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

Parametric Simulation of Turbulent Reacting Flow and Emissions in a Lean Premixed Reverse Flow Type Gas Turbine Combustor

[+] Author and Article Information
Daero Joung, Kang Y. Huh

Department of Mechanical Engineering,  Pohang University of Science and Technology, Pohang 790-784, South Korea

Yunho An

 Doosan Heavy Industries & Construction, Daejeon 305-811, South Korea

J. Eng. Gas Turbines Power 134(2), 021501 (Dec 09, 2011) (9 pages) doi:10.1115/1.4004375 History: Received January 11, 2011; Revised June 01, 2011; Published December 09, 2011; Online December 09, 2011

This paper describes simulation of a small stationary gas turbine combustor of a reverse flow, semi-silo type for power generation. The premixed coherent flame model (PCFM) is applied for partially premixed methane/air with an imposed downstream flame area density (FAD) to avoid flashback and incomplete combustion. Physical models are validated against the measurements of outlet temperature, product gas composition, and NO emission at the low operating pressure. Parametric study is performed to investigate the effect of load and pilot/total (P/T) fuel ratio on mixing characteristics and the resulting temperature distribution and pollutant emissions. As the P/T fuel ratio increases, the high temperature region over 1900 K enhances reaction of the mixture from the main nozzle in the primary mixing zone. For low P/T ratios, the pilot stream dilutes the mixture, on the contrary, to suppress reaction with an increasing height of the lifted flame. The NO is associated with the unmixedness as well as the mean temperature level and tends to increase with increasing load and P/T ratio. The high operating pressure does not affect overall velocity and temperature distribution, while it tends to increase NO and liner temperature under the given boundary conditions.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

A schematic diagram of the burner head

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Figure 2

Grid of about 5 × 106 cells for the whole combustor

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Figure 3

Grid sensitivity for about 5 and 12 × 106 cells along the centerline

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Figure 4

Distribution of the mean progress variable for different PCFM constants (1.34 atm, 100% load, P/T = 26.0%)

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Figure 5

Equilibrium flame structures (solid: 1.34 atm, dash: 1.34 atm with 4% water, dot: 13.9 atm)

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Figure 6

Profiles of mean temperature and mean concentrations of O2 , H2 O, UHC, CO, and NO at the outlet (1.34 atm, symbols: measurement, lines: calculation)

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Figure 7

Distribution of the mean equivalence ratio at the main (outside) and the pilot (inside) nozzle exits (1.34 atm, 100% load, P/T = 26.0%)

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Figure 8

Distribution of the mean equivalence ratio at the main (up) and the pilot (down) nozzle exits at 1.34 atm, 100% load (solid: P/T = 26.0%, dash: P/T = 20.5%, dot: P/T= 11.7%, dash dot: P/T = 0.0%)

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Figure 9

Distribution of the mean temperature for different P/T fuel ratios (1.34 atm, 100% load, P/T = 26.0%, 20.5%, 11.7%, 0.0%)

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Figure 10

Axial profiles of the mean and the standard deviation of equivalence ratio at 1.34 atm, 100% load (solid: P/T = 26.0%, dash: P/T = 20.5%, dot: P/T = 11.7%, dash dot: P/T = 0.0%)

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Figure 11

Axial profiles of the mean and the standard deviation of temperature at 1.34 atm, 100% load (solid: P/T = 26.0%, dash: P/T = 20.5%, dot: P/T = 11.7%, dash dot: P/T = 0.0%)

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Figure 12

Axial profiles of the mean and the standard deviation of equivalence ratio at 1.34 atm, 60% load (solid: P/T = 51.2%, dash: P/T = 41.1%, dot: P/T = 31.2%, dash dot: P/T = 22.1%)

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Figure 13

Axial profiles of the mean and the standard deviation of temperature at 1.34 atm, 60% load (solid: P/T = 51.2%, dash: P/T = 41.1%, dot: P/T = 31.2%, dash dot: P/T = 22.1%)

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Figure 14

Distribution of the wall temperature at 1.34 atm, 100% load (solid: P/T = 26.0%, dash: P/T = 20.5%, dot: P/T = 11.7%, dash dot: P/T = 0.0%)

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Figure 15

Distribution of the mean temperature at 13.9 atm, 100% load, and P/T = 27.6%

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Figure 16

Axial profiles of the mean equivalence ratio and the mean temperature at the 100% load (solid: 1.34 atm, P/T = 26.0%, dash: 13.9 atm, P/T = 27.6%)

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Figure 17

Distribution of the liner wall temperature at the 100% load (solid: 1.34 atm, P/T = 26.0%, dash: 13.9 atm, P/T = 27.6%)

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