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

Reynolds-Averaged Navier–Stokes and Large-Eddy Simulation Investigation of Lean Premixed Gas Turbine Combustor

[+] Author and Article Information
Sunil Patil

ANSYS, Inc.,
Ann Arbor, MI 48108
e-mail: Sunil.Patil@ansys.com

Federico Montanari

ANSYS, Inc.,
Lebanon, NH 03766
e-mail: Federico.Montanari@ansys.com

Contributed by the Aircraft Engine Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 26, 2014; final manuscript received May 6, 2015; published online June 23, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(12), 121506 (Jun 23, 2015) (8 pages) Paper No: GTP-14-1440; doi: 10.1115/1.4030793 History: Received July 26, 2014

Reynolds-averaged Navier–Stokes (RANS) and large-eddy simulations (LES) of a Siemens scaled combustor are compared against comprehensive experimental data. The steady RANS simulation modeled one quarter of the geometry with 8 M polyhedral cells using the shear stress transport (SST) k-ω model. Unsteady LES were performed on the quarter geometry (90 deg, 8 M cells) as well as the full geometry (360 deg, 32 M cells) using the wall-adapting local eddy-viscosity (WALE) subgrid model and dynamic evaluation of model coefficients. Aside from the turbulence model, all other models are identical for the RANS and LES. Combustion was modeled with the flamelet generated manifold (FGM) model, which represents the thermochemistry by mixture fraction and reaction progress. RANS simulations are performed using Zimont and Peters turbulent flame-speed (TFS) expressions with default model constants, as well as the kinetic rate from the FGM. The flame-speed stalls near the wall with the TFS models, predicting a flame brush that extends to the combustor outlet, which is inconsistent with measurements. The FGM kinetic source model shows improved flame position predictions. The LES predictions of mean and rms axial velocity, mixture fraction, and temperature do not show improvement over the RANS. All three simulations overpredict the turbulent mixing in the inner recirculation zone, causing flatter profiles than measurements. This overmixing is exacerbated in the 90 deg case. The experiments show evidence of heat loss, and the adiabatic simulations presented here might be improved by including wall heat-loss and radiation effects.

Copyright © 2015 by ASME
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Figures

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Fig. 1

Photo of DLR rig with Siemens gas turbine combustor

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Fig. 2

Photo of burner showing eight main swirlers and central pilot swirler with conical nozzle

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Fig. 3

Image showing fuel pipes (left side) and the swirl housing (right side)

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Fig. 4

Contours of reaction progress for (a) Peters TFS, (b) Zimont TFS, and (c) FGM kinetic rate mean reaction-progress source term closure

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Fig. 5

Plot of mean temperature on centerline: experiment (red dots), RANS TFM kinetic model (solid line), RANS Peters TFS (dashed line), and RANS Zimont TFS (dotted line)

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Fig. 6

Plot of mean axial velocity on centerline: see Fig. 5 for symbol definitions

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Fig. 7

Contours of instantaneous temperature (K) for the 90 deg sector (top) and the full 360 deg LES (bottom)

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Fig. 8

Contours of instantaneous velocity magnitude (m/s) at one time instant for the full 360 deg LES

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Fig. 9

(a) Mean axial velocity at y = 0 mm, (b) mean axial velocity at y = 20 mm, and (c) mean axial velocity at y = 39 mm

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Fig. 10

(a) RMS axial velocity at y = 0 mm and (b) RMS axial velocity at y = 39 mm

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Fig. 11

(a) Mean mixture fraction at y = 0 mm, (b) mean mixture fraction at y = 20 mm, (c) mean mixture fraction at y = 34 mm, and (d) mean mixture fraction at y = 39 mm

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Fig. 12

Mean mixture fraction for the full 360 deg LES. Values above 0.05 have been clipped to 0.05.

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Fig. 13

(a) Mean temperature at y = 0 mm (axis), (b) mean temperature at y = 20 mm, (c) mean temperature at y = 34 mm, and (d) mean temperature at y = 39 mm

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Fig. 14

Experimental instantaneous temperature versus mixture fraction scatter shots in the inner recirculation zone

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Fig. 15

(a) RMS temperature at y = 0 mm and (b) RMS temperature at y = 39 mm

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