Comparison of center nozzle staging to outer nozzle staging in a multi-flame combustor

Wyatt Culler, Xiaoling Chen, Stephen Peluso, Domenic Santavicca, Jacqueline O'Connor, David Noble

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

4 Scopus citations

Abstract

Combustion instability in gas turbines is often mitigated using fuel staging, a strategy where the fuel is split unevenly between different nozzles of a multiple-nozzle combustor. This work examines the efficacy of different fuel staging configurations by comparing axisymmetric and non-axisymmetric fuel staging in a four-around-one model gas turbine combustor. Fuel staging is accomplished by increasing the equivalence ratio of the center nozzle (axisymmetric staging) or an outer nozzle (non-axisymmetric staging). When the global equivalence ratio is φ = 0.70 and all nozzles are fueled equally, the combustor undergoes longitudinal, self-excited oscillations. These oscillations are suppressed when the center nozzle equivalence ratio is increased above φStaging = 0.79. This bifurcation equivalence ratio varies between φStaging = 0.86 and φStaging = 0.76 for the outer nozzles, and is attributed to minor hardware differences between each nozzle. High speed CH* chemiluminescence images in combination with dynamic pressure measurements are used to determine the instantaneous phase difference between the heat release rate fluctuation and the combustor pressure fluctuation throughout the combustor. This analysis shows that the staged flame has similar phase relationships for all staging configurations. It is found that axisymmetric staging can be as effective as non-axisymmetric staging; however, the aforementioned hardware variations can impact both the bifurcation equivalence ratio and the effectiveness of staging.

Original languageEnglish (US)
Title of host publicationCombustion, Fuels, and Emissions
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)9780791851050
DOIs
StatePublished - 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

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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