Experimental and Numerical Study of Flameless Combustion in a Model Gas Turbine Combustor

Flameless combustion is an attractive solution to address existing problems of emissions and stability when operating gas turbine combustors. Theoretical, numerical and experimental approaches were used to study the flameless gas turbine combustor. The emissions and combustion stability were measured and the limits of the flameless regime are discussed. Using experimental techniques and Large Eddy Simulation (LES), detailed knowledge of the flow field and the oxidation dynamics was obtained. In particular the relation between the turbulent coherent structures dynamics and the flameless oxidation was highlighted. A model for flameless combustion simulations including detailed chemistry was derived. The theoretical analysis of the flameless combustion provides 2 non-dimensional numbers that define the range of the flameless mode. It was determined that the mixture that is ignited and burnt is composed of ∼ 50% of fresh gases and ∼ 50% vitiated gases.

[1]  S. H. Kim,et al.  Conditional moment closure modeling of turbulent nonpremixed combustion in diluted hot coflow , 2005 .

[2]  Bassam B. Dally,et al.  Effect of fuel mixture on moderate and intense low oxygen dilution combustion , 2004 .

[3]  M. Gharib,et al.  On errors of digital particle image velocimetry , 1997 .

[4]  M. Lesieur,et al.  Large-eddy simulation of transition to turbulence in a boundary layer developing spatially over a flat plate , 1996, Journal of Fluid Mechanics.

[5]  X. Bai,et al.  High‐order Cartesian grid method for calculation of incompressible turbulent flows , 2001 .

[6]  J. Wunning,et al.  Flameless oxidation to reduce thermal no-formation , 1997 .

[7]  P. Moin,et al.  A dynamic model for subgrid-scale variance and dissipation rate of a conserved scalar , 1998 .

[8]  Norbert Peters,et al.  The detailed flame structure of highly stretched turbulent premixed methane-air flames , 1996 .

[9]  Pedro J. Coelho,et al.  Numerical simulation of a mild combustion burner , 2001 .

[10]  Masashi Katsuki,et al.  The science and technology of combustion in highly preheated air , 1998 .

[11]  T. Poinsot,et al.  Theoretical and numerical combustion , 2001 .

[12]  Jinhee Jeong,et al.  On the identification of a vortex , 1995, Journal of Fluid Mechanics.

[13]  Laszlo Fuchs,et al.  Large eddy simulation of the proximal region of a spatially developing circular jet , 1996 .

[14]  C. Duwig,et al.  Study of a confined turbulent jet : Influence of combustion and pressure , 2007 .

[15]  E. Gutmark,et al.  Experimental Study of Flameless Combustion in Gas Turbine Combustors , 2006 .

[16]  Parviz Moin,et al.  Method for Generating Equilibrium Swirling Inflow Conditions , 1998 .

[17]  Chi-Wang Shu,et al.  Efficient Implementation of Weighted ENO Schemes , 1995 .

[18]  Michael Flamme,et al.  New combustion systems for gas turbines (NGT) , 2004 .

[19]  O. Métais,et al.  Vortex control of bifurcating jets: A numerical study , 2002 .

[20]  Bassam B. Dally,et al.  Modeling turbulent reacting jets issuing into a hot and diluted coflow , 2005 .

[21]  V. Sherbaum,et al.  Basic thermodynamics of FLOXCOM, the low-NOx gas turbines adiabatic combustor , 2004 .

[22]  Ulrich Maas,et al.  Simplifying chemical kinetics: Intrinsic low-dimensional manifolds in composition space , 1992 .