Characterization of forced flame response of swirl-stabilized turbulent lean-premixed flames in a gas turbine combustor

Kyu Tae Kim, Jong Guen Lee, Hyung Ju Lee, Bryan David Quay, Domenic Santavicca

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

    10 Scopus citations

    Abstract

    Flame transfer function measurements of turbulent premixed flames were made in a model lean premixed, swirl-stabilized, gas turbine combustor. OH*, CH*, and CO2* chemiluminescence emissions were measured to determine heat release oscillation from a whole flame, and the two-microphone technique was used to measure inlet velocity fluctuation. 2-D CH* chemiluminescence imaging was used to characterize the flame shape: the flame length (LCH* max) and flame angle (α). Using H 2-natural gas composite fuels, XH2 = 0.00-0.60, very short flame was obtained and hydrogen enrichment of natural gas had a significant impact on the flame structure and flame attachment points. For a pure natural gas flame, the flames exhibit a "V" structure, whereas H 2-enriched natural gas flames have an "M" structure. Results show that the gain of "M" flames is much smaller than that of "V" flames. Similar to results of analytic and experimental investigations on the flame transfer function of laminar premixed flames, it shows that the dynamics of a turbulent premixed flame is governed by three relevant parameters: the Strouhal number (St = LCH* max / LCONV), the flame length (LCH*max), and the flame angle (a). Two flames with the same flame shape exhibit very similar forced responses, regardless of their inlet flow conditions. This is significant because the forced flame response of a highly turbulent, practical gas turbine combustor can be quantitatively generalized using the non-dimensional parameters which collapse all relevant input conditions into the flame shape and the Strouhal number.

    Original languageEnglish (US)
    Title of host publicationProceedings of the ASME Turbo Expo 2009
    Subtitle of host publicationPower for Land, Sea and Air
    Pages823-831
    Number of pages9
    DOIs
    StatePublished - Dec 1 2009
    Event2009 ASME Turbo Expo - Orlando, FL, United States
    Duration: Jun 8 2009Jun 12 2009

    Publication series

    NameProceedings of the ASME Turbo Expo
    Volume2

    Other

    Other2009 ASME Turbo Expo
    CountryUnited States
    CityOrlando, FL
    Period6/8/096/12/09

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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