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.
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e-mail: aagrawal@eng.ua.edu
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Research Papers
Passive Control of Noise and Instability in a Swirl-Stabilized Combustor With the Use of High-Strength Porous Insert
Daniel Sequera,
Daniel Sequera
Department of Mechanical Engineering,
University of Alabama
, Tuscaloosa, AL 35406
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Ajay K. Agrawal
Ajay K. Agrawal
Department of Mechanical Engineering,
e-mail: aagrawal@eng.ua.edu
University of Alabama
, Tuscaloosa, AL 35406
Search for other works by this author on:
Daniel Sequera
Department of Mechanical Engineering,
University of Alabama
, Tuscaloosa, AL 35406
Ajay K. Agrawal
Department of Mechanical Engineering,
University of Alabama
, Tuscaloosa, AL 35406e-mail: aagrawal@eng.ua.edu
J. Eng. Gas Turbines Power. May 2012, 134(5): 051505 (11 pages)
Published Online: March 5, 2012
Article history
Received:
June 28, 2011
Accepted:
July 6, 2011
Online:
March 5, 2012
Published:
March 5, 2012
Citation
Sequera, D., and Agrawal, A. K. (March 5, 2012). "Passive Control of Noise and Instability in a Swirl-Stabilized Combustor With the Use of High-Strength Porous Insert." ASME. J. Eng. Gas Turbines Power. May 2012; 134(5): 051505. https://doi.org/10.1115/1.4004740
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