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

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 (nonaxisymmetric staging). When the global equivalence ratio is f = 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 fStaging =0:79. This bifurcation equivalence ratio varies between fStaging = 0:86 and fStaging = 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 nonaxisymmetric staging; however, the aforementioned hardware Addressmore » all correspondence to jxo22@psu.edu variations can impact both the bifurcation equivalence ratio and the effectiveness of staging.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1462986
DOE Contract Number:  
FE0025495
Resource Type:
Conference
Resource Relation:
Conference: ASME Turbo Expo 2018, Oslo, Norway
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 20 FOSSIL-FUELED POWER PLANTS

Citation Formats

Culler, Wyatt, Chen, Xiaoling, Peluso, Stephen, Santavicca, Domenic, and O'Connor, Jacqueline. Comparison of center nozzle staging to outer nozzle staging in a multi-flame combustor. United States: N. p., 2018. Web.
Culler, Wyatt, Chen, Xiaoling, Peluso, Stephen, Santavicca, Domenic, & O'Connor, Jacqueline. Comparison of center nozzle staging to outer nozzle staging in a multi-flame combustor. United States.
Culler, Wyatt, Chen, Xiaoling, Peluso, Stephen, Santavicca, Domenic, and O'Connor, Jacqueline. Mon . "Comparison of center nozzle staging to outer nozzle staging in a multi-flame combustor". United States.
@article{osti_1462986,
title = {Comparison of center nozzle staging to outer nozzle staging in a multi-flame combustor},
author = {Culler, Wyatt and Chen, Xiaoling and Peluso, Stephen and Santavicca, Domenic and O'Connor, Jacqueline},
abstractNote = {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 (nonaxisymmetric staging). When the global equivalence ratio is f = 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 fStaging =0:79. This bifurcation equivalence ratio varies between fStaging = 0:86 and fStaging = 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 nonaxisymmetric staging; however, the aforementioned hardware Address all correspondence to jxo22@psu.edu variations can impact both the bifurcation equivalence ratio and the effectiveness of staging.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {6}
}

Conference:
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