Meng, FL
1997
Comprehensive Model for Lean Premixed Combustion in Industrial Gas Turbines - Part II. Application
Meng, F.L.; Brewster, B.S. and Smoot, L.D.
Presented at the Spring Meeting of the Western States Section/The Combustion Institute, Sandia National Laboratories, Livermore, California, April 14-15, 1997. Funded by US Department of Energy.
A new comprehensive COmbustion Simulation MOdel for Gas Turbines (COSMO/GT) has been developed for simulating modern gas turbine combustors. The model includes the capability of simulating lean premixed combustion of methane (or natural gas) and air, and uses and unstructured-grid flow solver to accommodate geometrical complexity. In our earlier paper we extended the velocity-composition PDF approach to an unstructured grid platform for modeling two-dimensional, axisymmetric, lean premixed turbulent combustion in a lab-scale gas turbine combustor. In this paper, the extension of this PDF approach to a three-dimensional, unstructured grid is reported. The turbulence/chemistry interaction is modeled using the velocity-composition, Monte-Carlo PDF approach coupled with a five-step kinetic mechanism of methane and air for calculating CO and NO emissions. In order to increase the calculation speed of the PDF algorithm, in situ tabulation for chemical reaction and a zonal search method for locating particle positions are used. Validation of this model for and axisymmetric, lab-scale gas turbine combustor is described in a companion paper. Application of this model has been initiated by modeling lean, premixed combustion of natural gas and air in three-dimensional gas turbine combustors.
1996
Modeling of Industrial Gas Turbine Combustors
Meng, F.L.; Farmer, J.R.; Brewster, B.S. and Smoot, L.D.
Proceedings of the Fall 1996 Meeting of the Western States Section / The Combustion Institute, The University of Southern California, Los Angeles, California, October 28-29, 1996. Funded by ACERC.
A new model has been developed for simulating modern gas turbine combustors. The new model includes the capability of simulating lean, premixed combustion of methane (or natural gas) and air, and uses and unstructured-grid flow solver to accommodate geometrical complexity. The set of incompressible, steady state, Navier-Stokes equations is solved using a co-located, equal-order, control volume finite element method. The convection term is treated using the mass-weighted, skew upwind scheme, and the diffusion, pressure gradient, and source terms are interpolated linearly in each element. Turbulence is modeled using the kappa-epsilon model. Convective and radiative heat losses are modeled using a wall function method and a discrete ordinates method, respectively. The interaction between turbulence and chemistry is modeled using the velocity-composition Monte-Carlo PDF approach, coupled with a multiple-step reaction mechanism for methane and air. Validation of the code has been initiated by modeling lean, premixed combustion (Phi = 0.8) of natural gas and air in a laboratory-scale, gas turbine combustor with a simple, two-step kinetic mechanism for CH4-O2. Comparison with detailed measurements is forthcoming. Application to industrial gas turbine combustor components is also underway.
Meng, FL
1997
Comprehensive Model for Lean Premixed Combustion in Industrial Gas Turbines - Part II. Application
Meng, F.L.; Brewster, B.S. and Smoot, L.D.
Presented at the Spring Meeting of the Western States Section/The Combustion Institute, Sandia National Laboratories, Livermore, California, April 14-15, 1997. Funded by US Department of Energy.
A new comprehensive COmbustion Simulation MOdel for Gas Turbines (COSMO/GT) has been developed for simulating modern gas turbine combustors. The model includes the capability of simulating lean premixed combustion of methane (or natural gas) and air, and uses and unstructured-grid flow solver to accommodate geometrical complexity. In our earlier paper we extended the velocity-composition PDF approach to an unstructured grid platform for modeling two-dimensional, axisymmetric, lean premixed turbulent combustion in a lab-scale gas turbine combustor. In this paper, the extension of this PDF approach to a three-dimensional, unstructured grid is reported. The turbulence/chemistry interaction is modeled using the velocity-composition, Monte-Carlo PDF approach coupled with a five-step kinetic mechanism of methane and air for calculating CO and NO emissions. In order to increase the calculation speed of the PDF algorithm, in situ tabulation for chemical reaction and a zonal search method for locating particle positions are used. Validation of this model for and axisymmetric, lab-scale gas turbine combustor is described in a companion paper. Application of this model has been initiated by modeling lean, premixed combustion of natural gas and air in three-dimensional gas turbine combustors.
1996
Modeling of Industrial Gas Turbine Combustors
Meng, F.L.; Farmer, J.R.; Brewster, B.S. and Smoot, L.D.
Proceedings of the Fall 1996 Meeting of the Western States Section / The Combustion Institute, The University of Southern California, Los Angeles, California, October 28-29, 1996. Funded by ACERC.
A new model has been developed for simulating modern gas turbine combustors. The new model includes the capability of simulating lean, premixed combustion of methane (or natural gas) and air, and uses and unstructured-grid flow solver to accommodate geometrical complexity. The set of incompressible, steady state, Navier-Stokes equations is solved using a co-located, equal-order, control volume finite element method. The convection term is treated using the mass-weighted, skew upwind scheme, and the diffusion, pressure gradient, and source terms are interpolated linearly in each element. Turbulence is modeled using the kappa-epsilon model. Convective and radiative heat losses are modeled using a wall function method and a discrete ordinates method, respectively. The interaction between turbulence and chemistry is modeled using the velocity-composition Monte-Carlo PDF approach, coupled with a multiple-step reaction mechanism for methane and air. Validation of the code has been initiated by modeling lean, premixed combustion (Phi = 0.8) of natural gas and air in a laboratory-scale, gas turbine combustor with a simple, two-step kinetic mechanism for CH4-O2. Comparison with detailed measurements is forthcoming. Application to industrial gas turbine combustor components is also underway.