Results 51 to 60 of about 3,434 (176)
An analytical model for azimuthal thermoacoustic modes in an annular chamber fed by an annular plenum [PDF]
, 2014 This study describes an analytical method for computing azimuthal modes due to flame/acoustics coupling in annular combustors. It is based on a quasi-one-dimensional zero-Mach-number formulation where N burners are connected to an upstream annular plenum
Bauerheim, Michaël +4 more
core +4 more sources
Fokker–Planck modeling of the stochastic dynamics of a Rijke tube
Chaos: An Interdisciplinary Journal of Nonlinear ScienceWe derive and numerically validate a low-order oscillator model to capture the stochastic dynamics of a prototypical thermoacoustic system (a Rijke tube) undergoing a subcritical Hopf bifurcation in the presence of additive noise. We find that on the fixed-point branch before the bifurcation, the system is dominated by the first duct mode, and the ...
Minwoo Lee +2 more
openaire +3 more sources
Learning and Characterizing Chaotic Attractors of a Lean Premixed Combustor
EnergiesThis paper is about the characteristics of and a method to recognize the onset of limit cycle thermoacoustic oscillations in a gas turbine-like combustor with a premixed turbulent methane/air flame.
Sara Navarro-Arredondo, Jim B. W. Kok
doaj +1 more source
, 2018 Acoustic dampers are efficient and cost-effective means for suppressing thermoacoustic instabilities in combustion chambers. However, their design and the choice of their purging air mass flow is a challenging task, when one aims at ensuring ...
Bourquard, Claire, Noiray, Nicolas
core +1 more source
Control of weak perturbations [PDF]
, 2012 Session 4aHT - Hot Topics: Aeroacoustics I: abstract 4aHT8Starting from p. 3207 of this journal issue is proceedings of ACOUSTICS 2012 HONG KONGWe define sound as being a weak perturbation in the properties of material consistent with the Navier-Stokes ...
Ffowcs Williams, JE, Huang, L
core +1 more source
Passive suppression of thermoacoustic instability in a Rijke tube
IFAC-PapersOnLine, 2016 Abstract This article investigates passive stabilization of thermoacoustic dynamics in a Rijke tube by using a Helmholtz resonator. Under certain assumptions, the mathematical model of the dynamics is shown to fall into the linear time-invariant multiple time delay systems class of neutral type.
Umut Zalluhoglu, Nejat Olgac
openaire +1 more source
Fluid-structure interaction on the combustion instability [PDF]
, 2012 The multi-domain problem, the limit cycle behaviour of unstable oscillations in the LIMOUSINE model combustor has been investigated by numerical and experimental studies.
Altunlu, A.C. +5 more
core +1 more source
Progress in analytical methods to predict and control azimuthal combustion instability modes in annular chambers [PDF]
, 2016 Longitudinal low-frequency thermoacoustic unstable modes in combustion chambers have been intensively studied experimentally, numerically, and theoretically, leading to significant progress in both understanding and controlling these acoustic modes ...
Bauerheim, Michaël +2 more
core +3 more sources
A projektmunka hatásai a természettudományos tantárgyak tanulásában [PDF]
, 2011 A természettudományok oktatása csak akkor lehet sikeres, ha képesek leszünk választ adni a 21. század kihívásaira. A hagyományos elven oktatott természettudományos tantárgyak a legtöbb gyermek számára érthetetlen és felesleges nyűgnek számítanak.
Beke, Tamás
core +1 more source
Nonlinear self-excited thermoacoustic oscillations of a ducted premixed flame: Bifurcations and routes to chaos [PDF]
, 2014 Thermoacoustic systems can oscillate self-excitedly, and often non-periodically, owing to coupling between unsteady heat release and acoustic waves. We study a slot-stabilized two-dimensional premixed flame in a duct via numerical simulations of a $G ...
Juniper, MP, Kashinath, K, Waugh, IC
core +1 more source