Lean premixed combustion is widely used to achieve a better compromise between nitric oxide (NOx) emissions and combustion efficiency (related to CO levels). However, combustor operation near the lean blowout (LBO) limit can render the flame unstable and lead to oscillations, flashback, or extinction, thereby limiting the potential range of lean combustion application. Recent interest in integrated gasification combined cycle plants and syngas combustion requires an improved understanding of the role of hydrogen on the combustion process. Therefore, in the present study, combustion of pure methane and blended methane-hydrogen with hydrogen-levels up to 80% by volume has been conducted in a swirl stabilized premixed combustor. Particle imaging velocimetry (PIV) and OH* chemiluminescence imaging have been used in this study. Results show that there is a single-ringed structure of internal recirculation zone (IRZ) in the non-reacting flow, while in the reacting flows, there is a more complex flow pattern with a two-celled IRZ structure in which the axial velocity near the center-axis is oriented downstream. As the equivalence ratio decreases, the width of IRZ decreases in methane flames while it increases in hydrogen-enriched flames, and the flame shape changes from conical to an elongated columnar shape, especially in hydrogen-enriched flames. There are two different modes of vortex breakdown observed, spiral mode in methane flames and bubble mode in hydrogen-enriched flames. These differences between the behavior of the methane-only and hydrogen-enriched flames lead to different behavior of the flame as it approaches the lean blowout. The differences in the mechanisms of LBO in pure methane and hydrogen-enriched premixed flames are examined and explained in the present study.
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e-mail: szhu2@tigers.lsu.edu
e-mail: acharya@me.lsu.edu
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April 2012
Research Papers
An Experimental Study of Lean Blowout With Hydrogen-Enriched Fuels
Shengrong Zhu,
Shengrong Zhu
Turbine Innovation and Energy Research (TIER) Center, Department of Mechanical Engineering,
e-mail: szhu2@tigers.lsu.edu
Louisiana State University
, Baton Rouge, LA 70803
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Sumanta Acharya
Sumanta Acharya
Professor
Turbine Innovation and Energy Research (TIER) Center, Department of Mechanical Engineering,
e-mail: acharya@me.lsu.edu
Louisiana State University
, Baton Rouge, LA 70803
Search for other works by this author on:
Shengrong Zhu
Turbine Innovation and Energy Research (TIER) Center, Department of Mechanical Engineering,
Louisiana State University
, Baton Rouge, LA 70803e-mail: szhu2@tigers.lsu.edu
Sumanta Acharya
Professor
Turbine Innovation and Energy Research (TIER) Center, Department of Mechanical Engineering,
Louisiana State University
, Baton Rouge, LA 70803e-mail: acharya@me.lsu.edu
J. Eng. Gas Turbines Power. Apr 2012, 134(4): 041507 (10 pages)
Published Online: February 1, 2012
Article history
Received:
July 4, 2011
Accepted:
July 4, 2011
Online:
February 1, 2012
Published:
February 1, 2012
Citation
Zhu, S., and Acharya, S. (February 1, 2012). "An Experimental Study of Lean Blowout With Hydrogen-Enriched Fuels." ASME. J. Eng. Gas Turbines Power. April 2012; 134(4): 041507. https://doi.org/10.1115/1.4004742
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