Experimental investigation of the nonlinear response of swirl stabilized flames to equivalence ratio oscillations

Kyu Tae Kim, Jong Guen Lee, Bryan David Quay, Domenic A. Santavicca

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

    6 Scopus citations

    Abstract

    The nonlinear response of a swirl-stabilized flame to equivalence ratio oscillations was experimentally investigated in an atmospheric-pressure, high-temperature, lean-premixed model gas turbine combustor. To generate high-amplitude equivalence ratio oscillations, fuel was modulated using a siren type modulating device. The mixture ratio oscillations at the inlet of the combustion chamber were measured by the infrared absorption technique and the flame's response, i.e., the fluctuation in the flame's rate of heat release, was estimated by CH chemiluminescence emission intensity. Phase-resolved CH chemiluminescence images were taken to characterize the dynamic response of the flame. Results show that the amplitude and frequency dependence of the flame's response to equivalence ratio oscillations is qualitatively consistent with the flame's response to inlet velocity oscillations. The underlying physics of the nonlinear response of the flame to equivalence ratio oscillations, however, is associated with the intrinsically nonlinear dependence of the heat of reaction and burning velocity on the equivalence ratio. It was found that combustion cannot be sustained under conditions of high amplitude equivalence ratio oscillations. Lean blowoff occurs when the normalized amplitude of the equivalence ratio oscillation exceeds a threshold value. The threshold value is dependent on the mean equivalence ratio and modulation frequency.

    Original languageEnglish (US)
    Title of host publicationASME Turbo Expo 2010
    Subtitle of host publicationPower for Land, Sea, and Air, GT 2010
    Pages833-842
    Number of pages10
    EditionPARTS A AND B
    DOIs
    StatePublished - Dec 1 2010
    EventASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 - Glasgow, United Kingdom
    Duration: Jun 14 2010Jun 18 2010

    Publication series

    NameProceedings of the ASME Turbo Expo
    NumberPARTS A AND B
    Volume2

    Other

    OtherASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010
    CountryUnited Kingdom
    CityGlasgow
    Period6/14/106/18/10

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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  • Cite this

    Kim, K. T., Lee, J. G., Quay, B. D., & Santavicca, D. A. (2010). Experimental investigation of the nonlinear response of swirl stabilized flames to equivalence ratio oscillations. In ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 (PARTS A AND B ed., pp. 833-842). (Proceedings of the ASME Turbo Expo; Vol. 2, No. PARTS A AND B). https://doi.org/10.1115/GT2010-23023