Browsing NTNU Open by Author "Indlekofer, Thomas"
Now showing items 1-9 of 9
-
Assessment of the LES-FGM framework for capturing stable and unstable modes in a hydrogen / methane fuelled premixed combustor
Ho, Jen Zen; Jella, Sandeep; Talei, Mohsen; Bourque, Gilles; Indlekofer, Thomas; Dawson, James (Peer reviewed; Journal article, 2023)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 coupled with Flamelet Generated Manifold (FGM) ... -
The dynamic nature of self-excited azimuthal modes in annular combustors
Indlekofer, Thomas (Doctoral theses at NTNU;2021:209, Doctoral thesis, 2021) -
The effect of hydrogen addition on the amplitude and harmonic response of azimuthal instabilities in a pressurized annular combustor
Indlekofer, Thomas; Ahn, Byeonguk; Kwah, Yi Hao; Wiseman, Samuel; Mazur, Marek; Dawson, James; Worth, Nicholas (Peer reviewed; Journal article, 2021)The present work introduces an annular combustion chamber operated at intermediate pressures. The combustor is operated with CH-H blends leading to a variety of azimuthal combustion instabilities. The influence of the ... -
The effect of hydrogen enrichment, flame-flame interaction, confinement, and asymmetry on the acoustic response of a model can combustor
Æsøy, Eirik; Indlekofer, Thomas; Gant, Francesco; Cuquel, Alexis; Bothien, Mirko R.; Dawson, James Richard (Peer reviewed; Journal article, 2022)To maximise power density practical gas turbine combustion systems have several injectors which can lead to complex interactions between flames. However, our knowledge about the effect of flame-flame interactions on the ... -
The Effect of Hydrogen On Non-linear Flame Saturation
Æsøy, Eirik; Indlekofer, Thomas; Bothien, Mirko; Dawson, James (Peer reviewed; Journal article, 2023)We investigate the effect of hydrogen enrichment on the non-linear response and saturation of premixed methane/hydrogen flames submitted to acoustic forcing. The thermal power is kept fixed to preserve the nozzle velocity ... -
Heat release rate response of azimuthal thermoacoustic instabilities in a pressurized annular combustor with methane/hydrogen flames
Ahn, Byeonguk; Indlekofer, Thomas; Dawson, James; Worth, Nicholas (Journal article; Peer reviewed, 2022)In this study, the heat release rate (HRR) response during self-excited azimuthal thermoacoustic instabilities in a pressurized annular combustor is investigated for hydrogen/methane blended flames. The equivalence ratio ... -
Numerical Investigation of Premixed and Non-premixed Ammonia Main Charge Configurations Ignited by a Hydrogen-Fired Prechamber
Indlekofer, Thomas; Haugen, Nils Erland L; Førde, Olav Øyvind; Gruber, Andrea (Peer reviewed; Journal article, 2024)Ammonia-fired reciprocating engines have emerged as a promising technology in the maritime and power generation sector at medium-to-large scale (1–80 MW). The use of “on-the-fly” partial ammonia decomposition to produce a ... -
Self-excited longitudinal and azimuthal modes in a pressurised annular combustor
Mazur, Marek; Kwah, Yi Hao; Indlekofer, Thomas; Dawson, James; Worth, Nicholas (Peer reviewed; Journal article, 2020)A new laboratory scale pressurised annular combustion experiment is introduced and used to generate selfexcited longitudinal and azimuthal instabilities. The experiments are operated at mean pressuresranging from approximately ... -
Transient Thermo-Acoustic Responses of Methane/Hydrogen Flames in a Pressurized Annular Combustor
Ahn, Byeonguk; Indlekofer, Thomas; Dawson, James; Worth, Nicholas (Peer reviewed; Journal article, 2022)The present article experimentally investigates the triggering and transient growth of azimuthal instabilities in a pressurized laboratory-scale annular combustor featuring 12 methane/hydrogen flames, as the equivalence ...