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

Passive Control of Noise and Instability in a Swirl-Stabilized Combustor With the Use of High-Strength Porous Insert

[+] Author and Article Information
Daniel Sequera

Department of Mechanical Engineering,  University of Alabama, Tuscaloosa, AL 35406

Ajay K. Agrawal

Department of Mechanical Engineering,  University of Alabama, Tuscaloosa, AL 35406aagrawal@eng.ua.edu

J. Eng. Gas Turbines Power 134(5), 051505 (Mar 05, 2012) (11 pages) doi:10.1115/1.4004740 History: Received June 28, 2011; Accepted July 06, 2011; Published March 05, 2012; Online March 05, 2012

Swirl-stabilized combustion and porous inert medium (PIM) combustion are two methods that have been used extensively, although independently, for flame stabilization. In this study, the two concepts are combined so that the porous insert serves as a passive device to mitigate combustion noise and instabilities. A properly shaped PIM is placed within the combustor to directly influence the turbulent flow field and vortical and/or shear layer structures associated with the outer recirculation zone and inner recirculation zone. After presenting the concept, the paper provides a conceptual understanding of the changes in the mean flow field caused by the PIM. Combustion experiments were conducted at atmospheric pressure using HfC/SiC coated open-cell foam structures of different pore sizes and shapes. Measurements of sound pressure level (SPL) and CO and NOx emissions were taken for different equivalence ratios and reactant flow rates. Combustion mode and PIM geometry to decrease the SPL are identified. The results show that the porous insert can reduce combustion noise without adversely affecting NOx and CO emissions. Experiments show that the proposed concept can also mitigate combustion instabilities encountered at high reactant flow rate.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Porous insert within a swirl-stabilized combustor

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Figure 2

Velocity vectors for Φ = 0.58: (a) without PIM, (b) with PIM

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Figure 3

Velocity vectors of reacting flow at Φ = 0.58: (a) axial velocity, (b) swirl velocity, (c) radial velocity; at different axial locations (Z): 10 mm (top), 20 mm (middle), 30 mm (bottom)

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Figure 4

Schematic diagram of experimental setup

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Figure 5

Photograph of a porous insert

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Figure 6

Description and schematic diagram of PIM configurations

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Figure 7

Power spectra for Q = 300 SLPM, Φ = 0.7: (a) configuration A, (b) configuration B, (c) configuration C, (d) configuration D

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Figure 8

Power spectra for Q = 300 SLPM, Φ = 0.8: (a) configuration A (b) configuration B, (c) configuration C, (d) configuration D

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Figure 9

Flame images: (a) with PIM interior combustion, (b) with PIM surface combustion

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Figure 10

Schematic diagram illustrating stabilization mechanism: (a) interior combustion (b) surface combustion

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Figure 11

Power spectra for Q = 300 SLPM, Φ = 0.7: (a) configuration E, (b) configuration F, (c) configuration G, (d) configuration H

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Figure 12

Power spectra for Q = 300 SLPM, Φ = 0.7: (a) configuration E, (b) configuration F, (c) configuration G, (d) configuration H

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Figure 13

Power spectra for Q = 600 SLPM, Φ = 0.7: (a) configuration A, (b) configuration D, (c) configuration G, (d) configuration H

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Figure 14

Power spectra for Q = 600 SLPM, Φ = 0.8: (a) configuration A, (b) configuration D, (c) configuration G, (d) configuration H

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Figure 15

CO and NOx emissions for Q = 300 SLPM, Φ = 0.8, Ti  = 100 °C: (a) CO, (b) NOx

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Figure 16

CO and NOx emissions for Q = 600 SLPM, Φ = 0.8, Ti  = 120 °C: (a) CO, (b) NOx

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