Flame area fluctuation measurements in velocity-forced premixed gas turbine flames

Alexander J. De Rosa, Janith Samarasinghe, Stephen J. Peluso, Bryan D. Quay, Domenic A. Santavicca

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

    2 Scopus citations

    Abstract

    Fluctuations in the heat release rate that occur during unstable combustion in lean premixed gas turbine combustors can be attributed to velocity and equivalence ratio fluctuations. For a fully premixed flame, velocity fluctuations affect the heat release rate primarily by inducing changes in the flame area. In this paper, a technique to analyze changes in flame area using chemiluminescence-based flame images is presented. The technique decomposes the flame area into separate components which characterize the relative contributions of area fluctuations in the large scale structure and the small scale wrinkling of the flame. The fluctuation in the wrinkled area of the flame which forms the flame brush is seen to dominate its response in the majority of cases tested. Analysis of the flame area associated with the large scale structure of the flame resolves convective perturbations that move along the mean flame position. Results are presented that demonstrate the application of this technique to both single-nozzle and multinozzle flames.

    Original languageEnglish (US)
    Title of host publicationCombustion, Fuels and Emissions
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Electronic)9780791856680, 9780791856680
    DOIs
    StatePublished - 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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