Results 81 to 90 of about 2,929 (210)
Continuous and explosive synchronization transition in turbulent combustors
AIP AdvancesThermoacoustic instabilities in turbulent combustors have disastrous consequences and present notorious challenges in their modeling, prediction, and control.
Samarjeet Singh +4 more
doaj +1 more source
Mixed acoustic–entropy combustion instabilities in gas turbines [PDF]
, 2014 A combustion instability in a combustor terminated by a nozzle is analysed and modelled based on a low-order Helmholtz solver. A large eddy simulation (LES) of the corresponding turbulent, compressible and reacting flow is first performed and analysed ...
Motheau, Emmanuel +2 more
core +3 more sources
Nonlinear hydrodynamic and thermoacoustic oscillations of a bluff-body stabilised turbulent premixed flame [PDF]
, 2016 Turbulent premixed flames often experience thermoacoustic instabilities when the combustion heat release rate is in phase with acoustic pressure fluctuations.
Cant, RS, Juniper, MP, Lee, CY, Li, LKB
core +3 more sources
AerospaceThis paper investigates the role of chaotic analysis and deep learning models in combustion instability predictions. To detect the precursors of impending thermoacoustic instability (TAI) in a swirled combustor with various fuel injection strategies, a ...
Boqi Xu +6 more
doaj +1 more source
Full field inversion in photoacoustic tomography with variable sound speed
, 2018 Recently, a novel measurement setup has been introduced to photoacoustic tomography, that collects data in the form of projections of the full 3D acoustic pressure distribution at a certain time instant.
Haltmeier, Markus +3 more
core +1 more source
Bistability and Triggering Analysis of Thermoacoustic Instability in a Horizontal Rijke Tube
Xibei Gongye Daxue Xuebao, 2019 Dynamical systems theory has been often employed to study nonlinear flow and flame dynamics in combustion systems. However, the corresponding studies using nonlinear dynamics to analyze the Rijke tube thermoacoustic system are still occasional.
doaj +1 more source
Quantitative Photoacoustic Imaging in the Acoustic Regime using SPIM
, 2017 While in standard photoacoustic imaging the propagation of sound waves is modeled by the standard wave equation, our approach is based on a generalized wave equation with variable sound speed and material density, respectively.
Beigl, Alexander +3 more
core +1 more source
EnergiesIn combustor systems, thermoacoustic instabilities may occur and must be avoided for reliable operation. An acoustic network model can be used to predict the eigenfrequencies of the instabilities and the growth rate by incorporating the combustion ...
Mehmet Kapucu +2 more
doaj +1 more source
MODELING AND ACTIVE CONTROL OF THERMOACOUSTIC INSTABILITIES
IFAC Proceedings Volumes, 2005 Abstract Due to stringent emission regulations, modern gas turbines work in lean premixed mode and thermoacoustic instabilities are often observed. They cause mechanical damage and therefore have to be reduced. This paper describes the development of an acoustic network model for a lab-scale lean premixed methane combustor at ETH Zurich. The model is
André S.P. Niederberger +2 more
openaire +1 more source
Universality of oscillatory instabilities in fluid mechanical systems
New Journal of PhysicsOscillatory instability emerges amidst turbulent states in experiments in various turbulent fluid and thermo-fluid systems such as aero-acoustic, thermoacoustic and aeroelastic systems. For the time series of the relevant dynamic variable at the onset of
Vladimir García-Morales +3 more
doaj +1 more source