Experimental investigation of the unsteady response of premixed flame fronts to acoustic pressure waves

Journal Article · Tue Jul 15 04:00:00 EDT 2008 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2008.03.002· OSTI ID:21044889

Wangher, Athena; Searby, Geoff; Quinard, Joel ^[1]

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1. CNRS and Aix-Marseille Universite, Institut de Recherche sur les Phenomenes Hors Equilibre, 49 rue Frederic Joliot-Curie, F-13384 Marseille cedex 13 (France)

Using OH{sup *} chemiluminescence, we measure the experimental unsteady response of a 1-D premixed flame to an acoustic pressure wave for a range of frequencies below and above the inverse of the flame transit time. We find that the response is positive and, at low frequency, the order of magnitude is comparable with existing theoretical analyses. However, if it is assumed that the chemiluminescence is proportional to the mass consumption rate, despite some uncertainty in the interpretation of the chemiluminescence signal we find that the frequency dependence of the measured response is not compatible with the predictions of the standard flame model for one-step Arrhenius kinetics. A better, but not perfect, correlation is obtained for the heat release rate. We conclude that the standard model does not provide an adequate description of the unsteady response of real flames and that it is necessary to investigate more realistic chemical models. (author)

• OSTI ID: 21044889
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1-2 Vol. 154; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ACCURACY
Acoustic-flame interaction
COMBUSTION INSTABILITY
COMBUSTION KINETICS
CONSUMPTION RATES
CORRELATIONS
Combustion instabilities
FLAMES
FREQUENCY DEPENDENCE
HEAT
MATHEMATICAL MODELS
SOUND WAVES