Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Large Eddy Simulation of a Pressurized, Partially Premixed Swirling Flame With Finite-Rate Chemistry

[+] Author and Article Information
Sandeep Jella

Siemens Canada Limited,
Montreal, QC H9P 1A5, Canada
e-mail: sandeep.jella@siemens.com

Pierre Gauthier, Gilles Bourque

Siemens Canada Limited,
Montreal, QC H9P 1A5, Canada

Jeffrey Bergthorson

McGill University,
Montreal, QC H3A 0G4, Canada

Ghenadie Bulat, Jim Rogerson, Suresh Sadasivuni

Siemens Industrial Turbomachinery,
Lincoln LN5 7FD, UK

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 23, 2017; final manuscript received March 29, 2018; published online July 10, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(11), 111505 (Jul 10, 2018) (9 pages) Paper No: GTP-17-1387; doi: 10.1115/1.4040007 History: Received July 23, 2017; Revised March 29, 2018

Finite-rate chemical effects at gas turbine conditions lead to incomplete combustion and well-known emissions issues. Although a thin flame front is preserved on an average, the instantaneous flame location can vary in thickness and location due to heat losses or imperfect mixing. Postflame phenomena (slow CO oxidation or thermal NO production) can be expected to be significantly influenced by turbulent eddy structures. Since typical gas turbine combustor calculations require insight into flame stabilization as well as pollutant formation, combustion models are required to be sensitive to the instantaneous and local flow conditions. Unfortunately, few models that adequately describe turbulence–chemistry interactions are tractable in the industrial context. A widely used model capable of employing finite-rate chemistry is the eddy dissipation concept (EDC) model of Magnussen. Its application in large eddy simulations (LES) is problematic mainly due to a strong sensitivity to the model constants, which were based on an isotropic cascade analysis in the Reynolds-averaged Navier–Stokes (RANS) context. The objectives of this paper are: (i) to formulate the EDC cascade idea in the context of LES; and (ii) to validate the model using experimental data consisting of velocity (particle image velocimetry (PIV) measurements) and major species (1D Raman measurements), at four axial locations in the near-burner region of a Siemens SGT-100 industrial gas turbine combustor.

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Fig. 1

The SGT-100 experimental rig schematic

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Fig. 2

Mesh distribution on 1/2 section of domain—darker areas are more refined

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Fig. 3

Qualitative flame shape

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Fig. 4

Time-averaged fields

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Fig. 5

Chemical Source Terms and Strain Rates

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Fig. 6

Comparisons with experiment - velocity field (top row: MEAN, bottom row: RMS)

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Fig. 7

Comparisons with experiment - temperatures

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Fig. 8

Comparisons with experiment—reactant mass fractions (top row: MEAN, bottom row: RMS)

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Fig. 9

Comparisons with experiment—product mass fractions (top row: MEAN, bottom row: RMS)

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Fig. 10

Pollutant formation—CO and thermal NO

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Fig. 11

OH and CO Karlovitz numbers

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Fig. 12

Comparisons with the RANS EDC at location 1



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