Comparison of equivalence ratio transients on combustion instability in single-nozzle and multi-nozzle combustors

Xiaoling Chen, Wyatt Culler, Stephen J. Peluso, Domenic Santavicca, Jacqueline Antonia O'Connor

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

    Abstract

    Low-emissions gas turbine combustion, achieved through the use of lean, premixed fueling strategies, is susceptible to combustion instability. The driving mechanism for this instability arises from fluctuations of pressure, fuel/air flow rate, and heat release rate. If these fluctuations are relatively in-phase, the combustion system will evolve to a self-excited state. The self-excited instability frequency and amplitude depend mainly on the operating condition and the geometry of the combustor. In this study, we consider the onset and decay of self-excited instabilities, resulting from transients in fuel/air ratio, in both single-nozzle and multi-nozzle combustors. In particular, we examine the differences in the instability onset and decay processes between these two flame configurations, as most gas turbine combustors have multiple nozzles, but most gas turbine combustor experiments utilize a single-nozzle. A nonlinear logistic regression analysis is applied to study the timescales of the decay and onset transients. Variations in the equivalence ratio change the heat release rate distribution inside the combustor, which is captured using chemiluminescence imaging. The normalized Rayleigh index, which shows the spatial distribution of the instability driving, is calculated to analyze the driving strength in different regions of the flame. Comparisons between the single- and multi-nozzle flame transients, including both center and outer flames for the multi-nozzle combustor, suggest that both confinement from the wall and flame-flame interaction are crucial to determining flame dynamics as the equivalence ratio transient changes the heat release rate distribution near corner recirculation zone and flame shear layers.

    Original languageEnglish (US)
    Title of host publicationCombustion, Fuels, and Emissions
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)9780791851050
    DOIs
    StatePublished - Jan 1 2018
    EventASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway
    Duration: Jun 11 2018Jun 15 2018

    Publication series

    NameProceedings of the ASME Turbo Expo
    Volume4A-2018

    Other

    OtherASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
    CountryNorway
    CityOslo
    Period6/11/186/15/18

    Fingerprint

    Combustors
    Nozzles
    Gas turbines
    Fueling
    Chemiluminescence
    Air
    Excited states
    Regression analysis
    Spatial distribution
    Logistics
    Flow rate
    Imaging techniques
    Geometry
    Hot Temperature
    Experiments

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Chen, X., Culler, W., Peluso, S. J., Santavicca, D., & O'Connor, J. A. (2018). Comparison of equivalence ratio transients on combustion instability in single-nozzle and multi-nozzle combustors. In Combustion, Fuels, and Emissions (Proceedings of the ASME Turbo Expo; Vol. 4A-2018). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT201875427
    Chen, Xiaoling ; Culler, Wyatt ; Peluso, Stephen J. ; Santavicca, Domenic ; O'Connor, Jacqueline Antonia. / Comparison of equivalence ratio transients on combustion instability in single-nozzle and multi-nozzle combustors. Combustion, Fuels, and Emissions. American Society of Mechanical Engineers (ASME), 2018. (Proceedings of the ASME Turbo Expo).
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    abstract = "Low-emissions gas turbine combustion, achieved through the use of lean, premixed fueling strategies, is susceptible to combustion instability. The driving mechanism for this instability arises from fluctuations of pressure, fuel/air flow rate, and heat release rate. If these fluctuations are relatively in-phase, the combustion system will evolve to a self-excited state. The self-excited instability frequency and amplitude depend mainly on the operating condition and the geometry of the combustor. In this study, we consider the onset and decay of self-excited instabilities, resulting from transients in fuel/air ratio, in both single-nozzle and multi-nozzle combustors. In particular, we examine the differences in the instability onset and decay processes between these two flame configurations, as most gas turbine combustors have multiple nozzles, but most gas turbine combustor experiments utilize a single-nozzle. A nonlinear logistic regression analysis is applied to study the timescales of the decay and onset transients. Variations in the equivalence ratio change the heat release rate distribution inside the combustor, which is captured using chemiluminescence imaging. The normalized Rayleigh index, which shows the spatial distribution of the instability driving, is calculated to analyze the driving strength in different regions of the flame. Comparisons between the single- and multi-nozzle flame transients, including both center and outer flames for the multi-nozzle combustor, suggest that both confinement from the wall and flame-flame interaction are crucial to determining flame dynamics as the equivalence ratio transient changes the heat release rate distribution near corner recirculation zone and flame shear layers.",
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    Chen, X, Culler, W, Peluso, SJ, Santavicca, D & O'Connor, JA 2018, Comparison of equivalence ratio transients on combustion instability in single-nozzle and multi-nozzle combustors. in Combustion, Fuels, and Emissions. Proceedings of the ASME Turbo Expo, vol. 4A-2018, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, Oslo, Norway, 6/11/18. https://doi.org/10.1115/GT201875427

    Comparison of equivalence ratio transients on combustion instability in single-nozzle and multi-nozzle combustors. / Chen, Xiaoling; Culler, Wyatt; Peluso, Stephen J.; Santavicca, Domenic; O'Connor, Jacqueline Antonia.

    Combustion, Fuels, and Emissions. American Society of Mechanical Engineers (ASME), 2018. (Proceedings of the ASME Turbo Expo; Vol. 4A-2018).

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

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    Chen X, Culler W, Peluso SJ, Santavicca D, O'Connor JA. Comparison of equivalence ratio transients on combustion instability in single-nozzle and multi-nozzle combustors. In Combustion, Fuels, and Emissions. American Society of Mechanical Engineers (ASME). 2018. (Proceedings of the ASME Turbo Expo). https://doi.org/10.1115/GT201875427