The effect of confinement on the structure and dynamic response of lean-premixed, swirl-stabilized flames

Alexander J. De Rosa, Stephen J. Peluso, Bryan David Quay, Domenic A. Santavicca

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    4 Scopus citations

    Abstract

    The effect of flame-wall interaction on the forced response of a lean-premixed, swirl-stabilized flame is experimentally investigated by examining flames in a series of three combustors, each with a different diameter and therefore a different degree of lateral confinement. The confinement ratios tested are 0.5, 0.37 and 0.29 when calculated using the diameter of the nozzle relative to the combustor diameter. Using both flame images and measured flame transfer functions, the effect of confinement is investigated and generalized across a broad range of operating conditions. The major effect of confinement is shown to be a change in flame structure in both the forced and unforced cases. This effect is captured using the parameter Lf,CoHR/Dcomb, which describes the changing degree of flame-wall interaction in each combustor size. The measured flame transfer function data, as a function of confinement, is then generalized by Strouhal number. Data from the two larger combustors is collapsed by multiplying the Strouhal number by the confinement ratio to account for the flow expansion ratio and change in convective velocity within the combustor. Trends at the transfer function extrema are also assessed by examining them in the context of confinement and by using flame images. A change in the fluctuating structure of the flame is also seen to result from an increase in confinement.

    Original languageEnglish (US)
    Title of host publicationCombustion, Fuels and Emissions
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Electronic)9780791856680, 9780791856680
    DOIs
    StatePublished - Jan 1 2015
    EventASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015 - Montreal, Canada
    Duration: Jun 15 2015Jun 19 2015

    Publication series

    NameProceedings of the ASME Turbo Expo
    Volume4A

    Other

    OtherASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015
    CountryCanada
    CityMontreal
    Period6/15/156/19/15

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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  • Cite this

    De Rosa, A. J., Peluso, S. J., Quay, B. D., & Santavicca, D. A. (2015). The effect of confinement on the structure and dynamic response of lean-premixed, swirl-stabilized flames. In Combustion, Fuels and Emissions (Proceedings of the ASME Turbo Expo; Vol. 4A). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2015-42178