Large-eddy simulation of a piloted premixed jet burner

Abstract A three-stream flamelet/progress variable model is applied to the Sydney piloted premixed jet burner (PPJB). Using experimental data, a prior model evaluation is performed to assess critical modeling assumptions regarding the applicability of this formulation to partially-premixed combustion, the statistical representation of the scalar mixing, and the joint PDF-closure. A Dirichlet distribution, as generalization of the beta distribution, is introduced to represent the interaction between the two mixture fractions that are associated with the fuel, pilot, and coflow streams. Comparisons with experimental data are performed to demonstrate the accuracy of this closure-model. Following this prior model evaluation, the three-stream combustion model is applied to large-eddy simulation, and calculations of all four burner configurations, designated as PM1-{50, 100, 150, 200}, are performed. Through comparisons with experimental data and equilibrium computations it was found that the flow-field is sensitive to the scalar inflow composition, and scalar boundary conditions consistent with experimental measurements were used for all simulations. The effect of wall heat-losses on the temperature and species profiles is assessed in an approximate way, suggesting that species profiles are unaffected by the heat-transfer between pilot and coflow streams. Comparisons of statistical results and thermo-chemical correlations show that the model is capable of predicting flow-field, temperature, and major species profiles. The simulations over-predict the fuel-consumption for PM1-150 and PM1-200, which has also been observed in previous investigations. Aspects regarding model extensions to account for heat-losses and transient extinction/re-ignition processes are discussed.

[1]  M. Rogers,et al.  A priori testing of subgrid models for chemically reacting non-premixed turbulent shear flows , 1997, Journal of Fluid Mechanics.

[2]  Matthias Ihme,et al.  LES flamelet modeling of a three-stream MILD combustor: Analysis of flame sensitivity to scalar inflow conditions , 2011 .

[3]  Assaad R. Masri,et al.  The compositional structure of highly turbulent piloted premixed flames issuing into a hot coflow , 2009 .

[4]  Stephen B. Pope,et al.  PDF calculations of piloted premixed jet flames , 2011 .

[5]  James F. Driscoll,et al.  Vortex-shedding and mixing layer effects on periodic flashback in a lean premixed prevaporized gas turbine combustor , 2009 .

[6]  Heinz Pitsch,et al.  Prediction of local extinction and re-ignition effects in non-premixed turbulent combustion using a flamelet/progress variable approach , 2005 .

[7]  M. Dunn.  Finite-Rate Chemistry Effects in Turbulent Premixed Combustion , 2008 .

[8]  Large-Eddy Simulation of a Jet-in-Hot-Coflow Burner Operating in the Oxygen-Diluted Combustion Regime , 2012 .

[9]  N. L. Johnson,et al.  Continuous Multivariate Distributions, Volume 1: Models and Applications , 2019 .

[10]  P. Moin,et al.  Progress-variable approach for large-eddy simulation of non-premixed turbulent combustion , 2004, Journal of Fluid Mechanics.

[11]  Matthias Ihme,et al.  Prediction of autoignition in a lifted methane/air flame using an unsteady flamelet/progress variable model , 2010 .

[12]  R. Barlow,et al.  Finite Rate Chemistry Effects in Highly Sheared Turbulent Premixed Flames , 2010 .

[13]  Jian Zhang,et al.  Regularization of reaction progress variable for application to flamelet-based combustion models , 2012, J. Comput. Phys..

[14]  Assaad R. Masri,et al.  A new piloted premixed jet burner to study strong finite-rate chemistry effects , 2007 .

[15]  Hukam Chand Mongia,et al.  TAPS: A Fourth Generation Propulsion Combustor Technology for Low Emissions , 2003 .

[16]  W. Shyy,et al.  Characterization of Flow Field Structure and Species Composition in a Shear Coaxial Rocket GH2/GO2 Injector: Modeling of Wall Heat Losses , 2011 .

[17]  Parviz Moin,et al.  An evaluation of the assumed beta probability density function subgrid-scale model for large eddy simulation of nonpremixed, turbulent combustion with heat release , 2000 .

[18]  N. Peters.  Laminar diffusion flamelet models in non-premixed turbulent combustion , 1984 .

[19]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[20]  Christophe Duwig,et al.  Large Eddy Simulations of a piloted lean premix jet flame using finite-rate chemistry , 2011 .

[21]  A. Lefebvre.  Gas Turbine Combustion , 1983 .

[22]  Heinz Pitsch,et al.  Prediction of extinction and reignition in nonpremixed turbulent flames using a flamelet/progress variable model: 1. A priori study and presumed PDF closure , 2008 .