Linear flow analysis inspired by mathematical methods from quantum mechanics

L Magri, PJ Schmid, JP Moeck - Annual Review of Fluid …, 2023 - annualreviews.org
Since its birth in the 1920s, quantum mechanics has motivated and advanced the analysis of
linear operators. In this effort, it significantly contributed to the development of sophisticated …

[HTML][HTML] The effect of hydrogen addition on the amplitude and harmonic response of azimuthal instabilities in a pressurized annular combustor

T Indlekofer, B Ahn, YH Kwah, S Wiseman… - Combustion and …, 2021 - Elsevier
The present work introduces an annular combustion chamber operated at intermediate
pressures. The combustor is operated with CH 4-H 2 blends leading to a variety of azimuthal …

[HTML][HTML] Heat release rate response of azimuthal thermoacoustic instabilities in a pressurized annular combustor with methane/hydrogen flames

B Ahn, T Indlekofer, JR Dawson, NA Worth - Combustion and Flame, 2022 - Elsevier
In this study, the heat release rate (HRR) response during self-excited azimuthal
thermoacoustic instabilities in a pressurized annular combustor is investigated for …

Experimental study on self-excited thermoacoustic instabilities and intermittent switching of azimuthal and longitudinal modes in an annular combustor

Y Fang, Y Yang, K Hu, G Wang, J Li, Y Zheng - Physics of Fluids, 2021 - pubs.aip.org
For annular combustors, the interactions between different modal structures (longitudinal,
azimuthal spinning, standing, and slanted) remain a challenge in ongoing studies of …

Impact of spray dynamics on combustion instabilities investigated by changing the atomizer recess in a swirl combustor

PR Soundararajan, D Durox, A Renaud… - Combustion and Flame, 2023 - Elsevier
The present article is aimed at identifying the impact of spray-wall interaction on combustion
instabilities. This is achieved by systematically modifying the liquid fuel atomizer location …

Assessment of the LES-FGM framework for capturing stable and unstable modes in a hydrogen/methane fuelled premixed combustor

JZ Ho, S Jella, M Talei, G Bourque, T Indlekofer… - Combustion and …, 2023 - Elsevier
The main objective of this paper is to assess the capability of compressible Large Eddy
Simulations (LES) to capture azimuthal combustion instability. The thickened flame model …

[HTML][HTML] Azimuthal flame response and symmetry breaking in a forced annular combustor

HT Nygård, G Ghirardo, NA Worth - Combustion and Flame, 2021 - Elsevier
In the current study azimuthal forcing of an annular combustor with swirling flames has been
performed to present for the first time the Heat Release Rate (HRR) response to all possible …

Longitudinal and azimuthal thermoacoustic modes in a pressurized annular combustor with bluff-body-stabilized methane-hydrogen flames

B Ahn, HT Nygård, NA Worth, Z Yang, LKB Li - Physical Review Fluids, 2024 - APS
In this experimental study on a methane-hydrogen fired laboratory-scale pressurized
annular combustor, various steady and transient operating conditions were explored. Under …

Analysis of the flame dynamics in methane/hydrogen fuel blends at elevated pressures

M Casel, A Ghani - Proceedings of the Combustion Institute, 2023 - Elsevier
Abstract We investigate the Flame Transfer Function (FTF) of a lean-premixed, laminar slit
flame numerically. Based on the reference case at atmospheric pressure, we investigate four …

[HTML][HTML] Theoretical model of azimuthal combustion instability subject to non-trivial boundary conditions

QIN Lei, W **aoyu, G Zhang, SUN **aofeng - Chinese Journal of …, 2024 - Elsevier
The problem of evaluating the sensitivity of non-trivial boundary conditions to the onset of
azimuthal combustion instability is a longstanding challenge in the development process of …