Results 51 to 60 of about 3,374 (244)

Excitation of the precessing vortex core by active flow control to suppress thermoacoustic instabilities in swirl flames [PDF]

, 2019
In this study, we apply periodic flow excitation of the precessing vortex core at the centerbody of a swirl-stabilized combustor to investigate the impact of the precessing vortex core on flame shape, flame dynamics, and especially thermoacoustic ...
Lückoff, Finn, Oberleithner, Kilian
core   +1 more source

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

Progress in analytical methods to predict and control azimuthal combustion instability modes in annular chambers [PDF]

, 2016
Longitudinal low-frequency thermoacoustic unstable modes in combustion chambers have been intensively studied experimentally, numerically, and theoretically, leading to significant progress in both understanding and controlling these acoustic modes ...
Bauerheim, Michaël, Nicoud, Franck, Poinsot, Thierry   +2 more
core   +3 more sources

Stabilization of acoustic modes using Helmholtz and Quarter-Wave resonators tuned at exceptional points

, 2018
Acoustic dampers are efficient and cost-effective means for suppressing thermoacoustic instabilities in combustion chambers. However, their design and the choice of their purging air mass flow is a challenging task, when one aims at ensuring ...
Bourquard, Claire, Noiray, Nicolas
core   +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

Energizing Change: Liquid‐Metal‐Enabled Nanogenerators for Smart Textiles

Small Structures, Volume 7, Issue 3, March 2026.
This review highlights how liquid metals (LMs) improve energy‐harvesting smart textiles through flexible, conductive, and stable electrodes, enhancing the performance of piezoelectric and triboelectric nanogenerators. It explores LM chemistry, device innovations, textile compatibility, and future challenges, offering a roadmap for practical ...
Kamyar Shirvanimoghaddam, Peng Wu, Ilhan Ozen, Nauman Ali Choudhry, Minoo Naebe   +4 more
wiley   +1 more source

A Review on Combustion Instability of Hydrogen-Enriched Marine Gas Turbines

Journal of Marine Science and Engineering
Hydrogen is widely regarded as a promising carbon-free alternative fuel. However, the development of low-emission marine gas turbine combustion systems has been hindered by the associated risks of combustion instability, also termed as thermoacoustic ...
Jiaying Cheng, Bin Hu, Zhilin Zeng, Jinhai Fu, Boyang Zhang   +4 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

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