 119-195, 1985.
[23] R. P. Rhodes, P. T. Harsha, and C. E. Peters, "Turbulent kinetic energy
analyses of hydrogen-air diffusion flames," ActaAstronautica, vol. 1, pp.
443-470, 1974.
[24] W. Kolbe and W. Kollmann, "Prediction of turbulent diffusion flames
with a four-equation turbulence model," ActaAstronautica, vol. 7, pp.
91-104, 1980.
[25] A. W. Cook and J. J. Riley, "A subgrid model for equilibrium chemistry
in turbulent flow," Phys. Fluids, vol. 6, pp. 2868-2870, 1994.
[26] N. Peters, "Local quenching due to flame stretch and non-premixed
turbulent combustion," Combust. Sci. Technol., vol. 30, pp. 1-17, 1983.
[27] F. K. Owen, L. J. Spadaccini, and C. T. Bowman, "Pollutant formation
and energy release in confined turbulent diffusion flames,"Proc.
Combust. Inst., vol. 16, pp. 105-117, 1976.
[28] J. A. Langford and R. D. Moser, "Optimal LES formulations for
isotropic turbulence," J. Fluid Mech., vol. 398, pp. 321-346, 1999.
[29] P. Sagaut, Large Eddy Simulation for Incompressible Flows, Berlin:
Springer, 2001, ch. 10.
[30] B. Wegner, A. Maltsev, C. Schneider, A. Sadiki, A. Dreizler, and J.
Janika, "Assessment of unsteady RANS in predicting swirl flow
instability based on LES and experiments," Int. J. Heat Fluid Flow, vol.
25, no. 3, pp. 528-536, 2004.
[1] N. Peters, "Laminar diffusion flamelet models in non-premixed
turbulent combustion,"Prog. Energy Comb.Sci., vol. 10, no. 3, pp. 319-
339, 1984.
[2] S. B. Pope, "PDF methods for turbulent reactive flows," Prog. Energy
and Comb. Sci., vol. 11, no. 2, pp. 119-192, 1985.
[3] A. R. Kerstein, "Linear-eddy modelling of turbulent transport. Part7.
Finite-rate chemistry and multi-stream mixing," J. Fluid Mech., vol.
240, pp. 289-313, 1992.
[4] A. Y. Klimenko and R. W. Bilger, "Conditional moment closure for
turbulent combustion," Prog. Energy Comb. Sci., vol. 25, no. 6, pp.
595-687, 1999.
[5] A. W. Cook, J. J. Riley, and G. Kosaly, "A laminar flamelet approach to
subgrid-scale chemistry in turbulent flows," Combustion and Flame, vol.
109, pp. 332-341, 1997.
[6] H. Pitsch and H. Steiner, "Large-eddy simulation of a turbulent piloted
methane/air diffusion flame (Sandia flame D)," Phys. Fluids, vol. 12, no.
10, pp. 2541-2554, 2000.
[7] C. D. Pierce and P. Moin, "Progress-variable approach for large-eddy
simulation of non-premixed turbulent combustion," J. Fluid Mech., vol.
504, pp. 73-97, 2004.
[8] H. Pitsch and M. Ihme, "An Unsteady/Flamelet Progress Variable
Method for LES of Nonpremixed Turbulent Combustion," in the43rd
AIAA Aerospace Sciences Meeting and Exhibit, Nevada, 2005.
[9] K. Mahesh, G. Constantinescu, S. Apte, G. Iaccarino, F. Ham, and P.
Moin, "Large-eddy simulation of reacting turbulent flows in complex
geometries," Journal of Applied Mechanics, vol. 73, pp. 374-381, 2006.
[10] K. Wang, Z. Yang, and J. J. McGuirk, "Large eddy simulation of
turbulent diffusion flame combustion using a conserved scalar
methodology," Journal of Aerospace Power, vol. 22, no. 7, pp. 1106-
1117, 2007.
[11] A. Leonard, "Energy Cascade in Large-eddy Simulations of Turbulent
Fluid Flows," Adv. Geophys., vol. 18A, pp. 237-248, 1974.
[12] P. J. Colucci, F. A. Jaberi, P. Givi, and S. B. Pope, "Filtered density
function for large eddy simulation of turbulent reacting flows," Phys.
Fluids, vol. 10, pp. 499-515, 1998.
[13] S. B. Pope, Turbulent Flows, New York: Cambridge University Press,
2000, ch. 13.
[14] J. Smagorinsky, "General circulation experiments with the primitive
equations: I. The basic experiment," Monthly Weather Review, vol. 91,
no. 3, pp. 99-164, 1963.
[15] H. Pitsch, "Large-eddy simulation of turbulent combustion," Annu. Rev.
Fluid Mech., vol. 38, pp. 453-482,2006.
[16] Y. R. Sivathanu and G. M. Faeth, "Generalized state relationships for
scalar properties in non-premixed hydrocarbon/air flames," Combustion
and Flame, vol. 82, pp. 211-230, 1990.
[17] N. Peters, Turbulent Combustion, Cambridge, UK: Cambridge
University Press, 2000, ch. 3.
[18] R. W. Bilger, "Turbulent jet diffusion flames," Prog. Energy and Comb.
Sci., vol. 1, pp. 87-109, 1976.
[19] R.W. Bilger, "Turbulent flows with nonpremixed reactants," in: Topics
in Applied Physics, vol. 44, P. A. Libby and F. A. Williams, Eds. New
York: Springer-Verlag, 1980, pp. 65-113.
[20] P. A. Libby and F. A. Williams, "Fundamental aspects," in: Topics in
Applied Physics, vol. 44, P. A. Libby and F. A. Williams, Eds. New
York: Springer-Verlag, 1980, pp. 1-43.
[21] E. E. O-Brien, "The probability density function (pdf) approach to
reacting turbulent flows," in: Topics in Applied Physics, vol. 44, P. A.
Libby and F. A. Williams, Eds. New York: Springer-Verlag, 1980, pp.
185-218.
[22] S. B. Pope, "Pdf method for turbulent reacting flows," Prog. Energy
Combust. Sci., vol. 11, pp. 119-195, 1985.
[23] R. P. Rhodes, P. T. Harsha, and C. E. Peters, "Turbulent kinetic energy
analyses of hydrogen-air diffusion flames," ActaAstronautica, vol. 1, pp.
443-470, 1974.
[24] W. Kolbe and W. Kollmann, "Prediction of turbulent diffusion flames
with a four-equation turbulence model," ActaAstronautica, vol. 7, pp.
91-104, 1980.
[25] A. W. Cook and J. J. Riley, "A subgrid model for equilibrium chemistry
in turbulent flow," Phys. Fluids, vol. 6, pp. 2868-2870, 1994.
[26] N. Peters, "Local quenching due to flame stretch and non-premixed
turbulent combustion," Combust. Sci. Technol., vol. 30, pp. 1-17, 1983.
[27] F. K. Owen, L. J. Spadaccini, and C. T. Bowman, "Pollutant formation
and energy release in confined turbulent diffusion flames,"Proc.
Combust. Inst., vol. 16, pp. 105-117, 1976.
[28] J. A. Langford and R. D. Moser, "Optimal LES formulations for
isotropic turbulence," J. Fluid Mech., vol. 398, pp. 321-346, 1999.
[29] P. Sagaut, Large Eddy Simulation for Incompressible Flows, Berlin:
Springer, 2001, ch. 10.
[30] B. Wegner, A. Maltsev, C. Schneider, A. Sadiki, A. Dreizler, and J.
Janika, "Assessment of unsteady RANS in predicting swirl flow
instability based on LES and experiments," Int. J. Heat Fluid Flow, vol.
25, no. 3, pp. 528-536, 2004.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:64735", author = "J. Dumrongsak and A. M. Savill", title = "Numerical Analysis and Sensitivity Study of Non-Premixed Combustion Using LES", abstract = "Non-premixed turbulent combustion Computational Fluid Dynamics (CFD) has been carried out in a simplified methanefuelled coaxial jet combustor employing Large Eddy Simulation (LES). The objective of this study is to evaluate the performance of LES in modelling non-premixed combustion using a commercial software, FLUENT, and investigate the effects of the grid density and chemistry models employed on the accuracy of the simulation results. A comparison has also been made between LES and Reynolds Averaged Navier-Stokes (RANS) predictions. For LES grid sensitivity test, 2.3 and 6.2 million cell grids are employed with the equilibrium model. The chemistry model sensitivity analysis is achieved by comparing the simulation results from the equilibrium chemistry and steady flamelet models. The predictions of the mixture fraction, axial velocity, species mass fraction and temperature by LES are in good agreement with the experimental data. The LES results are similar for the two chemistry models but influenced considerably by the grid resolution in the inner flame and near-wall regions.
", keywords = "Coaxial jet, reacting LES, non-premixed combustion, turbulent flow.", volume = "6", number = "12", pages = "2873-12", }
