The computational modeling of soot in aircraft engines is a formidable challenge, not only due to the multi-scale interactions with the turbulent combustion process but the equally complex physical and chemical processes that drive the conversion of gas-phase fuel molecules into solid-phase particles. In particular, soot formation is highly sensitive to the gas-phase composition and temporal fluctuations in a turbulent background flow. In this work, a large eddy simulation (LES) framework is used to study soot formation in a model aircraft combustor with swirl-based fuel and air injection. Two different configurations are simulated: one with and one without secondary oxidation jets. Specific attention is paid to the LES numerical implementation such that the discrete solver minimizes the dissipation of kinetic energy. Simulation of the model combustor shows that the LES approach captures the two recirculation zones necessary for flame stabilization very accurately. Further, the model reasonably predicts the temperature profiles inside the combustor. The model also captures variation in soot volume fraction with global equivalence ratio. The structure of the soot field suggests that when secondary oxidation jets are present, the inner recirculation region becomes fuel lean and soot generation is completely suppressed. Further, the soot field is highly intermittent suggesting that a very restrictive set of gas phase conditions promote soot generation.
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ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4976-7
PROCEEDINGS PAPER
Large Eddy Simulation of Soot Formation in a Model Gas Turbine Combustor Available to Purchase
Heeseok Koo,
Heeseok Koo
University of Michigan, Ann Arbor, MI
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Malik Hassanaly,
Malik Hassanaly
University of Michigan, Ann Arbor, MI
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Venkat Raman,
Venkat Raman
University of Michigan, Ann Arbor, MI
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Michael E. Mueller,
Michael E. Mueller
Princeton University, Princeton, NJ
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Klaus Peter Geigle
Klaus Peter Geigle
German Aerospace Center, Stuttgart, Germany
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Heeseok Koo
University of Michigan, Ann Arbor, MI
Malik Hassanaly
University of Michigan, Ann Arbor, MI
Venkat Raman
University of Michigan, Ann Arbor, MI
Michael E. Mueller
Princeton University, Princeton, NJ
Klaus Peter Geigle
German Aerospace Center, Stuttgart, Germany
Paper No:
GT2016-57952, V04BT04A049; 10 pages
Published Online:
September 20, 2016
Citation
Koo, H, Hassanaly, M, Raman, V, Mueller, ME, & Geigle, KP. "Large Eddy Simulation of Soot Formation in a Model Gas Turbine Combustor." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 4B: Combustion, Fuels and Emissions. Seoul, South Korea. June 13–17, 2016. V04BT04A049. ASME. https://doi.org/10.1115/GT2016-57952
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