Results 41 to 50 of about 2,929 (210)

The physics and regularities of the neutron-thermoacoustic instability

Ядерна фізика та енергетика, 2018
The physics and regularities of the neutron-thermoacoustic instability (NTAI) in nuclear channels with subcooled nucleate boiling flows are explained. The method for obtaining the characteristic equation of NTAI in a VVER-type reactor is given.
S. N. Pelykh, Huiyu Zhou, O. B. Maksymova   +2 more
doaj   +1 more source

Experimental Investigation of Stochastically Forced Rijke-Type Supercritical Thermoacoustic Systems

Energies, 2023
Intense thermoacoustic oscillations may lead to severe deterioration due to the induced intolerable damage to combustors. A better understanding of unstable behaviors is important to prevent or suppress these oscillations.
Hao Zhang, Yuanhao Wang, Xinyan Li, Geng Chen, Yuze Sun   +4 more
doaj   +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

Photoacoustic Tomography in a Rectangular Reflecting Cavity [PDF]

, 2013
Almost all known image reconstruction algorithms for photoacoustic and thermoacoustic tomography assume that the acoustic waves leave the region of interest after a finite time.
Cox, B. T., Holman, B., Kunyansky, L.
core   +2 more sources

Analytical Equations for Thermoacoustic Instability Sources and Acoustic Radiation from Reacting Turbulence

International Journal of Aerospace Engineering, 2020
We seek to ascertain and understand source terms that drive thermoacoustic instability and acoustic radiation. We present a new theory based on the decomposition of the Navier-Stokes equations coupled with the mass fraction equations.
S. A. E. Miller
doaj   +1 more source

Convective Velocity Perturbations and Excess Gain in Flame Response as a Result of Flame-Flow Feedback

Fluids, 2022
Convective velocity perturbations (CVPs) are known to play an important role in the response of flames to acoustic perturbations and in thermoacoustic combustion instabilities.
Thomas Steinbacher, Wolfgang Polifke
doaj   +1 more source

Thermoacoustic instability - a dynamical system and time domain analysis

, 2014
This study focuses on the Rijke tube problem, which includes features relevant to the modeling of thermoacoustic coupling in reactive flows: a compact acoustic source, an empirical model for the heat source, and nonlinearities.
Chenadec, Vincent Le, Massot, Marc, Richecoeur, Franck, Sayadi, Taraneh, Schmid, Peter   +4 more
core   +3 more sources

Self-Excited Thermoacoustic Instability Behavior of a Hedge Premixed Combustion System with an Asymmetric Air/Fuel Supply or Combustion Condition

Applied Sciences, 2023
Self-excited thermoacoustic instability (SETAI) is an undesirable and dangerous phenomenon in combustion systems. However, its control is difficult, thus greatly limiting the development of combustion technology.
Yongbo Du, Yuanhang Zhang, Xiaojin Li, Jingkun Zhang, Yaodong Da, Yun Jia, Defu Che   +6 more
doaj   +1 more source

Non-linear simulations of combustion instabilities with a quasi-1D Navier-Stokes code

, 2010
As lean premixed combustion systems are more susceptible to combustion instabilities than non-premixed systems, there is an increasing demand for improved numerical design tools that can predict the occurrence of combustion instabilities with high ...
Allam, Annaswamy, Baillot, Bell, Boyer, Candel, Cohen, Culick, Culick, Davies, Disselhorst, Ditaranto, Dowling, Ducruix, Fichera, Fleifil, Keller, Levine, McManus, Nils Erland L. Haugen, Peters, Poinsot, Polifke, Polifke, Prasad, Rayleigh, Schuller, Sigurd Sannan, White, Øyvind Langørgen   +29 more
core   +1 more source

Thermoacoustic Instability in Combustors

Annual Review of Fluid Mechanics
Thermoacoustic instability is a flow instability that arises due to a two-way coupling between acoustic waves and unsteady heat release rate. It can cause damaging, large-amplitude oscillations in the combustors of gas turbines, aeroengines, rocket engines, etc., and the transition to decarbonized fuels is likely to introduce new thermoacoustic ...
Morgans, AS, Yang, D
openaire   +2 more sources