Results 81 to 90 of about 2,865 (193)

Continuous and explosive synchronization transition in turbulent combustors

AIP Advances
Thermoacoustic instabilities in turbulent combustors have disastrous consequences and present notorious challenges in their modeling, prediction, and control.
Samarjeet Singh, Amitesh Roy, Jayesh M. Dhadphale, Swetaprovo Chaudhuri, R. I. Sujith   +4 more
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, Elbau, Peter, Sadiq, Kamran, Scherzer, Otmar   +3 more
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

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

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, Nguyen, Linh V., Nuster, Robert, Zangerl, Gerhard   +3 more
core   +1 more source

Thermoacoustic tomography with variable sound speed [PDF]

, 2009
We study the mathematical model of thermoacoustic tomography in media with a variable speed for a fixed time interval, greater than the diameter of the domain.
Agranovsky M, Duistermaat J J, Finch D, Gunther Uhlmann, Haltmeier M, Hristova Y, Hristova Y, Lasiecka I, Patch S K, Plamen Stefanov, Taylor M E, Trèves F, Trèves F, Xu Y   +13 more
core   +4 more sources

Determining both sound speed and internal source in thermo- and photo-acoustic tomography

, 2015
This paper concerns thermoacoustic tomography and photoacoustic tomography, two couple-physics imaging modalities that attempt to combine the high resolution of ultrasound and the high contrast capabilities of electromagnetic waves.
Liu, Hongyu, Uhlmann, Gunther
core   +2 more sources

On the reflection and transmission of circumferential waves through nozzles [PDF]

, 2015
This paper presents a mathematical model for predicting the propagation of circumferential waves (acoustic, entropy and vorticity waves) through an annular nozzle.
Duran, I, Morgans, AS
core   +2 more sources

Detection of Precursors of Thermoacoustic Instability in a Swirled Combustor Using Chaotic Analysis and Deep Learning Models

Aerospace
This 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, Zhiyu Wang, Hongwu Zhou, Wei Cao, Zhan Zhong, Weidong Huang, Wansheng Nie   +6 more
doaj   +1 more source

Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers [PDF]

, 2012
Great prominence is put on the design of aeronautical gas turbines due to increasingly stringent regulations and the need to tackle rising fuel prices.
A Giauque, A Roux, A Roux, A Sengissen, C Fureby, C Martin, F Nicoud, G Boudier, G Boudier, G Boudier, G Staffelbach, Gabriel Staffelbach, H Pitsch, J Smagorinsky, JM Senoner, L Benoit, L Selle, L Selle, Laurent Y. M. Gicquel, M Boileau, N Gourdain, O Colin, O Colin, P Moin, P Sagaut, P Schmitt, P Wolf, Pierre Wolf, Ramesh Balakrishnan, S Ghosal, S Mendez, S Roux, T Poinsot, T Poinsot, Thierry Poinsot, V Moureau, Y Huang   +36 more
core   +4 more sources