Results 91 to 100 of about 787,947 (227)

Weakly nonlinear analysis of thermoacoustic bifurcations in the Rijke tube [PDF]

, 2016
In this study we present a theoretical weakly nonlinear framework for the prediction of thermoacoustic oscillations close to Hopf bifurcations. We demonstrate the method for a thermoacoustic network that describes the dynamics of an electrically heated ...
Juniper, MP, Orchini, A, Rigas, G
core   +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, Bruno B.H. Schuermans, Lino Guzzella   +2 more
openaire   +1 more source

UV and Visible Radiation Characteristics of Thermoacoustic Instabilities in an Ammonia–Methane Premixed Swirl-Stabilized Combustor

Energies
Ammonia (NH3) is a promising carbon-free energy carrier for low-carbon power generation. However, in turbulent ammonia–methane (NH3-CH4) premixed swirling flames, operating at lean conditions to limit NOX, emissions can trigger strong thermoacoustic ...
Junhui Ma, Xianglan Fu, Dongqi Chen, Le Chang, Lingxue Wang, Yingchen Shi, Haocheng Wen, Bing Wang   +7 more
doaj   +1 more source

Time Series and Spectral Analysis of Thermoacoustic Oscillations for Propane-Oxyfuel Combustion in a Swirl-Stabilized, Nonpremixed Combustor. [PDF]

ACS Omega, 2023
Talal Q, Abubakar Z, Shakeel MR, AlSwat MS, Mokheimer EMA.   +4 more
europepmc   +1 more source

Vibration of the liner in an industrial combustion system due to an acoustic field [PDF]

, 2003
The subject of this paper is a numerical study of the properties of the liner of a test rig to be built in the future. The test-rig consists of a flexible tube of square crosssection surrounded by a pressure vessel, also with a square cross-section.
Boer, André de, Huls, Rob A., Kok, Jim B.W.   +2 more
core   +2 more sources

Thermal and fluid dynamic analysis of partially premixed turbulent combustion driven by thermo acoustic effects [PDF]

, 2013
Thermo-acoustic instability can be caused by the feedback mechanism between unsteady heat release, acoustic oscillations and flow perturbations. In a gas turbine combustor limit cycles of pressure oscillations at elevated temperatures generated by the ...
Kok, J.B.W., Pozarlik, A.K., Shahi, M., Sponfeldner, Thomas   +3 more
core   +1 more source

A mathematical model and inversion procedure for Magneto-Acousto-Electric Tomography (MAET)

, 2011
Magneto-Acousto-Electric Tomography (MAET), also known as the Lorentz force or Hall effect tomography, is a novel hybrid modality designed to be a high-resolution alternative to the unstable Electrical Impedance Tomography.
Agranovsky M, Ambartsoumian G Patch S Oraevsky A A Wang L V, Barber D C, Borcea L, Colton D, Gilbarg D, Haider S, Hristova Y, Kuchment P, Kunyansky L, Kunyansky L, Kunyansky L, Kunyansky L, Kunyansky L Kuchment P, Leonid Kunyansky, Oraevsky A A, Stewart A M, Vladimirov V S   +17 more
core   +1 more source

Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes

Case Studies in Thermal Engineering
This research examines the behavior of premixed flames within a vertical tube, considering both an open and a closed end configuration. The study utilizes a pilot flame as the ignition source.
Abdullah M.A. Alsharif, Robert Woolley
doaj   +1 more source

A hybrid CFD-neural network framework for the early prediction of longitudinal thermo-acoustic instabilities in hydrogen-fueled gas turbine combustors

Next Energy
This study introduces a hybrid Computational Fluid Dynamics–Neural Network (CFD–NN) framework for real-time prediction of longitudinal thermo-acoustic instabilities in hydrogen-fueled gas turbine combustors—critical for future clean energy systems.
Oyinbonogha Fred Agonga, Norazila Othman, Mohd Fairus Mohd Yasin   +2 more
doaj   +1 more source

Thermoacoustic tomography with detectors on an open curve: an efficient reconstruction algorithm

, 2008
Practical applications of thermoacoustic tomography require numerical inversion of the spherical mean Radon transform with the centers of integration spheres occupying an open surface.
Agranovsky M, Burgholzer P, Colton D, Hristova Y, Kak A C, Kersten H, Kuchment P, Kunyansky L, Kunyansky L, Leonid A Kunyansky, Louis A K, Natterer F, Palamodov V P, Palamodov V P, Paltauf G, Popov D A, Watson G N   +16 more
core   +1 more source