title: Coherence resonance in a thermoacoustic system.
abstract: We experimentally investigated the noise-induced dynamics of a prototypical thermoacoustic system undergoing a subcritical Hopf bifurcation to limit cycle oscillations. The study was performed prior to the bistable regime. Analysis of the characteristics of pressure oscillations in the combustor and fluctuations in the heat release rate from the flame-the two physical entities involved in thermoacoustic coupling-at increasing levels of noise indicated precursors to the Hopf bifurcation. These precursors were further identified to be a result of coherence resonance.
authors.affiliation: Chair of Fluid Dynamics, Hermann-Föttinger-Institut (HFI), Technische Universität Berlin, D-10623 Berlin, Germany.
authors.forename: Lipika
authors.initials: L
authors.lastname: Kabiraj
authors.affiliation: Chair of Fluid Dynamics, Hermann-Föttinger-Institut (HFI), Technische Universität Berlin, D-10623 Berlin, Germany.
authors.forename: Richard
authors.initials: R
authors.lastname: Steinert
authors.affiliation: Chair of Fluid Dynamics, Hermann-Föttinger-Institut (HFI), Technische Universität Berlin, D-10623 Berlin, Germany.
authors.forename: Aditya
authors.initials: A
authors.lastname: Saurabh
authors.affiliation: Chair of Fluid Dynamics, Hermann-Föttinger-Institut (HFI), Technische Universität Berlin, D-10623 Berlin, Germany.
authors.forename: Christian Oliver
authors.initials: CO
authors.lastname: Paschereit