The computational modeling of soot in aircraft engines is a formidable challenge, not only due to the multiscale 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 the 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 promotes soot generation.
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March 2017
Research-Article
Large-Eddy Simulation of Soot Formation in a Model Gas Turbine Combustor
Heeseok Koo,
Heeseok Koo
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: heeseokkoo@gmail.com
University of Michigan,
Ann Arbor, MI 48109
e-mail: heeseokkoo@gmail.com
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Malik Hassanaly,
Malik Hassanaly
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: malik.hassanaly@gmail.com
University of Michigan,
Ann Arbor, MI 48109
e-mail: malik.hassanaly@gmail.com
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Venkat Raman,
Venkat Raman
Associate Professor
Mem. ASME
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: ramanvr@umich.edu
Mem. ASME
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: ramanvr@umich.edu
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Michael E. Mueller,
Michael E. Mueller
Assistant Professor
Mem. ASME
Department of Mechanical and
Aerospace Engineering,
Princeton University,
Princeton, NJ 08544
e-mail: muellerm@princeton.edu
Mem. ASME
Department of Mechanical and
Aerospace Engineering,
Princeton University,
Princeton, NJ 08544
e-mail: muellerm@princeton.edu
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Klaus Peter Geigle
Klaus Peter Geigle
Mem. ASME
German Aerospace Center (DLR),
Institution of Combustion Technology,
Pfaffenwaldring 38-40,
Stuttgart D-70569, Germany
e-mail: klauspeter.geigle@dlr.de
German Aerospace Center (DLR),
Institution of Combustion Technology,
Pfaffenwaldring 38-40,
Stuttgart D-70569, Germany
e-mail: klauspeter.geigle@dlr.de
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Heeseok Koo
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: heeseokkoo@gmail.com
University of Michigan,
Ann Arbor, MI 48109
e-mail: heeseokkoo@gmail.com
Malik Hassanaly
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: malik.hassanaly@gmail.com
University of Michigan,
Ann Arbor, MI 48109
e-mail: malik.hassanaly@gmail.com
Venkat Raman
Associate Professor
Mem. ASME
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: ramanvr@umich.edu
Mem. ASME
Department of Aerospace Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: ramanvr@umich.edu
Michael E. Mueller
Assistant Professor
Mem. ASME
Department of Mechanical and
Aerospace Engineering,
Princeton University,
Princeton, NJ 08544
e-mail: muellerm@princeton.edu
Mem. ASME
Department of Mechanical and
Aerospace Engineering,
Princeton University,
Princeton, NJ 08544
e-mail: muellerm@princeton.edu
Klaus Peter Geigle
Mem. ASME
German Aerospace Center (DLR),
Institution of Combustion Technology,
Pfaffenwaldring 38-40,
Stuttgart D-70569, Germany
e-mail: klauspeter.geigle@dlr.de
German Aerospace Center (DLR),
Institution of Combustion Technology,
Pfaffenwaldring 38-40,
Stuttgart D-70569, Germany
e-mail: klauspeter.geigle@dlr.de
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 26, 2016; final manuscript received July 10, 2016; published online September 27, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Mar 2017, 139(3): 031503 (9 pages)
Published Online: September 27, 2016
Article history
Received:
June 26, 2016
Revised:
July 10, 2016
Citation
Koo, H., Hassanaly, M., Raman, V., Mueller, M. E., and Peter Geigle, K. (September 27, 2016). "Large-Eddy Simulation of Soot Formation in a Model Gas Turbine Combustor." ASME. J. Eng. Gas Turbines Power. March 2017; 139(3): 031503. https://doi.org/10.1115/1.4034448
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