Results 51 to 60 of about 787,947 (227)

Offline reinforcement learning for mitigating thermoacoustic instabilities in a laminar premixed flame

Applications in Energy and Combustion Science
Thermoacoustic instabilities pose a significant challenge in combustion applications, leading to potential damage to rocket engines and gas turbines. Among various mitigation strategies, active control has been explored as a mean to decouple acoustics ...
Juan Camilo Giraldo Delgado, Qi Wang, S. Mani Sarathy   +2 more
doaj   +1 more source

Application of linear hydrodynamic stability analysis to reacting swirling combustor flows

Journal of Fluid Science and Technology, 2014
This paper presents recent research activities on coherent structures in combustor flows employing linear hydrodynamic stability theory. Large-scale coherent structures play an important role in swirling combustor flows.
Christian Oliver PASCHEREIT, Steffen TERHAAR, Bernhard ĆOSIĆ, Kilian OBERLEITHNER   +3 more
doaj   +1 more source

Bifurcation Dodge: Avoidance of a Thermoacoustic Instability under Transient Operation

, 2018
Varying one of the governing parameters of a dynamical system may lead to a critical transition, where the new stable state is undesirable. In some cases, there is only a limited range of the bifurcation parameter that corresponds to that unwanted ...
Bonciolini, Giacomo, Noiray, Nicolas
core   +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

Instabilities of intrinsic thermoacoustic modes in a thermoacoustic waveguide with anechoic terminations

Physical Review B, 2022
15 pages, 8 ...
Haitian Hao, Fabio Semperlotti
openaire   +2 more sources

Impact of precessing vortex core dynamics on the thermoacoustic instabilities in a swirl-stabilized combustor [PDF]

Journal of Fluid Mechanics, 2020
Global instabilities in swirling flows can significantly alter the flame and flow dynamics of swirl-stabilized flames, such as those in modern gas turbine engines.
Ashwini Karmarkar, Saarthak Gupta, I. Boxx, S. Hemchandra, J. O’Connor   +4 more
semanticscholar   +1 more source

Numerical optimizing noise damping performances of Helmholtz resonators with a rigid baffle implemented at neck in presence of a grazing flow

Journal of Low Frequency Noise, Vibration and Active Control, 2022
As an applicable noise attenuator, Helmholtz resonator is mainly used to dampen acoustic noise at low- and medium-frequency ranges. It is typically implemented in combustion-engines and gas turbines to dampen thermoacoustic instabilities. However, it has
Weiwei Wu, Yiheng Guan
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

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

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