RECONSTRUCTION OF HEAT RELEASE RESPONSE OF PARTIALLY PREMIXED FLAMES

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The forced response of a swirl-stabilized, partially premixed flame to inlet velocity and equivalence ratio oscillations was experimentally investigated in a model lean premixed gas turbine combustor. The responses of a premixed flame to three different forcing mechanisms were studied: velocity oscillations, equivalence ratio oscillations, and the combination of velocity and equivalence ratio oscillations. The overall heat release response of the flame was determined from measurements of the CH* chemiluminescence emission intensity from the entire flame, while the response of the spatially distributed heat release was determined from phase-synchronized chemiluminescence images. In addition, simultaneous measurements were made of the inlet velocity and equivalence ratio oscillations using the 2-microphone method and an IR absorption technique, respectively. The results show that in the linear regime, the response of a partially premixed flame to simultaneous velocity and equivalence ratio oscillations can be reconstructed from independent measurements of the flame's response to velocity oscillations and to equivalence ratio oscillations using a vector summation method. This is the first experimental demonstration of a 2-input 1-output model of a swirl-stabilized partially premixed flame. It suggests that the response of a partially premixed flame is governed by four physical parameters (i.e., the oscillation frequency, the amplitude of velocity oscillation, the amplitude of equivalence ratio oscillation, and the phase difference between the two oscillations). As a result, the heat release response of a partially premixed flame can be amplified or damped, depending on the phase difference between the velocity and equivalence ratio oscillations at the combustor inlet.
Publisher
TAYLOR FRANCIS INC
Issue Date
2011-02
Language
English
Article Type
Article
Keywords

INLET VELOCITY OSCILLATIONS; COMBUSTION INSTABILITY; NUMERICAL-SIMULATION; NONLINEAR RESPONSE; SWIRL FLAME; DYNAMICS; MODEL

Citation

COMBUSTION SCIENCE AND TECHNOLOGY, v.183, no.2, pp.122 - 137

ISSN
0010-2202
DOI
10.1080/00102202.2010.503205
URI
http://hdl.handle.net/10203/207571
Appears in Collection
AE-Journal Papers(저널논문)
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