Spectral and Timeresolved Radiation Measurements in a Model Gas Turbine Combustor

Koch, Rainer; Krebs, Werner; Jeckel, Rolf; Ganz, Benedikt; Wittig, Sigmar

doi:10.1115/94-gt-403

Cited by 6 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The contribution due to CO can be neglected due to very low concentration levels. Radiation emitted by CO2 and H20 is confined to defined spectral regions, the radiation bands [ 4] Hence, for an accurate prediction of radiant heat load, this pronounced spectral dependence has been taken into account by application of a Narrow Band Model which is described for example by Brewster To simplify the calculations, the combustion chamber is represented by a cube. The length of the edges have been selected in order to represent the mean lengths of the combustor.…”

Section: Radiation Reflected Radiation W W Wall Emissionmentioning

confidence: 99%

Detailed Analysis of the Thermal Wall Heat Load in Annular Combustors

Krebs

Walz

Hoffmann

et al. 1999

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

View full text Add to dashboard Cite

A detailed thermal analysis involving both measurements and calculations has been carried out in order to determine the wall heat load and to optimize the amount of cooling air for an annular combustor. In calculations, the convective wall heat flux has been detemined by application of a 3D Navier-Stokes Code. Furthermore, the radiation exchange between the hot combustion gases and the liner has been calculated using a multidimensional spectral approach.Although a quite high thermal power density is found within the combustion chamber the wall heat load is at a low level. Values are well below 80 kW/m2, due to the application of ceramic tiles which have a low thermal conductivity. The wall heat load is dominated by radiation emitted in the lower gas radiation bands (X < 2.9 gm). The convective wall heat flux is nearly balanced out by the sealing air which is discharged through gaps between the ceramic tiles. The cooling effect of the sealing air, however, is strongly influenced by the 3D near wall flow field in the combustion chamber. Nomenclature FtFl normal vector of surface Qc convective wall heat load (W/m 21 Qad radiant wall heat load (W/m 2] total wall heat load [W/m 2] radial coordinate [m] RD exit radius of diagonal swirler [m] axial velocity (m/s] swirl velocity [m/s] Tad adiabatic flame temperature [K] flame temperature [K) Tw wail temperature [K] 12 direction vector emissivity of the hot gases Eyi emissivity of the wall wavelength Stefan Boltzmann constant LW/K 8]

show abstract

Section: Radiation Reflected Radiation W W Wall Emissionmentioning

confidence: 99%

Detailed Analysis of the Thermal Wall Heat Load in Annular Combustors

Krebs

Walz

Hoffmann

et al. 1999

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

View full text Add to dashboard Cite

show abstract

“…Due to complexity of modelling radiative heat transfer, current radiation calculation practice takes into account only the mean temperature and species fields and ignores their turbulent fluctuations. Spectral and time-resolved measurements in a model gas turbine combustor by Koch et al (1994) have shown highly fluctuating intensities resulting from fluctuations in both temperature and the concentrations of radiating species; it is therefore important to include these fluctuations in radiation calculations. A small number of studies have attempted to develop modelling techniques to include turbulence effects in radiation calculations; these include the work by Song and Viskanta (1986), Kounalakis et al (1981) and Chan et al (1994).…”

Section: Modelling Of Turbulence/radiation Interactions In Combustionmentioning

confidence: 99%

Calculation of Radiative Heat Transfer in Combustion Systems

Malalasekera¹,

Versteeg²,

Henson³

et al. 2002

Clean Air

View full text Add to dashboard Cite

Most practical combustion systems involve complex geometry configurations and CFD techniques used for the calculation of flow and combustion in such geometries use body-fitted non-orthogonal mesh systems. This paper reviews some of the currently available radiative heat transfer calculation techniques suitable for such CFD applications. The Monte Carlo method, the discrete transfer method, the YIX method, the discrete ordinates method and the finite volume method are discussed and some notable applications related to combustion problems are reviewed. Comparative results using all the methods outlined are presented for bench mark problems and their applicability to complex geometry situations are discussed. Radiative heat flux predictions for an S.I. engine simulation are presented to demonstrate the capability of the discrete transfer method in a pent-roof complex geometry combustion chamber. The paper also describes a ray based technique for the handling of turbulence-radiation interactions in combustion and its application is demonstrated in the prediction of a methane diffusion flame.

show abstract

Spectrally resolved measurements of radiative heat transfer in a gas turbine combustor

Moss

Stewart

2004

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

Spectral and Timeresolved Radiation Measurements in a Model Gas Turbine Combustor

Cited by 6 publications

References 4 publications

Detailed Analysis of the Thermal Wall Heat Load in Annular Combustors

Detailed Analysis of the Thermal Wall Heat Load in Annular Combustors

Calculation of Radiative Heat Transfer in Combustion Systems

Spectrally resolved measurements of radiative heat transfer in a gas turbine combustor

Contact Info

Product

Resources

About