Results 41 to 50 of about 27,437 (306)

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

Acoustic and Large Eddy Simulation studies of azimuthal modes in annular combustion chambers [PDF]

, 2012
The objectives of this paper are the description of azimuthal instability modes found in annular combus- tion chambers using two numerical tools: (1) Large Eddy Simulation (LES) methods and (2) acoustic solv- ers.
Gicquel, Laurent Y.M., Müller, Jens-Dominik, Poinsot, Thierry, Staffelbach, Gabriel, Wolf, Pierre   +4 more
core   +4 more sources

Unravelling the Secret of Sulfur Confinement and High Sulfur Utilization in Hybrid Sulfur‐Carbons

Advanced Materials, EarlyView.
Thermal condensation of inverse vulcanized sulfur‐carbon hybrids enables a bottom‐up sulfur confinement strategy, in which a protective carbon phase is progressively constructed around sulfur species. The resulting carbon nanodomains covalently tether sulfur chains and stabilize radical intermediates. This integrated architecture effectively suppresses
Tim Horner, Enis Oğuzhan Eren, Elif Begüm Yılmaz, Jiyong Kim, Ernesto Scoppola, Alexandros Vasileiadis, Nadezda V. Tarakina, Markus Antonietti, Paolo Giusto, Evgeny Senokos   +9 more
wiley   +1 more source

Flow and Flame Mechanisms for Swirl-Stabilized Combustors

Aerospace
This article reviews the physical and chemical mechanisms associated with unsteady swirl-stabilized partially or fully lean premixed combustion.
Paul Palies
doaj   +1 more source

Investigation by Thermodynamic Properties of Methane Combustion Mechanisms under Harmonic Oscillations in Perfectly Stirred Reactor

Chemical Engineering Transactions, 2017
An analysis about the ability of selected global mechanisms in reproducing the correct dynamic behavior of a combustion reaction is conducted by investigating the behavior of the total entropy production rate in different ideal reactor configurations ...
L. Acampora, F.S. Marra
doaj   +1 more source

Numerical Steady and Transient Evaluation of a Confined Swirl Stabilized Burner

International Journal of Turbomachinery, Propulsion and Power, 2021
Lean premixed combustion technology became state of the art in recent heavy-duty gas turbines and aeroengines. In combustion chambers operating under fuel-lean conditions, unsteady heat release can augment pressure amplitudes, resulting in component ...
Federica Farisco, Luisa Castellanos, Jakob Woisetschläger, Wolfgang Sanz   +3 more
doaj   +1 more source

Numerical Analysis of Solid Rocket Motor Instabilities With AP Composite Propellants [PDF]

, 1999
A non-steady model for the combustion of ammonium perchlorate composite propellants has been developed in order to be incorporated into a comprehensive gasdynamics model of solid rocket motor flow fields.
Beddini, Robert A., Cohen, Norman S., Culick, Fred E. C., Roh, Tae-Seong   +3 more
core  

Large Eddy Simulation of combustion instabilities in a lean partially premixed swirled flame [PDF]

, 2012
This paper investigates one issue related to Large Eddy Simulations (LES) of self- excited combustion instabilities in gas-fueled swirled burners: the effects of incom- plete mixing between the gas injection and the combustion chamber.
Albouze, Angelberger, Benedetta Franzelli, Bilger, Boudier, Colin, Colin, di Mare, Eleonore Riber, Fiorina, Franzelli, Freitag, Galpin, Giauque, Granet, Kaufmann, Laurent Y.M. Gicquel, Lieuwen, Meier, Moureau, Moureau, Poinsot, Poinsot, Roux, Roux, Schmitt, Selle, Selle, Sengissen, Sengissen, Shreekrishna, Sommerer, Thierry Poinsot, Truffin, Westbrook, Williams, Wolf   +36 more
core   +3 more sources

Effect of Atomic Layer Deposition of Ultra‐Thin Oxide on Reactivity and Durability of Perovskite Oxygen Electrodes

Advanced Materials, EarlyView.
This table of contents illustrates that the mechanism for mitigating Sr segregation depends strongly on the chemistry of the coating layer. HfO2 electrostatically stabilizes the surface by lowering the surface oxygen vacancies, which serve as the driving force for Sr migration. On the other hand, Al2O3 and Fe2O3 react with segregated Sr to form Sr‐Al‐O
Jongsu Seo, SungHyun Jeon, Hyunseung Kim, San Kwak, DongHwan Oh, Bonjae Koo, Jinwook Kim, Jeong Hwan Kim, WooChul Jung   +8 more
wiley   +1 more source

Imaging Diagnositics of Combustion Instability in Premixed Swirling Combustion

Proceedings of Global Power & Propulsion Society, 2019
An experimental study on combustion instability is presented with focus on propane-air premixed swirling flames. Swirling flames under self-excited oscillation are studied by imaging of visible light and OH* chemiluminescence filter under several typical conditions.
Yao Yang, Gaofeng Wang, Yuanqi Fang, YIfan Xia, Liang Zhong   +4 more
openaire   +1 more source