Blar i NTNU Open på forfatter "Dawson, James"
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The inter-scale energy budget in a von Kármán mixing flow
Knutsen, Anna Nina; Baj, Pawel; Lawson, John M; Bodenschatz, Eberhard; Dawson, James; Worth, Nicholas (Peer reviewed; Journal article, 2020)A detailed assessment of the inter-scale energy budget of the turbulent flow in a von Kármán mixing tank has been performed based on two extensive experimental data sets. Measurements were performed at a Taylor microscale ... -
Large eddy simulation of CH4-air and C2H4-air combustion in a model annular gas turbine combustor
Zettervall, Niklas; Worth, Nicholas; Mazur, Marek; Dawson, James; Fureby, Christer (Journal article; Peer reviewed, 2018)Combustion instabilities are one of the major challenges in developing and operating propulsion and power generating gas-turbine engines. More specifically, techniques for managing the increasingly stringent emissions ... -
Large volume scanning laser induced fluorescence measurement of a bluff-body stabilised flame in an annular combustor
Govender, Dirren; Wiseman, Samuel; Dawson, James; Worth, Nicholas (Journal article; Peer reviewed, 2022)This study outlines a variant of three-dimensional OH planar laser-induced fluorescence and its application in characterising a single bluff body stabilised flame inside a 12 burner annular combustor. In this variant of ... -
Near-field response of an axisymmetric jet to transverse acoustic forcing
Hanssen-Bauer, Øyvind Waage (Doctoral theses at NTNU;2020:142, Doctoral thesis, 2020)The overall aim of this thesis was to investigate a transversely forced, round air-jet, with focus on the coherent vortex structures formed in the near-field of the jet. Increased knowledge about the interaction between ... -
The Norwegian CCS Research Centre (NCCS): facilitating industry-driven innovation for fast-track CCS deployment
Brunsvold, Amy; Tangen, Grethe; Størset, Sigmund Østtveit; Dawson, James; Braathen, Alvar; Steenstrup-Duch, Anne; Aarlien, Rune; Mølnvik, Mona J. (Peer reviewed; Journal article, 2020) -
The response of an axisymmetric jet placed at various positions in a standing wave
Æsøy, Eirik; Aguilar, Jose; Worth, Nicholas; Dawson, James (Peer reviewed; Journal article, 2021)The hydrodynamic response of an axisymmetric jet placed at various positions in a standing wave oriented normally to the jet is investigated. At the velocity and pressure nodes the axisymmetric (m=0) and first azimuthal ... -
Scaling and prediction of transfer functions in lean premixed H2/CH4-flames
Æsøy, Eirik; Aguilar, Jose; Wiseman, Samuel; Bothien, Mirko R.; Worth, Nicholas; Dawson, James (Journal article, 2020)Features of the flame transfer function (FTF) are characterized for turbulent, non-swirled, bluff body stabilized “M” flames for different hydrogen and methane blends including pure hydrogen flames. An increase in the ... -
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 ... -
Study of Cuttings Transport Using Water-Based and Oil-Based Drilling Fluids
Sayindla, Sneha (Doctoral theses at NTNU;2018:108, Doctoral thesis, 2018)Cuttings transport is a topic of great interest in the oil and gas drilling industry. Insufficient cuttings transport leads to several expensive problems. Knowledge and selection of the drilling fluids is one of the important ... -
Suppression of self-excited thermoacoustic instabilities by convective-acoustic interference
Æsøy, Eirik; Jankee, Girish Kumarsing; Yadala, Srikar; Worth, Nicholas; Dawson, James (Peer reviewed; Journal article, 2022)In this paper we demonstrate direct suppression of self-excited thermoacoustic instabilities over a range of operating conditions using targeted convective-acoustic interference. Premixed hydrogen enriched methane-air ... -
The response of a round jet to transverse forcing
Måløy, Maria Theresia (Master thesis, 2015)This project was done in two parts. The first part was to investigate the behaviour of a small jet placed in five different positions between the antinode and the node in an acoustic field. This jet was measured with a ... -
Tracking and sizing of particles in the Mie scattering regime using a laser scanning technique
Koothur, Vipin (Doctoral theses at NTNU;2020:219, Doctoral thesis, 2021) -
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 ... -
Vortex dynamics of a jet at the pressure node in a standing wave
Worth, Nicholas; Mistry, Dhiren; Berk, Tim; Dawson, James (Journal article; Peer reviewed, 2020)In this paper we investigate the vortex structure and dynamics formed in the near field of a turbulent axisymmetric jet subjected to transverse acoustic forcing. Full three-dimensional phase-averaged velocity measurements ...