Stability limits and non-linear characteristics of a self-excited combustion instability

Roel A.J. Müller, Jakob Hermann, Wolfgang Polifke

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Self-excited combustion instabilities of a bluff-body-stabilized premixed flame are investigated. The burner is situated in a duct of rectangular cross-section with closed/open acoustic boundary conditions, representing a quarter-wave acoustic resonator. Fuel gas (methane) is injected through small holes a short distance upstream of the flame, such that it burns in partially premixed mode. Operating points (i.e. thermal power and equivalence ratio) where instability occurs are identified. Variation of amplitude and frequency while operating conditions are changed are discussed for the dominant mode of oscillation, as well as its second and third harmonic. For certain operating points, the harmonics of the first mode seem to couple with higher independent modes. Pressure oscillations during limit cycle operation for one constant operating point are measured along the combustor length. The shape and amplitude of several independent thermo-acoustic modes, as well as the most significant higher harmonics, are reconstructed, identified and interpreted in relation to the combustor geometry. The phase shift between pressure variation at the flame and heat release (Rayleigh index) is discussed for the independent modes, as well as the higher harmonics.

Original languageEnglish
Title of host publication19th International Congress on Sound and Vibration 2012, ICSV 2012
Pages514-521
Number of pages8
StatePublished - 2012
Event19th International Congress on Sound and Vibration 2012, ICSV 2012 - Vilnius, Lithuania
Duration: 8 Jul 201212 Jul 2012

Publication series

Name19th International Congress on Sound and Vibration 2012, ICSV 2012
Volume1

Conference

Conference19th International Congress on Sound and Vibration 2012, ICSV 2012
Country/TerritoryLithuania
CityVilnius
Period8/07/1212/07/12

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