Spatially distributed flame transfer functions for predicting combustion dynamics in lean premixed gas turbine combustors

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The present paper describes a methodology to improve the accuracy of prediction of the eigenfrequencies and growth rates of self-induced instabilities and demonstrates its application to a laboratory-scale, swirl-stabilized, lean-premixed, gas turbine combustor. The influence of the spatial heat release distribution is accounted for using local flame transfer function (FTF) measurements. The two-microphone technique and CH. chemiluminescence intensity measurements are used to determine the input (inlet velocity perturbation) and the output functions (heat release oscillation), respectively, for the local flame transfer functions. The experimentally determined local flame transfer functions are superposed using the flame transfer function superposition principle, and the result is incorporated into an analytic thermoacoustic model, in order to predict the linear stability characteristics of a given system. Results show that when the flame length is not acoustically compact the model prediction calculated using the local flame transfer functions is better than the prediction made using the global flame transfer function. In the case of a flame in the compact flame regime, accurate predictions of eigenfrequencies and growth rates can be obtained using the global flame transfer function. It was also found that the general response characteristics of the local FTF (gain and phase) are qualitatively the same as those of the global FTF.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2010-09
Language
English
Article Type
Article
Keywords

INLET VELOCITY OSCILLATIONS; LARGE-EDDY SIMULATION; NONLINEAR RESPONSE; HEAT RELEASE; INSTABILITY ANALYSIS; MODEL; NONUNIFORMITIES; MECHANISM; WAVES; FLOW

Citation

COMBUSTION AND FLAME, v.157, no.9, pp.1718 - 1730

ISSN
0010-2180
DOI
10.1016/j.combustflame.2010.04.016
URI
http://hdl.handle.net/10203/207574
Appears in Collection
AE-Journal Papers(저널논문)
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