Response of partially premixed flames to acoustic velocity and equivalence ratio perturbations

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This article describes an experimental investigation of the forced response of a swirl-stabilized partially premixed flame when it is subjected to acoustic velocity and equivalence ratio fluctuations. The flame's response is analyzed using phase-resolved CH(+) chemiluminescence images and flame transfer function (FTF) measurements, and compared with the response of a perfectly premixed flame under acoustic perturbations. The nonlinear response of the partially premixed flame is manifested by a partial extinction of the reaction zone, leading to rapid reduction of flame surface area. This nonlinearity, however, is observed only when the phase difference between the acoustic velocity and the equivalence ratio at the combustor inlet is close to zero. The condition, Delta phi(phi') (v') approximate to 0 degrees, indicates that reactant mixtures with high equivalence ratio impinge on the flame front with high velocity, inducing large fluctuations of the rate of heat release. It is found that the phase difference between the acoustic velocity and equivalence ratio nonuniformities is a key parameter governing the linear/nonlinear response of a partially premixed flame, and it is a function of modulation frequency, inlet velocity, fuel injection location, and fuel injector impedance. The results presented in this article will provide insight into the response of a partially premixed flame, which has not been well explored to date.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2010-09
Language
English
Article Type
Article
Keywords

COMBUSTION DYNAMICS; NONLINEAR RESPONSE; HEAT RELEASE; OSCILLATIONS; INSTABILITY; CHEMILUMINESCENCE; MECHANISMS; PRESSURE; MODEL; FLOW

Citation

COMBUSTION AND FLAME, v.157, no.9, pp.1731 - 1744

ISSN
0010-2180
DOI
10.1016/j.combustflame.2010.04.006
URI
http://hdl.handle.net/10203/207575
Appears in Collection
AE-Journal Papers(저널논문)
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