The stability of hydrogen combustion under lean premixed conditions in a back-mixed jet-stirred reactor (JSR), is experimentally and numerically investigated. The goal is to understand the mechanism of flame extinction in this recirculation-stabilized flame environment. Extinction is achieved by holding the air flow rate constant and gradually decreasing the flow rate of the hydrogen fuel until a blowout event occurs. In order to gain insight on the mechanism controlling blowout, two dimensional computational fluid dynamic (CFD) simulations are carried out for the lean premixed combustion (LPM) of hydrogen as the fuel flow rate is reduced. The CFD model illustrates the evolution of the flow-field, temperature profiles, and flame structure within the JSR as blowout is approached. A single element chemical reactor network (CRN) consisting of a plug flow reactor (PFR) with recirculation is constructed based on the results of the CFD simulations, and its prediction of blowout is in good agreement with the experimental results. The chemical mechanism of Li et al. is used in both the CFD and CRN models, and GRI is used in the CRN for comparison. The modeling suggests that lean blowout does not occur with the flame in a spatially homogeneous condition, but rather under a zonal structure. Specifically, the flame is stabilized by the entrainment of combustion products from the re-circulation zone into the base of the reactant jet. The mixture of hot products and incoming premixed reactants proceeds through an ignition induction period followed by an ignition event. As the fuel flow decreases, the induction period increases and the ignition event is pushed further around the recirculation zone. Eventually, the induction period becomes so long that the ignition is incomplete at the point where the recirculating gas is entrained into the jet. This threshold leads to overall flame extinction.
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ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
June 11–15, 2012
Copenhagen, Denmark
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4468-7
PROCEEDINGS PAPER
Characterizing the Mechanism of Lean Blowout for a Recirculation-Stabilized Premixed Hydrogen Flame
Megan F. Karalus,
Megan F. Karalus
University of Washington, Seattle, WA
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K. Boyd Fackler,
K. Boyd Fackler
University of Washington, Seattle, WA
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Igor V. Novosselov,
Igor V. Novosselov
University of Washington, Seattle, WA
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John C. Kramlich,
John C. Kramlich
University of Washington, Seattle, WA
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Philip C. Malte
Philip C. Malte
University of Washington, Seattle, WA
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Megan F. Karalus
University of Washington, Seattle, WA
K. Boyd Fackler
University of Washington, Seattle, WA
Igor V. Novosselov
University of Washington, Seattle, WA
John C. Kramlich
University of Washington, Seattle, WA
Philip C. Malte
University of Washington, Seattle, WA
Paper No:
GT2012-68060, pp. 21-30; 10 pages
Published Online:
July 9, 2013
Citation
Karalus, MF, Fackler, KB, Novosselov, IV, Kramlich, JC, & Malte, PC. "Characterizing the Mechanism of Lean Blowout for a Recirculation-Stabilized Premixed Hydrogen Flame." Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 2: Combustion, Fuels and Emissions, Parts A and B. Copenhagen, Denmark. June 11–15, 2012. pp. 21-30. ASME. https://doi.org/10.1115/GT2012-68060
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