An experimental study on the coupling of combustion instability mechanisms in a lean premixed gas turbine combustor

Hyung Ju Lee, Kyu Tae Kim, Jong Guen Lee, Bryan D. Quay, Domenic A. Santavicca

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

    13 Scopus citations


    An experimental study was conducted to characterize the combined effects of flame-vortex interactions and equivalence ratio fluctuations on self-excited combustion instabilities in a swirl-stabilized lean premixed gas turbine combustor. The combustor was designed so that the fuel injector location and the combustion chamber length could be independently varied. In addition, the fuel and air could be mixed upstream of the choked inlet to the combustor, thereby eliminating the possibility of equivalence ratio fluctuations. Experiments were performed over a broad range of operating conditions and at each condition both the combustor length and the fuel injection location were varied. Dynamic pressure in the combustor, acoustic pressure and velocity in the mixing section, and the overall rate of heat release were simultaneously measured at all operating conditions. Two distinct instability regimes were observed; one near 220 Hz and the other near 345 Hz. It was also found that the strength of the instability changed significantly as the fuel injection location was varied, while the phase of the acoustic pressure and velocity fluctuations in the mixing section did not change. A time series of pressure and CH* chemiluminescence signals confirmed constructive or destructive coupling of the two instability mechanisms; the flame-vortex interaction and the equivalence ratio fluctuation interact each other and determine the instability characteristics in partially premixed conditions.

    Original languageEnglish (US)
    Title of host publicationProceedings of the ASME Turbo Expo 2009
    Subtitle of host publicationPower for Land, Sea and Air
    Number of pages10
    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


    Other2009 ASME Turbo Expo
    Country/TerritoryUnited States
    CityOrlando, FL

    All Science Journal Classification (ASJC) codes

    • General Engineering


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